tender for electrical power upgrade at · pdf file3.22 protection of works .....36 3.23...

TENDER FOR ELECTRICAL POWER UPGRADE AT KENYA

COMMERCIAL BANK’S KENCOM HOUSE BUILDING

NAIROBI

Release Date Friday 13th March 2015

Return Date: Friday 27th March 2015

2

Table of Contents Table of Contents ....................................................................................................................... 2 1 INSTRUCTIONS TO BIDDERS ...................................................................................... 6

1.1 Introduction ................................................................................................................ 6 1.2 Preliminaries and conditions of contract .................................................................... 6 1.3 Format of tender response and other information for contractors ........................... 19

2 COMMERCIAL TERMS AND CONDITIONS ............................................................. 23 2.1 Bank reserves the right to the following .................................................................. 23 2.2 Force Majeure .......................................................................................................... 24 2.3 Termination for Insolvency ...................................................................................... 24 2.4 Termination for Convenience .................................................................................. 24

2.5 Performance Guarantee ............................................................................................ 24 2.6 Time of completion & penalty clause ...................................................................... 25 2.7 Injury to persons, property & Owner’s Indemnity................................................... 25

2.8 Accidents.................................................................................................................. 25 2.9 Labour laws .............................................................................................................. 25 2.10 Cost of tests .............................................................................................................. 25 2.11 Statutory authority obligations, notices, fees charges .............................................. 25

2.12 Work to be done to the satisfaction of The Bank ..................................................... 26 3 GENERAL SPECIFICATIONS ...................................................................................... 26

3.1 Extent of Electrical Installations .............................................................................. 26 3.2 Program for Electrical Engineering Installations ..................................................... 27 3.3 Drawings accompanying the Tender Documents .................................................... 27

3.4 Contract Working Drawings .................................................................................... 28

3.5 Record Drawings (“As Installed Drawings”) .......................................................... 29 3.6 Data Schedule .......................................................................................................... 29 3.7 Maintenance Manuals .............................................................................................. 30

3.8 Builder's Work and Civil Works .............................................................................. 30 3.9 Commissioning of the Electrical Installation ........................................................... 31

3.10 Regulations and Standards ....................................................................................... 31 3.11 Quality of Materials ................................................................................................. 31

3.12 Workmanship ........................................................................................................... 32 3.13 Setting out of work................................................................................................... 33 3.14 Erection and checking of work ................................................................................ 33

3.15 Site performance and acceptance tests ..................................................................... 33

3.16 Test records .............................................................................................................. 34 3.17 Dust, insect and vermin proofing ............................................................................. 34 3.18 Painting and finishing .............................................................................................. 34

3.19 Labels ....................................................................................................................... 35 3.20 Specialist manufacturers .......................................................................................... 35 3.21 Interference with the existing Works ....................................................................... 36 3.22 Protection of Works ................................................................................................. 36 3.23 Sundries.................................................................................................................... 36

3.24 Schedules of technical data ...................................................................................... 36 3.25 Copies of orders ....................................................................................................... 36 3.26 Inspection and tests at Manufacturer's Works ......................................................... 36

4 TECHNICAL SPECIFICATIONS FOR 11KV METAL CLAD

PROTECTION AND METERINGSWITCHGEAR PANEL...................................... 37 4.1 General specifications .............................................................................................. 37

3

4.2 Working stress and equipment/apparatus design ..................................................... 40 5 BASIC REQUIREMENT FOR ELECTRICAL EQUIPMENT ...................................... 42

5.1 Electrical controls, auxiliaries and power supplies .................................................. 42 5.2 Wiring ...................................................................................................................... 45

5.3 Equipment and switchgear earthing ......................................................................... 47 5.4 Materials and workmanship ..................................................................................... 47 5.5 Protection, cleaning and painting ............................................................................. 48 5.6 Drawings .................................................................................................................. 49 5.7 Manufacture of sample panels ................................................................................. 51

5.8 Operating and maintenance instructions .................................................................. 52 5.9 Testing at place of manufacture ............................................................................... 52 5.10 Software requirement ............................................................................................... 54

5.11 Spare parts ................................................................................................................ 54 5.12 Accessories for the switchgear panels ..................................................................... 55 5.13 Packing ..................................................................................................................... 55 5.14 Delivery.................................................................................................................... 55

6 DETAILED TECHNICAL SPECIFICATIONS FOR 11 KV METAL CLAD INDOOR

PROTECTION & METERING SWITCHGEAR PANELS.................................................... 56 6.1 Scope ........................................................................................................................ 56 6.2 References ................................................................................................................ 56

6.3 Construction of each panel....................................................................................... 56 6.4 Circuit breakers ........................................................................................................ 61 6.5 Current transformers ................................................................................................ 63

6.6 Voltage transformers ................................................................................................ 64

6.7 Protection relays....................................................................................................... 65 6.8 Indication and instruments ....................................................................................... 66 6.9 Power cable termination .......................................................................................... 66

6.10 Scope of supply for 11kv protection & metering switchgear panels ....................... 66 6.11 Labelling of the switchgear panels .......................................................................... 66

6.12 Ratings of switchgear panel equipment ................................................................... 67 6.13 Factory acceptance tests (FATs) .............................................................................. 68 6.14 Current Transformer ................................................................................................ 69 6.15 Voltage Transformer ................................................................................................ 69

6.16 Protection Relay Tests ............................................................................................. 70 6.17 Training at the manufacturer’s place ....................................................................... 70 6.18 17.5 kV Circuit Breaker. .......................................................................................... 70

6.19 Training at site ......................................................................................................... 71

6.20 Feeder Protection and Control relay ........................................................................ 71 7 PROTECTION RELAYS, CONTROLS AND MEASURING DEVICES

REQUIREMENTS FOR SWITCHGEAR PANELS .............................................................. 71

7.1 General requirements ............................................................................................... 71 7.2 Bill of materials........................................................................................................ 72 7.3 Protection & metering switchgear panel requirements ............................................ 72 7.4 Protection relays....................................................................................................... 72 7.5 Detailed specifications for relays, measuring and indicating instruments, control

switches and other accessories ............................................................................................. 74 7.6 LV switchboard specifications ................................................................................. 78 7.7 Specifications for distribution transformer – Ground mounted three phase

transformer (2000KVA)....................................................................................................... 81 7.8 Test and factory inspection ...................................................................................... 87

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7.9 Technical documentation ......................................................................................... 87 8 TECHNICAL SCHEDULE - BIDDERS TO COMPLETE ............................................ 88

8.1 Tender form for Switchboard and associated switchgear ........................................ 88 8.2 Tender form for 11000/433V Transformer (Particulars of equipment) ................... 99

8.3 Factory inspection .................................................................................................. 102 8.4 Criteria for passing technical evaluation................................................................ 102

9 GENERAL CONDITIONS OF CONTRACT ............................................................... 103 9.1 Award of Contract.................................................................................................. 103 9.2 Application of General Conditions of Contract ..................................................... 103

10 APPENDIX .................................................................................................................... 108 APPENDIX A – FORM OF TENDER .............................................................................. 108 APPENDIX B – CERTIFICATE OF COMPLIANCE ..................................................... 109

APPENDIX C – LETTER TO KCB ON THE CONTRACTOR’S LETTERHEAD ....... 110 APPENDIX D – PERFORMANCE SECURITY FORM ................................................. 111 APPENDIX E – BIDDER’S DETAILS ............................................................................ 112 APPENDIX F – BILL OF QUANTITIES ......................................................................... 118

5

TENDER FOR ELECTRICAL POWER UPGRADE AT KENYA COMMERCIAL BANK’S

KENCOM HOUSE BUILDING NAIROBI

ISSUE OF RFP DOCUMENT to prospective bidders

This form is to be completed by persons expressing interest on the above

tender, this page is to be completed and faxed immediately to fax number

+254 20 240977 or a scan copy e-mailed to [email protected]. Firms

that do not register their interest in this manner may not be sent the RFP

addenda should any arise.

Name of Person: ______________________________________

Organization Name: __________________________________

Address: _____________________________________________

Tel No: _______________________________________

Fax No:_______________________________________

Email Address:_______________________________________

Signature:___________________________________________

Date:_______________________________________________

6

1 INSTRUCTIONS TO BIDDERS

1.1 Introduction

The KCB Limited (hereinafter referred to as “the Bank’’) is a leading

commercial bank in the Eastern Africa region, renowned for its diversity and

growth potential. The bank has subsidiary companies - KCB Tanzania limited

based in Tanzania, KCB Uganda based in Uganda, KCB Rwanda based in

Rwanda, KCB Burundi based in Burundi, KCB Sudan based in Sudan.

The Bank has a rich history dating back to 1896 and is the largest commercial

bank in the region with over 300 branches in Kenya, Tanzania, Uganda,

Rwanda, Burundi and Southern Sudan.

The Bank’s vision is to be the Preferred Financial Solutions Provider in Africa

with a Global Reach.

The Bank is in the process of upgrading its existing electrical power distribution

system at its Kencom House Headquarters to meet the present and future

needs of the Bank.

In the recent past, the Bank has undergone tremendous changes in its

operations with the adoption of a one branch network. This has necessitated

consolidation and computerisation of banking services.

The automation and computerisation has resulted in installation of additional

equipment to support the operations. This has resulted in high power

demands straining the current installed capacity. The load is expected to

increase as the Bank operations become even more sophisticated.

This has therefore necessitated the need to upgrade the existing electrical

power distribution system to meet the needs of the ever increasing electrical

power demand.

This document therefore constitutes the formal TENDER FOR ELECTRICAL

POWER UPGRADE AT KENYA COMMERCIAL BANK’S KENCOM HOUSE BUILDING

NAIROBI and is being availed on an open tender basis to Contractors

interested in submitting bids.

1.2 Preliminaries and conditions of contract

ITEM KSHS. CTS.

1.01

Examination of Tender Documents

The tenderer is required to check the pages of

these documents and should he find any missing, or

indistinct, he must inform the Consulting Engineers at

once and have the same rectified. The tenderers

shall ensure that all ambiguities, doubts or obscure

points or details are clarified with the Consulting

Engineers before submission of his tender, as no

claims for alleged deficiencies in information given

shall be considered after the tender return date.

7

1.02

Discrepancies

The Contractor shall include all work either shown

on the Contract Drawings, Specification or detailed

in the Schedules. No claim for extra cost shall be

considered for work which has been shown on the

Drawings, Specification or in the Schedules alone.

1.03 Conditions of Contract Agreement

The Contractor shall be required to enter into a

Contract with the Client or his Representative.

The conditions of the Contract between the

Client/Client’s Representative and the Contractor

as hereinafter defined shall be the latest edition of

the Agreement and Schedule of Conditions of

Building Contract published by the Kenya

Association of Building and Civil Engineering

Contractors with sanction of the Architectural

Association of Kenya and The Kenya Institute of

Engineers as particularly modified and amended

hereinafter. For the purpose of this Contract the

Agreement and Schedule of Conditions and any

such modifications and amendments shall be read

and construed together. In the event of

discrepancy the modifications and amendment

shall prevail.

1.04 Definition

The following terms and expressions used in the

Contract Documents shall have the following

meaning:-

The Employer/ shall Mean

Kenya Commercial Bank

P.O. Box 48400 00100,

Nairobi

Electrical consultant/ shall Mean

Aberdare Engineering

P.O. Box 73604-00200

Nairobi

8

Total carried to collection page

A/1

ITEM KSHS. CTS.

The Builder shall mean The firm(if any)

appointed

to carry out the building works.

The Contractor Shall mean the person or persons,

partnership,

firm or company whose tender

for the Contract Works has been

accepted, and who has signed

the Contract and shall include his

or their heirs, executors,

administrators, assigns, successors

and duly appointed

representatives

Works: The expression “Work” or “Works”

shall mean the material and

plant to be provided and labours

to be performed by the

Contractor in fulfillment of the

terms of this Specification and of

any Contract made for the

purpose between himself and

the Client.

Contract

Drawings: shall mean those drawings listed

in schedules or referred to in and

forming part of this Specification.

Working

Drawings: shall mean those drawings which

are to be prepared by the

Contractor as described in this

Specification.

Record

Drawings: shall mean those drawings which

are to be prepared by the

Contractor after completion of

work “As installed” or other

records of this work as described

in this Specification.

9

Prime Cost

Provisional

Sums The term “Prime Cost” (“P.C.

Sum) and Provisional Sums

wherever used in the Bills of

Quantities shall have the

meaning stated in Section A/3)

of the Standard Method of

Measurement mentioned in

Condition No. 1.13 of section 1.2

– preliminaries and conditions of

contract.

Total carried forward to collection page

A/2

ITEM KSHS. CTS.

1.05 Site Location and Site Visit

The proposed site is situated along Kencom House,

Moi Avenue Nairobi.

The Tenderer is recommended to visit the site, and

shall be deemed to have satisfied himself with

regard to access, possible conditions, the risk of

injury or damage to property on or adjacent to the

site, and the conditions under which the sub-

Contract Works shall have to be carried out.

1.06 Duration of Contract

The Contractor shall be required to indicate the time

he anticipates to complete the works in Appendix E

item no. 43. The Contractor is requested to note that

time is of essence in this project and failure to

comply with his indicated Contract Period shall

attract penalties.

1.07 Scope of Contract Works

The Contractor shall supply, deliver, fix, test,

commission and hand over in satisfactory working

order the complete installation detailed in the

Schedules and accompanying drawings. The

Contractor shall supply all accessories, whether

described in this Specification or not, essential to the

completion of the work to the satisfaction of the

10

Engineer and in accordance with all local and

Government Regulations.

1.08 Extent of the Contractor’s Duties

At the commencement of the work, the Contractor

shall investigate and report to the Engineer if all

materials and equipment to be used in the work and

not specified as supplied by others are available

locally. If these materials and equipment are not

available locally, the Contractor shall at this stage

place orders for the materials in question and copy

the orders to the Engineer. Failure to do so shall in

no way relieve the Contractor from supplying the

specified materials and equipment in time.

Materials supplied by others for installation and /or

connection by the Contractor shall be carefully

examined in the presence of the supplier before

installation and connection. Any defects noted shall

immediately be reported to the Engineer.

The Contractor shall mark accurately on one set of

drawings and indicate all alterations and/or

modifications carried out to the designed system

during the construction period. This information must

be made available on site for inspection by the

Engineer.

1.09

Execution of the Works

The works shall be carried out strictly in accordance

with:-

(a) All relevant British Standard Specification and

Codes of Practice (hereinafter referred to as

B.S. and C.P. respectively), I.E.E. Regulations,

Electric Power Act and By-Laws of Kenya

Power.

(b) By-Laws of the Local Authority.

(c) This Specification.

(d) The Client’s Instructions.

(e) The Engineer’s Instructions.


A/3

11

ITEM KSHS. CTS.

1.10 Validity of Tender

The tender shall remain valid for acceptance within

90 days from the final date of submission of the

tender, and this has to be confirmed by signing the

Tender Bond contained in this Specification. The

Tenderer shall comply in all respects to the provision

of the Tender Bond. The Tenderer shall be exempt

from this Bond if the tender was previously withdrawn

in writing to the Employer before the official tender

opening.

1.11 Firm Price Contract

This quotation is a firm price contract and the

Contractor must allow in his quote for any increase

in the cost of labour and/or material during the

duration of the contract.

1.12 Variations

No alteration to the Contract Works shall be carried

out, until receipt by the Contractor of written

instructions from the Engineer.

Any variation from the Contract Price in respect of

any extra work, alterations or omissions requested or

sanctioned by the Client or Engineer shall be agreed

and confirmed in writing at the time such variations

are decided to assess the value of such variations.

No allowance shall be made for loss of profit on

omitted works.

Where the Client required additional work to be

performed, the Contractor, if he considers it

necessary, will give notice within 7 days to the

Engineer of the length of time he (the Sub-

/Contractor) requires over and above that allotted

for completion of the Contract. If the Contractor

fails to give such notice he will be deemed

responsible for all claims arising from delay

occasioned by reason of such extension of time.

1.13 Prime Cost and Provisional Sums

Prime costs (P.C. sums) where included in the tender

form are to cover the cost of, or are to be paid by

the Contractor to merchants or others for articles or

12

materials to be supplied or work to be done, as

specifically directed by the Engineer. Provisional

sums are included to provide for definite work that

cannot be accurately priced at the time of the

tender. If instructed to do so, the Contractor shall

appoint a Specialist Sub-Contractor nominated by

the Consulting Engineer, to supply and/or install any

equipment covered by Prime Cost or Provisional

Sum. The work covered by Prime Costs and

Provisional Sums may or may not be carried out at

the discretion of the Consulting Engineers.

The whole or any part of these sums unexpected by

the Contractor shall be deducted from the value of

the Contract price when drawing up the final

account.

1.14 Contingency Sum

The Contingency Sum shall be used at the discretion

of the Engineer and only with written instructions to

the Contractor.

The whole or any part of this unutilized sum and any

other omitted item in the Bills of quantities shall be

deducted from the value of the Contract price

when calculating the final account.

Total carried to collection Page

A/4

ITE

M

KSHS. CTS.

1.15

Bond

All tenderers will submit the name of an approved

surety who will be willing to be bound to the Client in

the amount equal to 10% of the Contract amount.

1.16 Government Legislation and Regulations

The Contractor’s attention is called to the provision

of the Factory Act 1972 and subsequent

amendments and revisions, and allowance must be

made in his tender for compliance therewith, in so

far as they are applicable. The Contractor must also

make himself acquainted with the current legislation

and any Government Regulations regarding the

movement, housing, security and control of labour,

13

labour camps, passes for transport, etc.

The Contractor shall allow for providing holiday and

transport for work people, and for complying with

Legislation Regulations and Union Agreements.

1.17 Import Duty and Value Added Tax

The Contractor shall be required to pay full Import

Duty and Value Added Tax on all items of

equipment, fittings and plant, whether imported or

locally manufactured items.

All rates entered in the Bills of Quantities shall exclude

V.A.T. There shall be a component of V.A.T on the

summary page.

1.18 Insurance Company Fees

Attention is drawn to the Tenderers to allow for all

necessary fees, where known, that may be payable

in respect of any fees imposed by Insurance

Companies or Statutory Authorities for testing or

inspection. No allowance shall be made to the

Contractor with respect to fees should these have

been omitted by the Tenderer due to his negligence

in this respect.

1.19 Provision of Services

(a) The Main-Contractor shall make available to

the Sub-Contractor the provision of water,

lighting and power. All those services utilized

shall be paid for by the Main-Contractor. The

Sub-Contractor shall however allow for

additional connections/extensions required

for his purposes.

(b) In the absence of a Main Contractor, the

Electrical Contractor shall make available all

the facilities necessary to complete the

installation. These include provision of

ladders, scaffolding, cable extensions etc. It

shall be deemed that the Contractor will

have catered for the cost of such facilities in

his tender.

14


A/5

ITE

M

KSHS. CTS.

1.20 Storage of Materials on Site

The Contractor may be allocated areas for the

purpose of storing materials and equipment on site

when such areas are available. In such a case he

would be responsible for ensuring the given area is

waterproof. If such an area is not available, the

Contractor will be responsible for providing his own

sheds and lock-up facilities.

The Contractor shall when called upon by the Client

or Engineer move any part of his plant or materials

elsewhere not withstanding his having previously

obtained permission for it to be temporarily

accommodated at any location.

1.21 Suppliers

The Contractor shall submit the names of any

approved suppliers for the materials to be

incorporated, to the Engineer for approval. The

information regarding the names of supply will not

be changed without prior approval.

1.22 Samples and Materials Generally

The Contractor shall, when required, provide for

approval at no extra cost, samples of all materials to

be incorporated in the works. Such samples when

approved shall be retained by the Engineer and

shall form the standard for all such materials

incorporated.

No materials of any description shall be used or

delivered to site without prior sanction by the

Engineer, and any materials condemned as unfit for

use in the works, must be removed immediately from

the site without any recompense to the Contractor.

All materials for the permanent works shall be new

and shall, where no other specification is given, be

of first class quality and suitable for the purpose

intended.

15

Where trade names or manufacturer’s catalogue

numbers are mentioned the reference is intended as

a guide to the type of article or quality of material

required. The Contractor may use any article or

material equal in type or quality to those described

subject to prior approval by the Engineer. The

Contractor shall be responsible for proving

equivalence in quality.

1.23

Working Drawings

The Contractor shall prepare working drawings in

such details not only that the Contract Works can be

executed on site but also that the Engineer can

approve the Contractor’s proposals, detailed

designs and intentions in the execution of the

Contract Works.

1.24

Faulty Works

The whole of the works shall be carried out to the

satisfaction of the Engineer who shall have the right

to reject any materials or workmanship which is in his

opinion unsatisfactory. The Contractor shall replace

such materials or rectify such bad workmanship

forthwith, at his own expense.

1.25 Test Certificates

The Contractor shall provide the Engineer with three

copies of all test reports or certificates that are, or

may be, required by this Specification.


A/6

ITEM KSHS. CTS.

1.26 Supervision

During the progress of the works, the Contractor shall

provide and keep constantly available for

consultation on site an experienced English-speaking

Supervisor and reasonable office facilities,

attendance, etc. for this supervisor. In addition

during the whole of the time works are under

construction, the Contractor shall maintain on site an

experienced foreman or charge hand and an

adequate number of fitters etc, for the work covered

by this staff shall not be reduced without the prior

written approval of the Engineer.

16

Any instructions given to the supervisor on site shall be

deemed to have been given to the Contractor.

One copy of this Specification and one copy of each

of the contract drawings (latest issue) must be

retained on site at all times, and be made available

for reference by the Engineer or Sub-Contractor.

1.27 Fair Wages

The Contractor shall comply in all respects with

Clause 30, “Wages and Conditions” contained in the

Agreement and Schedules of Conditions of Building

Contract (1972 edition).

1.28 Payments

Payments shall be made through certificates to the

Client. No payment will become due until materials

are delivered to the site. Payments shall be

implemented in phases with an earlier indication of

anticipated cash projection to enable the Client plan

a cash flow.

1.29 Final Account

On completion of the work the Contractor shall

agree with the Engineer the value of any variations

outstanding and as soon as possible thereafter submit

to the Architect and Engineer his final statement of

account showing the total sum claimed sub-divided

as follows:-

Statement A detailing the tender amounts less the

Prime Cost and Provisional Sums,

included therein.

Statement B detailing all the variations orders issued

on the Contract.

Statement C summarizing statement A and B and

giving the net grand total due to the

Contractor for execution of the Contract.

1.30 Damages for Delays

Liquidated and ascertained damages as stated in

the Contract Agreement shall be claimed against

the Contractor for any unauthorized delay in

completion. The Contractor shall be held liable for

17

the whole or a portion of these damages should he

cause delay in completion of the works.

1.31 Clearing of Site

The Contractor shall clear all his debris and surplus

rubbish material off the site. He shall, at his own

expense remove and clear away all plant,

equipment, rubbish and unused materials, and shall

leave the whole of the works in clean and tidy state,

to the satisfaction of the Engineer.

Total Carried to collection page

A/7

ITEM KSHS. CTS.

1.32 Guarantee

The whole of the Contract Works shall be guaranteed

for a period of six months from the date of the

Engineer’s certificate of completion and under such

guarantee the Contractor shall remedy at his own

expense all defects in materials, and apparatus due

to faulty design, construction or workmanship which

may develop in that period.

The Contractor shall also make good any damage

caused to other works, finishes, equipment etc., due

to above defects during this period.

This clause shall not in any way invalidate any

manufacturer’s guarantee on equipment which may

extend for periods longer than the Architect’s

Certificate of completion.

1.33 “As Installed” Drawings

At the completion of the Sub-Contract the

Contractor shall supply the Engineer with:

(i)1 set of transparent originals

(ii)3 sets of prints

Both shall show the complete installations and shall

include the location of all apparatus, conduit runs,

and ductwork.

1.34 Maintenance Manuals and Certificates of Guarantee

Two fully comprehensive maintenance and

18

operation instruction manuals shall be provided by

the Contractor including any manufacturer’s

certificate of guarantee. These documents shall be

handed to the Engineer before the final payment is

made.

1.35 Measured Work

All “Provisional” and other work liable to adjustment

or costing at “measured rates” under this contract or

subsequent additions or modifications, shall be left

uncovered for a reasonable time to allow the

necessary measurements to be taken by the

Engineer. Immediately the work is ready for

measurement, the Contractor shall give notice to the

Engineer.

1.36 Facilities for Inspection

The Engineer shall be allowed all facilities for

inspecting materials and workshop on the site during

the execution of the contract and a similar

reservation for inspection at the maker’s works shall

be included in all orders for specially manufactured

equipment issued by the Contractor. In such cases

notice shall be given to the Engineer that material

has been manufactured and is ready for inspection

and testing so that this may be carried out before the

material is packed for Shipment.

1.37 Setting Out

The Contractor shall set out the Works in accordance

with the dimensions and levels shown on the

drawings and shall be responsible for the correctness

of all dimensions and levels so set out by him and will

be required to amend all errors arising from

inaccurate setting out at his own cost and expenses.

In the event any error or discrepancy must be

reported by the Contractor to the Engineer for his

immediate consideration.

Total carried forward to collection page

A/8

ITEM KSHS CTS

1.38 1 Builder’s Work

All necessary chasing, cutting away and making

good will be done by the Main Contractor but the

19

Contractor shall mark out in advance and shall be

responsible for accuracy of sizes and position of all

holes and chases required.

1 Total carried forward to collection

page

A/9

ITEM DESCRIPTION KSHS. CTS.

PRELIMINARIES AND CONDITIONS OF CONTRACT

COLLECTION

1. Brought forward from Page No.A1









TOTAL CARRIED FORWARD TO SUMMARY PAGE

450,000

00

1.3 Format of tender response and other information for contractors

Proposals from Contractors shall be submitted in two distinct parts, namely

technical proposal and financial proposal and these shall be in two separate

sealed envelopes, both of which shall then be placed in a common sealed

envelope marked

“TENDER FOR ELECTRICAL POWER UPGRADE AT KENYA COMMERCIAL BANK’S

KENCOM HOUSE BUILDING NAIROBI”

The two separate inner envelopes shall be clearly marked “Technical

Proposal”, and “Financial Proposal”, respectively, and shall bear the name of

the Contractor.

The bid documents shall be addressed as below and dropped at the tender

box on 5th Floor, Kencom House, Wing B on 27th March 2015, 3.00 pm or

before the closing date.

20

Note: KCB shall not receive any tenders by facsimile or electronic mail courier

and / or post.

Head of Procurement


5th Floor Kencom House

P.O. Box 48400, 00100

Nairobi, Kenya

1.3.1 Proposal evaluation & information for Contractors

A two-stage procedure will be adopted by the Bank for evaluating the

proposals, with the technical evaluation of all proposals received in time

being completed prior to any financial proposal being evaluated. Proposals

will be evaluated based on the following general areas:

(a) Firm’s capacity and relevant experience

(b) Firm’s statutory and regulatory compliance

(c) The specific responses to requirements outlined in the tender

document

(d) Overall value proposition as outlined in the tender document

Contractors are requested to hold their proposals valid for ninety (90) days

from the closing date of submission. The Bank will make its best efforts to arrive

at a decision within this period.

Assuming that the Contract can be satisfactorily concluded the winning

bidder shall be expected to commence the assignment within two (2) weeks

after the final agreement is reached.

The Bank reserves the right to accept or to reject any bid, and to annul the

bidding process and reject all bids at any time prior to the award of the

contract, without thereby incurring any liability to any Contractor or any

obligation to inform the Contractor of the grounds for its action.

1.3.2 Documents Constituting the Tender

The Tender submitted by the Tenderer shall consist but not limited to the

following components:

1.3.2.1 Technical proposal

a) Copy of tender document, single line and layout diagrams

b) Technical schedules (section 8) duly filled and requested attachments

provided

c) Bidder’s details (Appendix E) dully filled and requested attachments

provided

d) Certificate of compliance (Appendix B) and letter to KCB on the

contractor’s letter head (Appendix C) duly filled and signed

21

e) Any information or other materials required to be completed and

submitted by Tenderers, as specified in the Tender Document

1.3.2.2 Financial proposal

a) Form of Tender (Appendix A) duly filled and signed

b) Priced Bill of Quantities (Appendix F) – initial every page

1.3.3 Cost of bidding

The Contractor shall bear all costs associated with the preparation and

submission of its bid, and the Bank will in no case be held responsible or liable

for those costs, regardless of the conduct or outcome of the bidding process.

1.3.4 Clarification of bidding document

All correspondence related to the contract shall be made in English. Any

clarification sought by the Contractor in respect of the project shall be

addressed in writing to the Head of Procurement at least five working (5)

days before the deadline for submission of bids.

The queries and replies thereto shall then be circulated in the form of an

addendum to all other prospective Contractors (without divulging the name

of the Contractor raising the queries), which shall be acknowledged in writing

by the prospective Contractors.

Enquiries for clarifications shall be sent by e-mail to [email protected]

1.3.5 Amendment of bidding document

At any time prior to the deadline for submission of bids, The Bank, for any

reason, whether at its own initiative or in response to a clarification requested

by a prospective Contractor, may modify the bidding document by

amendment.

All prospective Contractors that have received the bidding documents will

be notified of the amendment in writing, and it will be binding on them. It is

therefore important that Contractors give the correct details at the time of

collecting/receiving the bid document.

To allow prospective Contractors reasonable time to take any amendments

into account in preparing their bids, The Bank may at its sole discretion

extend the deadline for the submission of bids based on the nature of the

amendments.

1.3.6 Deadline for submission of bids

Bids shall be addressed to The Head of Procurement and sent for receipt on

or before Friday 27th March, 2015 3PM.

Bids received after the above-specified date and time shall not be

considered.

Any bid received by the Bank after this deadline will be rejected.

mailto:[email protected]

22

1.3.7 Cost structure and non-escalation

The Contractor shall, in their offer, detail the proposed costs.

No price escalation under this contract shall be allowed.

1.3.8 Taxes and incidental costs

The prices and rates in the financial offer will be deemed to be inclusive of all

taxes and any other incidental costs.

1.3.9 Responsiveness of proposals

The responsiveness of the proposals to the requirements of this tender will be

determined. A responsive proposal is deemed to contain all documents or

information specifically called for in this tender document. A bid determined

not responsive will be rejected by The Bank and may not subsequently be

made responsive by the Contractor by correction of the non-conforming

item(s).

1.3.10 Currency for pricing of tender

All bids in response to this tender shall be expressed in Kenya Shillings.

Expressions in other currencies shall not be permitted.

1.3.11 Correction of errors

Bids determined to be substantially responsive will be checked by The Bank

for any arithmetical errors and due diligence will be done to correct the errors

and final costs adjusted accordingly. If the Successful Bidder does not accept

the correction of the errors, its Bid will be rejected, and its Bid security may be

forfeited.

1.3.12 Evaluation and comparison of bids

Technical proposals will be evaluated prior to the evaluation of the financial

proposals. Financial proposals of firms whose technical proposals are found to

be non-qualifying in whatever respect may be returned unopened.

1.3.13 Clarification of bids

During evaluation of the Bids, The Bank, at its discretion, may ask the Bidder

for clarification of its Bid. The request for clarification and the response shall

be in writing, and no change in the prices or substance of the Bid shall be

sought, offered or permitted.

1.3.14 Confidentiality

The tender contains information proprietary to the Bank. The Bank requires the

recipients of this document to maintain its contents in the same confidence

as their own confidential information and refrain from reproducing it in whole

or in part without the written permission of The Bank

23

The information provided by the bidder/s will be held in confidence and will

be used for the sole purpose of evaluation of bids.

1.3.15 Scope of work

The project includes but not limited to the following key activities;

(a) Installation of an appropriate transformer to meet the present and

future load demands of the Bank and facilitate 11kv utility metering

(b) Installation of medium voltage protection circuit breaker

(c) Installation of a new low voltage distribution board to meet the

present and future load requirements of the Bank

(d) Provision for future installation of additional redundant transformer for

second line from Kenya Power.

(e) Provision of an automatic changeover in the new switchboard for the

existing generators

(f) Disconnection of existing standby generator connection from existing

switchboard and connection to the new switchboard

(g) Installation and commissioning of ventilation/ air condition systems at

the new and existing switch rooms and transformer rooms

(h) Load balancing and redistribution at the existing switchboard

(i) Partitioning of available space to accommodate 11kv KPLC metering,

RMU, medium voltage circuit breaker for the Bank and the new switch

room

(j) Construction of cable trenches to accommodate both Kenya Power

and the Bank’s cables

(k) Service/repair of existing switchboard and associated switchgear

(l) Making good the existing switch room cable trenches and floor

(m) Provision of any other service necessary to actualize the

project

The works shall be carried out in accordance with generally accepted

standards of professional practice, following recognized engineering

procedures and standards.

The contractors’ scope of work is to cover all activities necessary to

accomplish the stated works, while adhering to best practices of the

profession, whether or not a specific activity is cited in this tender

2 COMMERCIAL TERMS AND CONDITIONS

2.1 Bank reserves the right to the following

(a) Reject any or all proposals received in response to the tender without

giving any reason whatsoever

(b) Waive or Change any formalities, irregularities, or inconsistencies in

proposal format delivery

(c) Extend the time for submission of proposal.

(d) Modify the tender document, by an amendment that would be

displayed on Bank’s Website

24

(e) Select the next most responsive Contractor if negotiations with the

Contractor of choice fail to result in an agreement within a specified

period.

(f) To independently ascertain information from other institutions to which

Contractor has already extended services for similar assignment.

(g) Apply whatever evaluation criteria deemed appropriate for evaluation

of Technical Bids.

(h) Terminate the services if the assignment is not proceeding in

accordance with the terms of contract or undue delay is taking place

in execution of the assignment.

(i) Modify the time period for completion of assignment during the

execution of assignment.

2.2 Force Majeure

The Contractor shall not be liable for forfeiture of its performance security,

liquidated damages, or termination for default if and to the extent that it’s

delay in performance or other failure to perform its obligations under the

Contract is the result of an event of Force Majeure.

For purposes of this clause, “Force Majeure” means an event beyond the

control of the Bidder and not involving the Service Provider’s fault or

negligence and not foreseeable. Such events may include, but are not

restricted to, acts of the Bank in its sovereign capacity, wars or revolutions,

fires, floods, epidemics, quarantine restrictions, and freight embargoes.

If a Force Majeure situation arises, the Bidder shall promptly notify the Bank in

writing of such condition and the cause thereof. Unless otherwise directed by

the Bank in writing, the Bidder shall continue to perform its obligations under

the Contract as far as is reasonably practical, and shall seek all reasonable

alternative means for performance not prevented by the Force Majeure

event.

2.3 Termination for Insolvency

The Bank may, at any time, terminate the Contract by giving written notice to

the Bidder if the Bidder becomes Bankrupt or otherwise insolvent. In this

event, termination will be without compensation to the Contractor, provided

that such termination will not prejudice or affect any right of action or

remedy, which has accrued or will accrue thereafter to The Bank.

2.4 Termination for Convenience

The Bank, by written notice sent to the Contractor, may terminate the

Contract, in whole or in part, at any time for its convenience. The notice of

termination shall specify that termination is for the Bank’s convenience, the

extent to which performance of the Bidder under the Contract is terminated,

and the date upon which such termination becomes effective.

2.5 Performance Guarantee

The Bidder selected for the assignment should furnish a performance

guarantee in favor of Kenya Commercial Bank, for 10% of the value of

accepted tender value valid for a period of 12 months ( from the date of

25

awarding contract) from a recognized bank other than Kenya Commercial

Bank. The performance guarantee shall be submitted within a period of 15

days from the date of contract award.

2.6 Time of completion & penalty clause

All works shall be completed within the agreed time schedule. If the

Contractor fails to complete the works within the stipulated time frame, the

Contractor shall be liable to pay The Bank pre estimated damages at the

rate of half percent of the final contract price for each week of delay or part

thereof subject to a maximum of 10% of the final contract value.

2.7 Injury to persons, property & Owner’s Indemnity

The Contractor shall be liable for and shall indemnify The Bank against any

liability loss, claim or proceedings whosoever arising under any statute or

common law in respect of personal injury to or the death of any person

whomsoever arising out of or in the course of carrying out the works unless

due to any act or neglect of The Bank or of any person for whom The Bank is

responsible.

Except of such loss or damage as is at the risk of The Bank under the Contract

the Contractor shall be liable for and shall indemnify The Bank against any

expense, liability, loss claim or proceedings in respect of any injury or damage

whatsoever to any property real or personal in so far as such injury or

damage arise out of or in the course of or by reason of carrying out the works

and provided always that the same is due to any negligence omission or

default of the Contractor his servants or agents or of any sub-contractor his

servants or agents.

2.8 Accidents

The Contractor shall within 24 hours of the occurrence of any accident at or

about the site or in connection with the execution of the work report such

accident to The Bank’s representative. The Contractor shall also report such

accident to the Competent Authority whenever such report is required by

law.

2.9 Labour laws

The Contractor shall comply with the provision of all Labour Laws of Kenya

and any other Act or enactment relating thereto and rules framed there

under from time to time.

2.10 Cost of tests

The cost of arranging/undertaking any test, as directed by The Bank shall be

borne by the Contractor.

2.11 Statutory authority obligations, notices, fees charges

The Contractor shall comply with and give all notices required by any act,

any instrument, rule or order made under any Act, or any regulation or by-law

of any County/Local authority or of any regulation of any agency which has

any jurisdiction with regard to the works or with whose systems the same are

or will be connected (all requirements to be so complied with being referred

to in these conditions as the statutory requirements).

26

If the Contractor shall find any divergence between the statutory

requirements and all or any of the contract documents or any variation

instruction issued in accordance with these conditions, shall immediately give

to The Bank’s Representative a written notice specifying the divergence.

If the Contractor gives notice or if The Bank shall otherwise discover or receive

notice of a divergence between the statutory requirements and all or any of

the contract documents or any variation, instructions issued in accordance

with these conditions The Bank shall within 7 days, of discovery or on receipt

of a notice, issue instructions in relation to the divergence. If and in so far as

the instructions require the works to be varied, they shall be deemed to be

Bank’s instructions issued in accordance with these conditions.

2.12 Work to be done to the satisfaction of The Bank

The Contractor shall execute, complete and maintain the work in strict

adherence with the contract to the satisfaction of The Bank and shall comply

with the specifications and adhere strictly to The Bank’s instructions and

directions on any matter (whether mentioned in the contract or not)

concerning the work. The Contractor shall take instructions and directions

from The Bank’s representative.

3 GENERAL SPECIFICATIONS

3.1 Extent of Electrical Installations

The tenderer shall include in his tender, prices for the design of new

installations, manufacture, inspection, testing, packing, shipment,

insurance, shipping, customs duties, taxes, delivery to site, unloading

and all other charges. The tenderer shall also include for complete

erection, tests on completion, setting to work, finishing and painting

and maintenance of all items of plant and equipment described or

implied within these Technical Specifications and shown on the

relevant drawings to the satisfaction of the Engineer.

The electrical services within the buildings shall be complete in all

respects as specified herein, and shall include all items of equipment,

materials, accessories, fittings, supports, etc. necessary whether such

items are specifically referred to in the Contract or not. The tenderer

shall be deemed to have included in his tender price all items

necessary such that the installations are complete in all respects and

left in good working order.

If awarded the Contract, the Contractor shall be expected to provide

fully detailed drawings of the entire installation together with layouts of

all civil and building works etc. required to accommodate / house the

plant and equipment, these layout drawings and details being related

to the existing layouts as may be necessary. The drawings shall be

submitted for approval within three weeks of the award of the

Contract such that the Engineer can be made aware of all

requirements. It shall be deemed to be the responsibility of the

27

Contractor to ensure all civil and builder's works required for this

Contract are prepared and / or provided to suit the program of this

Contract. No claims will be entertained.

All proposed new layouts and structures shall be subject to the full

approval of the Engineer and the Employer.

3.2 Program for Electrical Engineering Installations

The tenderer shall provide within a stipulated period of acceptance of

this tender and award of Contract, a complete program for the

electrical engineering installations to be executed indicating the

anticipated commencement and completion dates of the following

activities:

(i) Submission of working drawings for approval;

(ii) Placing of orders with other specialists for plant and equipment

to be incorporated in the works;

(iii) Receipt by the Contractor from other specialists of plant to be

incorporated in the works;

(iv) Manufacture by the Contractor of plant to be incorporated in the

works;

(v) Inspection and testing of installation by the Contractor to

Engineer’s satisfaction;

(vi) Shipment of the plant from country of manufacture;

(vii) Delivery of the plant and equipment to site;

(viii) Erection on site, details for all activities;

(ix) Kenya Power installations;

(x) Testing and Commissioning on Project Completion.

Operations shall be commenced when instructed and shall be carried

forward to completion with the greatest possible expediency, to the

satisfaction of the Engineer, in accordance with the Program. The

Contractor’s program shall be agreed with the Engineer and shall

adhere fully to the requirements and timing of the agreed timelines by

the client.

3.3 Drawings accompanying the Tender Documents

The Electrical Drawings indicate generally the arrangement of the

installations and are for assistance in tendering only. The position of

equipment and apparatus shown thereon are approximate only, the

exact positions, together with the actual runs of ductwork, trunking and

conduit etc., will be agreed upon with the Engineer, Architect and the

Employer prior to commencement of work. It shall be deemed that the

prices entered by the Contractor include for the repositioning, of the

various services, to meet the above requirements. No claims will be

entertained.

The Contractor shall satisfy himself as to the correctness of all Drawings

and measurements particularly the dimensions of the electrical

28

installations. If the Contractor finds any discrepancy in the Drawings or

between the Drawings and the Technical Specifications or between the

electrical installations and the Drawings, he shall immediately refer the

same to the Engineer who will make a ruling on the discrepancy. Figured

dimensions shall be taken in preference to the scale mentioned on or

attached to any Drawings. Details shown on Drawings shall be read in

conjunction with items included in the Technical Specifications.

The Engineer will furnish the Contractor within a reasonable time after the

receipt by the Engineer of a written request for the same, any details of

which, in the opinion of the Engineer are necessary for the execution of

any part of the works. Such a request to be made only within a

reasonable time prior to the execution of such work in order to fulfil the

Contract. One copy of the Drawings, details and Technical Specifications

shall be kept on the site until the completion of the Contract and the

Engineer shall at all reasonable times have access to the same. The

Contractor shall return all copies of Drawings and other relevant details

to the Engineer on the completion of the Contract.

Additional Drawings will be issued by the Contractor to the Engineer to

suit the design requirements of the works. These Drawings being issued

either during or after the tender period as may be required or necessary.

These Drawings will supplement the details contained within the

Technical Specifications and Bills of Quantities and the Tenderer shall be

deemed to have taken these into account in his pricing. Where the

Contractor can demonstrate that the Drawings relate to new approved

or additional items these new or additional items shall be priced to

approval in accordance with the Contract rates and prices.

3.4 Contract Working Drawings

The Contractor shall prepare fully detailed Working Drawings for all items

of plant, equipment and accessories required for installation under this

section of the Contract. Two copies of each Drawing shall be

forwarded to the Engineer for approval and or comments. One copy

will be returned stamped "approved" or "not-approved". Where

Drawings require further information and / or modifications to meet the

comments made by the Engineer they shall be re-submitted, again in

duplicate, for approval.

When Drawings have been approved two further copies shall be

forwarded to the Engineer, together with copies to the Employer.

Drawings, and, where relevant, calculations in respect of the following

shall be prepared by the Contractor and submitted to the Engineer for

his approval commencing within five (5) days from acceptance of the

tender.

All drawings shall be to scale and fully detailed with all the important

dimensions shown and the construction of key components indicated.

29

During progress of the building works, the Contractor shall make all

necessary checks on site to ascertain that the various services can be

installed as specified and shown on the approved Drawings.

Where such works cannot be so installed, this must be immediately

brought to the notice of the Engineer and employer prior to the progress

of such works.

The Engineer, in conjunction with the Employer, will check and return the

Drawings submitted for approval within a reasonable period, but in any

case not exceeding five (5) days from receipt of the Drawings.

The layouts of plant and equipment are for general guidance only.

The Contractor shall assess the requirements and prepare a plant

layout for approval within seven (7) days, the required liaison being

maintained with other specialists, such that an agreed layout is

submitted for approval.

3.5 Record Drawings (“As Installed Drawings”)

As soon as the works are complete and all tests satisfactorily carried

out, the Contractor shall hand to the Engineer two sets of Record

Drawings, together with one set of negatives of the same, showing the

works as finally installed. These Drawings shall be prepared on

approved transparent plastic material in black ink or as approved by

the Engineer. The certificate, of making good defects, will not be issued

until this condition has been complied with. Record Drawings are in

addition to detailed Working Drawings and shall show all cable routes,

circuits, trunking, conduits, plant, trenches, ductwork and ducts etc., as

finally installed.

The Engineer will provide the Contractor with a set of Contract

Drawings (in addition to the two sets provided for the Contractor's site

and office use), which shall be maintained by the Contractor's

representative on site and which shall be used for recording of

Contract variations as they occur. This set of Drawings shall be

available for the Engineer's inspection on site, and shall be kept up to

date.

The cost of the preparation and submission of the above Contract and

Record Drawings shall be deemed to be included within the

Contractor's prices.

3.6 Data Schedule

As part of the submittals the Contractor will be required to submit data

schedule and technical literature for the materials and equipment to

be supplied under this contract. These shall be submitted to the

Engineer for approval before delivery of similar materials to site. It shall

be deemed to be the responsibility of the contractor for any materials

found on site without Engineer’s prior knowledge.

30

3.7 Maintenance Manuals

At the start of the defects liability period, the Contractor shall hand

over to the Engineer, four sets of maintenance and operations manuals

for each plant and equipment installed. These manuals shall be in

English and shall be fully illustrated.

3.8 Builder's Work and Civil Works

Builder's Work and Civil Works that are incidental to this section of the

Contract such as cutting of holes in walls and floors, provisions of

foundations for the plant and machinery, shall be the responsibility of the

Contractor. The Contractor shall be fully responsible for the preparation

of all such details that relate to such works, the details being subject to

approval by the Engineer prior to submission to the Main Contractor for

action. Other items such as fixing of brackets, cables and ductwork and

trenching, making good etc. shall be carried out by the Contractor to

suit the installation of all the services. In the absence of the main

contractor, the contractor shall seek the services of qualified

subcontractor for the civil/structural work.

It is the Contractor's sole responsibility to ensure that all holes and chases

are in the required position and that any additional ducts, holes and

chases necessary for erection of the installations in situ concrete walls,

floor slabs etc., are included in the early stages of construction as

appropriate.

The Contractor shall furnish the Engineer with all the necessary

information including position of foundations, brackets and fixings and

shall ensure that such works are performed in accordance with

available information.

The Contractor shall include in his tender all supports, fixings, plugging of

holes in walls, ceilings and floors to facilitate the fixing of the pipe work,

accessories, and all other portions of the plumbing, drainage and

firefighting installations. Any purpose-made fixing brackets shall also be

provided and installed by the Contractor, including escutcheon plates

and the like.

The Contractor shall supply and install approved pipe work support

brackets and hangers. It shall be deemed that prices include for any

special requirements and that the Contractor has visited the site during

the tender period to ascertain all details.

The Contractor shall pay particular attention to the fixing and alignment

of items. All items shall be installed square, true and perpendicular to

floors i.e. as shown on Drawings and as may be required at site to the

Engineers approval.

The contractor is required to engage a qualified Civil/Structural

contractor to do all the civil/structural works. A valid proof of

Registration by NCA will be mandatory.

31

3.9 Commissioning of the Electrical Installation

The Contractor shall instruct the Employer’s Maintenance Engineer or

his representative on the operation and maintenance of the various

components forming the electrical installation and shall provide

drawings, diagrams and manuals to ensure the Maintenance Engineer

or his representative is completely conversant with such installations.

The Contractor shall ensure that the services installations are left in

complete safe working order and operating to the satisfaction of the

Engineer.

3.10 Regulations and Standards

The Installations must be carried out strictly in accordance with the

following documents: -

Electrical Services:

(i) The current edition of the IEE Wiring Regulations , BS 7671;

(ii) Relevant International Standards;

(iii) Current Regulations and by-laws of Kenya Power (Kenya side);

(iv) Regulations and by-laws of the Ministry of Energy;

(v) Kenya Local Authority By-Laws;

(vi) Current Regulations of Telkom Kenya (Kenya side);

(vii) By-laws of the Energy Regulatory Commission (ERC);

(viii) Any other duly constituted authorities regulations having jurisdiction

over the Works;

(ix) Water Supply and Sewerage Authority’s Regulations;

(x) The Specification and accompanying documentation and

Drawings;

(xi) The Working Drawings produced by the Contractor and approved

by the Engineer.

The Contractor shall undertake all modifications demanded by the

authorities in order to comply with the regulations, and produce all

certificates, if any, for the authorities at no extra charge.

3.11 Quality of Materials

All materials, equipment, plants, fittings and accessories are to be new

and in accordance with the requirements of the current rules and

regulations where such exist, and with the relevant international

standards.

Uniformity of type and manufacture of equipment, plants, fittings and

accessories is to be as far as practicable preserved throughout the

whole Works.

Wherever the term 'similar to' is used in these Technical Specifications in

reference to any item, the word will be understood to mean type and

quality of the equipment and not preference.

32

Where particular manufacturers only are specified herein no alternative

makes will be considered without good reasons.

All materials shall be of good quality, suitable for the purpose specified,

and to the approval of the Engineer.

3.12 Workmanship

The tenderer shall take into consideration, when pricing his tender, that

there will be other specialists working alongside him. Any disruptions to

the existing services must therefore be kept to a minimum, and in this

respect the Contractor shall include in his prices for carrying out Works

outside normal working hours as may be directed by the Engineer. No

claim will be entertained where abnormal working hours are required

to meet this requirement and completion of the works within the

specified Contract period.

The Contractor shall be fully responsible for co-ordination of installation

of all services. For all services involving ducted wiring, such wiring shall

be capable of future addition or maintenance.

The Contractor shall be deemed to have included in his tender prices for

relocating equipment, plants, switches, terminal points, ductwork, outlets

and fixtures in positions and / or locations at least one meter in any

direction from the positions indicated on the Drawings. Within these

limits no variations in the Contract sum will be made unless the work has

already been executed in accordance with previously approved

Working Drawings.

Only qualified and certified persons shall be allowed to carry out

installation work. The Works shall be performed in a neat and

workmanlike manner.

The Contractor shall take every precaution to avoid damage to the

existing property including cars, driveways, cables, drains and other

services, and he will be held responsible for and shall make good all

such damage at his own expense to the satisfaction of the Engineer.

The Contractor will be responsible for the exact runs and placing of pipe

work, conduit, boxes, ductwork and accessories that are to be cast in

concrete, ceilings, floors, walls, columns and beams, and for the proper

fixing of the pipe work and accessories to the shuttering and the steel

reinforcement work, including raising of the slab with mass concrete,

walling etc.

Where ductwork is to be concealed, the pipes etc. shall be in an exact

position relative to the finished floor levels or such other finishes as may

be applied to enable adequate cover to be applied.

Where services are run above the false ceilings the Contractor shall

ensure that access to all services is readily available such that future

maintenance can be carried out without difficulty. Full details shall be

33

included on the Working Drawings such that the Engineer can give

consideration to the Contractor's proposals.

3.13 Setting out of work

The Contractor will be responsible for laying out his work and shall

obtain all the necessary information as may be required to carry out

the work. Such information shall be obtained sufficiently in advance to

avoid any possibility of delay to the Works as a whole.

The Contractor shall be fully responsible, and shall seek, the details of all

work being carried out by the various trades on Site, particularly where

such trades may interfere with each other, or where co-ordination is

necessary. No claims for extra costs will be entertained arising from

omissions, oversight, or neglect in this regard.

In advance of the delivery of the plant and equipment, the Contractor

shall arrange for the supply of all-necessary foundation bolts, templates,

nuts, plates, sleeves, anchorages, etc., as required and as may be

directed by the Engineer.

3.14 Erection and checking of work

The Contractor shall provide, and be solely responsible for, all skilled

and unskilled labour, tools, lifting tackle and other equipment required

for handling of plant and equipment when transporting to Site, within

the Site and during erection.

All erection works shall be subject to approval by the Engineer.

All parts shall pass such tests as required by the Engineer to prove

compliance with the Contract irrespective of any tests which may

already have been carried out at the Manufacturer's Works. In

particular all electrical pressure tests made at the Manufacturer's Works

shall be repeated at voltages approved by the Engineer.

The Contractor shall supply and install all supports, fixings, brackets and

similar items as may be necessary for the completion of the installation

of the services as specified and as shown on the Drawings.

3.15 Site performance and acceptance tests

The Contractor shall give notice of the date of the specified tests to be

performed on completion of installation. The notice shall be made in

writing to the Engineer at least five days to the date of the specified

tests. Unless otherwise agreed the tests shall take place within seven

days of the stated date or on such day or days as the Engineer shall in

writing notify the Contractor in writing. The tests shall be carried out

under normal working conditions to the satisfaction of the Engineer and

shall extend over such continuous periods as he may direct.

All skilled labour, supervision, apparatus, fuel and instruments required for

carrying out the tests will be the responsibility and at the expense of the

34

Contractor. The accuracy of the instruments shall be demonstrated if

required. The Contractor shall ensure that test instruments are in good

working condition and have been calibrated by an authorised agent.

If any part of the plant or equipment fails to pass the specified tests,

further tests of the said part shall, if required by the Engineer, be

repeated. The Contractor shall, without delay, put in hand such

modifications as found necessary so as to meet the requirements of the

Contract and any expense which the Client may have incurred by

reason of such further tests shall be deducted from the Contractor’s

Contract price.

Each completed system within the installation shall be tested as a

whole under operating conditions to ensure that each component

functions correctly in conjunction with the rest of the system.

3.16 Test records

The Contractor shall make the necessary records of all the tests carried

out, and when the tests have been successfully completed he shall

provide the Engineer with test records and reports in a format to be

agreed.

3.17 Dust, insect and vermin proofing

All equipment, likely to be affected by ingress of dust, shall be effectively

dust proofed and vermin proofed where no protection is afforded in its

normal manufactured form. All materials used shall be in general

resistant to attack by insects, micro-organisms or other fauna or flora.

Materials used for such protection shall be to the approval of the Client

and Engineer.

3.18 Painting and finishing

All mechanical and electrical plant and equipment installed under this

Contract shall be painted or otherwise finished to approval in

accordance with appropriate international code for standard colours

to be furnished by the Contractor prior to the shipment or manufacture

of the plant or equipment including all pipe work, ductwork, etc. Such

finish shall be entirely compatible with the conditions of heat, humidity,

exposure to the weather, and other relevant factors arising from the

materials, location and condition of operation of the equipment.

Paintwork will be measured in the builder's work in connection with the

Engineering Element. Any additional work will be measured in

accordance with the conditions of the Contract.

The Engineer may request samples of paint finishes, the cost of which

shall be deemed to have been included within the tendered prices for

all works.

All final painting of plants, equipment, fixtures, and accessories shall be

carried out by the Contractor, except where it is the usual practice of

35

the manufacturer of items of plant and equipment to apply a high

standard of protective finishing paintwork in the shop before despatch.

This will be acceptable provided the Contractor at his own costs makes

good any damage to paintwork, occurring in shipment, transportation

and installation.

The interiors of electrical switchboards control panels, and similar items,

shall be finished in an approved enamel colour and shall comply with

the appropriate international standards for enamel finish which shall be

furnished by the Contractor prior to shipment or manufacture of the

plant or equipment. The exteriors of such panels and enclosures shall

be of international standards specification colour as specified by the

Engineer.

3.19 Labels

All items of electrical plant, equipment, Sub-main distribution boards,

etc. shall be neatly and clearly labelled externally with identification

marks corresponding with those on Drawings or in Technical

Specifications. Final details shall be agreed upon by the Contractor

and the Engineer.

Identification labels shall be of laminated plastic material engraved,

white on black or white on blue, with no less than 6mm "Lino" style letters

and shall be fixed on or adjacent to all items by means of at least two

brass screws or to the approval of the Engineer. Self-adhesive labels shall

not be permitted.

All main switches, circuit breakers, isolators, valves, motors, switch-fuse,

consumer service units, and distribution boards etc. shall be neatly and

clearly labelled externally with identification marks corresponding with

those on the Drawings or Technical Specifications. Final details shall be

agreed upon by the Contractor and the Engineer. All labels / plates

shall be in English.

3.20 Specialist manufacturers

Where specialists are not nominated by the Employer, the Contractor

shall appoint specialist manufacturers and suitable specialists for any

sections of the Works described herein in which he is not himself an

experienced, recognized and approved specialist.

The tenderer shall, on submission of his tender, indicate the names of all

proposed specialist manufacturers and specialists, together with the

precise sections of the Works for which each will be responsible. The

Contractor may be required to seek alternative manufacturers or

Contractors or to accept specialists nominated by the Employer; it shall

be deemed that the prices entered in the tender include for this

requirement. For plant and equipment supplied by suppliers other than

the Contractor, the Contractor will be required to furnish an agreement

between himself and the supplier stating that he is authorised by the

36

supplier to deal in the plant and equipment and that he is authorised

to stock the necessary spare parts or that the Employer will be

authorised to revert to the supplier in the event of breakdown of the

plant or equipment.

The Contractor shall allow in his prices for phasing his work to meet the

requirements of the other specialists, and for varying his program or

otherwise, to comply with the erection program of such specialist. No

additional costs will be allowed to the Contractor for any disruptions to

his program, or otherwise, in his compliance with the above

requirements.

3.21 Interference with the existing Works

The Contractor shall not interfere in any way with any existing works

whether the property of the Employer or of a third party and whether

the position of such works is indicated to the Contractor by the

Engineer or not. The exception being where such interference are

specifically described as part of the Works either in the Contract or in

any form of instruction from the Engineer.

3.22 Protection of Works

The Contractor shall carefully protect from injury by weather all Work

and materials which may be affected thereby and allow in his prices

for all dams, pumping, shoring, temporary drains, sumps etc. necessary

for the purpose. The Contractor shall clear away and make good at his

own cost to the satisfaction of the Engineer all damage caused

thereby.

3.23 Sundries

The necessary holding down bolts, supporting brackets and templates,

guards and screens, locks, piping, conduits, lamps and other requisite

sundries whether specified in detail or not shall be provided, under the

Contract and it shall be deemed that the Contractor's prices, rates and

the like include for all such items.

3.24 Schedules of technical data

Where included in the Tender Documents, all tenderers shall complete

Schedules of technical data; otherwise the Tender may not receive full

consideration, and will be liable to rejection.

3.25 Copies of orders

Copies of all orders for major items of plant, equipment and materials

places with suppliers shall be provided in triplicate to the Engineer.

3.26 Inspection and tests at Manufacturer's Works

The Engineer, and his duly authorised representative, shall have at all

reasonable times access to the Contractor's premises to inspect and

examine the materials and workmanship of the mechanical and

37

electrical plant and equipment during its manufacture there. If part of

the plant and equipment is being manufactured on other premises, the

Contractor shall obtain for the Engineer and for his duly authorised

representative permission to inspect as if the plant and equipment was

manufactured on the Contractor's own premises. Such inspection,

examination or testing, if made, shall not relieve the Contractor from

any obligation under the Contract.

Where the plant and equipment is a composite unit of several

individual pieces manufactured in different places, it shall be

assembled and tested as one complete working unit, at the Maker's

works, to the relevant International Standards where applicable.

4 TECHNICAL SPECIFICATIONS FOR 11KV METAL CLAD

PROTECTION AND METERINGSWITCHGEAR PANEL

This specification has been prepared by Aberdare Engineering Ltd and

it lays down requirements for 11kV metal clad switchgear panels. It is

intended for use by KCB in purchasing the equipment.

4.1 General specifications

4.1.1 Scope

This specification covers the design and engineering, manufacture,

testing at the manufacturer’s factory, painting, packing for transport,

insuring, shipping, and delivering to the port of Kenya, landing, customs

clearing, transporting and delivery to KCB stores of 11kV Indoor Metal

Protection and Metering Switchgear Panels.

Subsequent paragraphs will give details descriptions and requirements

for the switchgear panels, including circuit breakers, current

transformers, voltage transformers, protection relays, metering,

measuring, indicating control devices and other equipment/device,

specified herein.

4.1.2 Standards

Rating characteristics, tests and test procedures, etc. for the 11Kv metal

clad switchgear panels and all the protection relays, measuring

indicating instruments and the control and monitoring devices and

accessories, including current transformers and voltage transformers

shall comply with the provisions and requirements of standards of the

international electro-technical commission (IEC), and also relevant ANSI

standards where specified.

The latest revision or edition in effect at the time of bid invitation shall

apply. Where references are given to numbers in the old numbering

scheme from IEC it shall be taken to be the equivalent number in the

new five-digit number scheme. The bidder shall specifically state the

precise standard, complete with identification number, to which the

38

various equipment and materials are manufactured and tested. The bid

document may not contain a full list of standards to be used, as they

referred to where useful clarification of text.

4.1.3 Unit of measurement and language

In all correspondence, in all technical schedules and on all drawings

prepared by the manufacturer, the metric units of measurements shall

be used. On drawings or printed pamphlets where other units have

been used, the equivalent metric measurements shall be added. All

documents, correspondence, drawings, operating and maintenance

instructions/manuals and nameplate details of the equipment shall be

in English language.

4.1.4 Service conditions

From the geographical condition, the area where the switchgear

panel shall be installed is categorized in to the tropical climate zone. In

choosing material and their finishes, due regard shall be given to the

humid tropical conditions under which the switchgear panels shall be

called upon to work. The manufacturer of the switchgear panel shall

submit details of his usual practice of tropicalization which have been

proven satisfactory for application to the switchgear panels and

associated equipment’s to prevent rusting and ageing in the tropical

climate zone. The applicable standards of tropicalization shall be

listed.

4.1.4.1 Climate Conditions

Unless otherwise specifically stated in particular technical specifications

any equipment’s or component or assembly shall be designed for the

following service conditions:

Parameter Max Min

Ambient air temperatures

Outdoor +40ºC -1ºC

Indoor +40ºC -1ºC

24 hour average maximum +30ºC -1ºC

Relative humidity 90-100%

Height above sea level 2200m

EMC Class (IEC 61000) Industrial environments

Seismic coefficient 1.5

Rainfall conditions

Average 800-1700mm/year

Maximum 160mm in 24hrs

Annual mean isokeraunic level Max 180 thunderstorm days

Pollution (IEC 60815) Heavy : class II

Creepage 25 mm/kV

39

4.1.4.2 Switchgear room temperatures

The switchgear panel shall be installed in a room without air

conditioning but with ventilation to allow natural cooling. Therefore all

the protection and control devices employed shall be capable of

operating in this environment without failure for their designed life time.

Particularly the power supply modules of the protection and control

devices shall be designed for minimum heat generation and effective

heat dissipation to ensure that the temperatures of these devices

enclosed in the relay panels at the above listed ambient temperatures

shall not exceed the maximum operating temperatures of the device.

4.1.4.3 Tropicalization

All equipment must be designed for operations in the severe tropic

climate conditions and fully comply with climatic aging tests as per IEC

60932-class 2.

In choosing materials their finishes, due regard shall be given to the

humid tropical conditions under which the switchgear will be called

upon to work. The manufacturer shall submit details of his usual

practice which have proven satisfactory for application to the parts of

the switchgear panels, which may be affected by tropical conditions.

4.1.5 Metals

Iron and steel are generally to be painted or galvanized as

appropriate. Indoor parts may alternatively have chromium or

copper-nickel plates or other approved protective finish. Small iron and

steel parts (other than trustless steel) of all instruments and electrical

equipment, the cores of electromagnets and the metal parts of relays

and mechanism shall be treated in an appropriate manner to prevent

rusting.

4.1.6 Screws, Nuts, springs, etc.

The use of iron and steel shall be avoided in instruments relays wherever

possible. Steel screw shall be Zinc, Cadmium or Chromium plated or

where plating is not possible owing to tolerance limitations, shall be of

corrosion resisting steel. Instrument screws (except those forming part of

magnetic circuit) shall be of brass or bronze. Spring shall be of non –

rusting materials e.g. phosphor-bronze or nickel silver, as far as possible

4.1.7 Rubbers

Neoprene and similar synthetic compounds, not subject to

deterioration due to the climatic conditions, shall be used for gaskets,

sealing rings, diaphragms, etc.

40

4.2 Working stress and equipment/apparatus design

4.2.1 General

The design, dimensions and materials of all parts shall be such that

they will not suffer damage under the most adverse conditions for

result in deflections and vibrations, which might adversely affect the

operation of the equipment. Mechanisms shall be constructed to

avoid sticking due to rust or corrosion.

The equipment and apparatus shall be designed and manufactured

in the best and most substantial and workmanlike manner with

materials best suited to their respective purpose and generally in

accordance with up-to-date recognized standards of good practice.

The equipment shall be designed to cope with 0.2g horizontal

acceleration of seismology on the center of gravity.

Whenever possible, all similar parts, including spares parts, shall be

made interchangeable. Such parts shall be of the same materials and

workmanship and shall be constructed to such tolerances as to

enable substitution or replacement by spare parts easily and quickly.

All equipment shall be designed to minimize the risk of fire and

consequential damage, to prevent ingress of vermin and dust and

accidental contact with electrically energized or moving parts. The

switchgear panels shall be capable of continuous operation with

minimum attention and maintenance in the exceptionally severe

conditions; likely to be obtained in a tropical climate and where the

switchgear is called upon to frequency interrupt fault current on the

system and also where the duty of operation is high.

4.2.2 Strength and quality

All steel casting and welding shall be stress –relieved by heat treatment

before machining, and castings shall be stress-relieve again after repair

by welding.

Liberal factors of safety shall be used throughout, especially in the

design of all parts subjects to alternating stresses or shocks.

4.2.3 Design data low voltage equipment

Low voltage equipment and installation shall be in accordance with

EMC directives. The rating and design criteria for low voltage

equipment shall be as follows:

4.2.3.1 AC Supply Rating system

Rated voltage between phase 415 V AC

Connection type 3ph 4wire

Rated voltage between phase to earth 240 V AC

Grounding system PME

Frequency 50 HZ

41

The AC supply shall be used for power circuit and lighting, indicating,

motors controls and similar small power circuits.

Unless otherwise specified, the equipment provided under this tender is

to be capable of reliable operation at voltage as low as 85% of the

rated voltage, and to withstand continuously up to 110% supply

voltage above the rated value of 240 or 415 AC.

4.2.3.2 DC Auxiliary Supply Rating

Equipment /Device Rated

voltage

30V DC

Connecting type 2 wire

Voltage variation 24 – 40 V DC

The auxiliary dc supply shall be used for controls, indication, alarm,

protection relays and circuit breaker tripping and closing circuit, etc.

All equipment and apparatus including the circuit breakers, protective

relays, control devices and accessories, measuring and indicating

instruments and electronic equipment shall be capable of satisfactory

operation at 80% to 130% of the rated supply voltage.

4.2.3.3 Design data for Medium voltage plant and equipment

The rating and design criteria for the MV plant and equipment shall be

as follows:

ITEM PARAMETERS SYSTEM PARAMETERS

1 System description 50 Hz, 3 phase,3 wire

2 Neural point earthing Solid earthed

3 Nominal system voltage 11 kV

4 Highest system

(service)voltage as

defined by IEC-600038

12 kV

5 Highest Equipment Rated

Voltage as Define by IEC-

60071

17. 5kV

6 Symmetrical Short- Circuit

Rating

31.5 kA

7 Short-Circuit current

withstand, not less than 3

31.5kA

Voltage variation +/-10%

Frequency variation +/-2%

Power frequency 1 min, Test Voltage 3kV

Thermal rating of conductors 120% of load

Max short-circuit Current 31.5kA

42

second

8 Dynamic peak current

(min making current)not

less than

78kA

9 Rated current of bus bars

and circuit

630A

10 Minimum rated

continuous current of

circuit breakers

630A

11 Insulation level according IEC 60071:

11a Lighting impulse withstand

voltage (1.2/50µkVpeak)

95 kV

11b Test voltage at power

frequency 1 min dry and

wet. To earth and

between phases

38kV

12 For the design and erection of Bus bars the following

minimum clearances shall be observed

12a Phase to earth [mm] 300

12b Phase to Phase [mm] 250

16 Minimum nominal

Creepage distances as

defined as IEC

60815,Table II

25MM/kV

5 BASIC REQUIREMENT FOR ELECTRICAL EQUIPMENT

All materials is supplied under this Contract shall be new and of the best

quality and the class most suitable for working under the conditions

specified. They shall withstand the variations of temperature and

atmospheric conditions arising under working conditions without

distorting, deterioration or undue stress in any parts and also without the

affecting the suitability of the various parts of the Works for which they

were designed.

5.1 Electrical controls, auxiliaries and power supplies

5.1.1 Responsibility for electrical control and auxiliaries.

The manufacturer shall provide all control, indication, alarm and

protection devices and all auxiliary equipment with wiring and

interconnecting cable which are integral parts of or are directly

associated with or mounted on the switchgear panels to be under this

tender. The design of protection and control schemes for the

switchgear shall be subject to approval by the employer.

43

5.1.2 Operation and control

Inter locking devices shall be incorporated in the control circuit to

ensure safety, and proper sequence and correct operation of the

equipment.

5.1.3 Corona and radio interference

(a) Switchgear shall electrically be designed to avoid local corona

formation and discharge likely to cause radio interference.

(b) The design of joining of adjacent metal parts and surfaces shall be

such as to prevent corrosion of the contact surface and to maintain

good electrical contact under service conditions

(c) Particular care shall be taken during manufacturing of busbars and

fitting and during subsequent handling to ensure smooth surface free

from abrasion. All joints on the busbars and the circuits within the

switchgear board shall be silver or tin-plated to ensure good electrical

connection.

5.1.4 Switchgear Panels

(a) The switchgear panels shall be dead –front, floor- standing, rigid

welded steel frames, completely enclosed by metal sheets and

suitable for indoors installation.

(b) The floor – standing switchgear panel shall have provision for bolting

to the floor.

(c) Suitable terminal blocks shall be provided for all out going power and

controls cables. All cable terminals shall generally be located for

bottom entry connections.

(d) The Switchgear panels shall be painted to RAL 7032 colour

(e) Enclosures for the switchgear panel and for other electrical

equipment shall have the following degree for protection (ref IEC

60034, IEC 605529 and IEC 60947):

Equipment Degree of protection

Medium voltage enclosed

switchgear Panel

IP 43

In door control and relaying

equipment

1P 51

(f) Interior illumination lamps operated by door switches shall be

provided for control and energy meter compartments. The lamps

should be easily available in the local market for future replacements.

One 240V ac socket outlet of 3- point square terminals shall be

provided for each switch gear panel in the control compartment.

(g) Space heaters for 240V AC shall be provided inside the switchgear

panel, for circuit breaker and control compartment’s to prevent

moisture condensations. A hygrostat control unit with variable

44

temperatures and humidity control setting shall be installed to control

the heater.

5.1.5 Measuring Instrument

(a) All measuring instruments, including energy meters, shall be of flush-

mounted, back-connected, dust-proof and heavy –duty

switchboard type. Each measuring instrument shall have a

removable cover, either transparent or with a transparent window.

Each instrument shall be suitable for operation with the instrument

transformers detailed in these specifications, under both normal and

short-circuit conditions.

(b) For analog type instrument, scale plates shall be of a permanent

white circular rectangular finish with black pointer and markings.

The scale range shall be determined from the current transformer

and voltage transformer ratios and is given in the detailed

specifications for each instrument.

(c) All measuring instrument of analog type shall be approximately

110mm² enclosures and shall be provided with clearly readable

long scale, approximately 240 degrees. The maximum error shall be

not more than one a half (1.5) percentage of full-scale range.

5.1.6 Indicating lamps

(a) Indicating lamp assemblies shall be of the switchboard type,

insulated for 30 V DC service, with appropriately coloured lens. The

lens shall be made of material, which will not be softened by the

heat from lamps

(b) For the circuit breakers, red indicating lamps shall be used for “ON”

position, green lamps for “OFF” position indication and amber for

circuit breaker auto trip.

5.1.7 Nameplate and Escutcheon Plates

(a) Nameplates and Escutcheon Plates

Each cubicle, panel, meter, switch and device shall be provided with a

nameplate or escutcheon plate for identification with English

description and also where appropriates the IEC number on the front of

the panel directly below each device as appropriate. On the inside of

control compartment of the switch gear panel, a white label,

engraved in Black Letters and Numbers shall be fixed on or below each

device. The device name /number fixed on the inside of the control

compartment shall correspond to the name/number used in the

drawings. Each major equipment shall be provided with a rating plate

containing the required information as specified in the relevant IEC

standards.

(b) The plates shall be made of stainless steel and shall not be deformed

under the service conditions at the site. The entries on the plates

45

shall be indelibly marked by engraving with black letters on a white

background or vice versa as specified

5.2 Wiring

5.2.1 General

(a) All wiring inside the switchgear panel shall be done with PVC

insulated not wire not less than 2.5sq.mm, flexible cable. A suitable

wiring duct system firmly fixed on the panel and having covers shall be

installed for front-to rear panel wiring as well as for wiring within the

panels, which will provide easy access for inspection and replacement

of wires.

(b) Wiring between terminals of the various devices shall be point to

point. Splices or tee connection will not be acceptable. Wire runs

from the duct to the device shall be neatly trucked or clamped.

(c) Exposed wiring shall be kept to a minimum, but where used, shall be

formed into compact groups suitably bound together and properly

supported.

(d) Instrument transformer secondary circuits shall be grounded only on the

terminal block in the control compartment facilities for short circuiting

the current transformers secondary windings while the switchgear

panel is in service shall be provided.

(e) Cable support and clamp type terminal lugs shall be provided for all

incoming and outgoing power wiring terminated at each panel. All

wiring conductors (wires) shall be marked at each point of termination

onto the terminal block or device. These wire makers shall be of an

approved and permanently attached to the conductor insulation. The

method of ferruling shall be subject to approval by the employer. It is

however preferred that the wire marker (ferrule) correspond to the

device number or terminal block number and the number of the

terminal where is connected. All the devices and the terminal blocks

must therefore have unique numbers.

(f) The Class 0.2 current transformer cores shall be connected directly to

the Energy meter compartment using a 4mm², 4/c steel armoured

multi-core control cable.

(g) The class 0.2 voltage transformer cores shall be connected directly

to the energy meter compartment using a 4mm² 4/c steel armoured

multi-core control cable. In the energy meter compartment, the cable

shall be terminated on a suitable 4-pole MCB with a normally closed

auxiliary contact (closed when the MCB is off). The normally closed

contact of the MCB will be wired to trip the main circuit breaker.

(h) All the wires shall be lugged before termination on to termination

boards and on the terminal boards and on the devices to ensure

durability of the connections.

46

5.2.2 Phase arrangements

The standard Phase arrangement facing the front of the panel shall be

R-S-T-N and P-N from the left to right, from top to bottom, and from

front to back for AC three-phase and single Phase circuits. For DC

circuits it shall be N-P from left to right, P-N from top to bottom and

front back. All relays, instruments, other devices, buses and equipment

involving three phase circuit shall be arranged and connected in

accordance with the standard phase arrangements wherever

possible.

5.2.3 Wiring colour

All wires shall be ferrules at all terminations to distinguish each wire and

terminal. In addition, the wire shall have the following colours

Circuit Color

Voltage transformers/Current

transformers

R, Y, B, BLK

Auxiliary A.C. supply connection

cable/bus-wire

Brown and Black

D.C. controls wiring within the panel Grey or Black

Grounding/earthing cable /wire Green with yellow stripes

5.2.4 Phase and polarity colour code

Following coloured ferrules shall be on each wire in order to identify

phase and polarity.

Phase and polarity Colour

A.C., three – phase, for

CT and VT secondary

wiring

First phase Red

Secondary Phase Yellow

Third phase Blue

Neutral Black

A.C., single-phase First Phase Red

Neutral Black

Ground Green with yellow

stripes

Positive Brown

Dc auxiliary Supply

connection

Negative Black

Cable markers and wire numbers systems must be submitted to the

employer for approval before commencing the detailed design works

for protection and control.

5.2.5 Terminal blocks

(a) Terminal blocks for control wiring shall be rated not less than 6000V AC.

(b) White or other light-coloured marking strips, fitted to each terminal

block, shall be provided for circuit designation.

47

(c) The terminal arrangement, including the terminal blocks for VT and CT

circuit connections, shall be subjected to the employers’ approval. A

total of not less than 20 spare terminals shall be provided for future

use.

(d) Shorting Links shall be provided on the current transformers (CT) circuits

on the terminal block. It shall be possible to short the CTs under live

system conditions without open-circuiting the CTs.

(e) Isolation links (sliding Links) shall be provided on the trip circuits, alarm

and on the VT circuits to allow easy isolation of these circuits without

disconnecting the wires from the terminal block.

(f) Each individual terminal block shall be marked with a distinctive

number, which shall be the same number used in the drawings, for

identification purposes. The TB number shall be engraved in black

numbers in white background and shall be durable so as to last the life

time of the switchgear panel.

(g) Each set of terminal block shall be identified by a label to distinguish it

from another set of terminal block. The numbers used to mark the

terminals on the terminal block shall be unique.

(h) The labels used will match those used in the drawing.

5.3 Equipment and switchgear earthing

All the compartments including the hinged doors of the Switchgear

Panels and all the earthing points of the equipment installed/mounted

in the Switchgear panels shall be connected to the grounding

conductor at the bottom of the panel for external connection to the

substation earthing system.

Earthing conductors shall be of annealed high conductivity copper

stranded in accordance with Table 4 in BS 6346 and protected with an

extruded PVC sheath of 1000 volts grade. The earthing conductor on

the primary equipment such as the Earth Switch as well as for external

connection to the substation Earthing – grid shall be adequate to carry

the rated switchgear short-circuit current of 31.5kA for 3 seconds.

5.4 Materials and workmanship

5.4.1 General

(a) Materials shall be new; the best quality of their respectively kinds and

such as are usual and suitable for work of like character. All materials

shall comply with the latest issue of the specified standard unless

otherwise specified or permitted by the employer.

(b) Workmanship shall be of the highest class throughout to ensure reliable

and vibrations free operations. The design dimensions and materials of

all parts shall be such that the stresses to which they may be subjected

shall not cause distortion, undue wear, or damage under the most

severe conditions encountered in service.

48

(c) All parts shall conform to the dimensions shown and shall be built in

accordance with approved drawings. All joints, datum surfaces and

meeting components shall be machined and all castings shall be spot

faced for nuts. All machined finishes shall be shown on the drawings.

All screw, bolts, stud and nuts and threads for pipe shall conform to the

latest standards of the International Organization for Standardization

covering these components and shall all conform to the standards for

metric sizes.

(d) All materials and works that have cracks, flaws or other defects or

inferior workmanship will be rejected by the employer.

5.4.2 Assembly

Necessary items of equipment shall be assembled in the factory prior to

shipment and routine tests shall be performed by the manufacturer as

per requirements of the latest issue IEC as specified under each

equipment in these specifications to demonstrate to the satisfaction of

the employer that the switch gear panels comply with the

requirements of relevant IEC standards.

5.4.3 Casting

Casting shall be true to pattern, workmanlike finish and of uniform

quality and condition, free from blowholes, porosity, hard spots, and

shrinkage defects, cracks or other injurious defects, shall be

satisfactorily cleaned for their intended purpose.

5.4.4 Welding

Wherever welding is specified or permitted, a welding process,

including stress relieve treatment as required if necessary, conforming

to an appropriate and widely recognized professional standards shall

be used. All welders and welding operators shall be fully qualified by

such a standard.

5.4.5 Colour standards

The final colour of each item shall be as described under each item.

5.4.6 Operational Details

Instructions shall be engraved on the switchgear panel, on the circuit

breaker compartment describing in simple steps how to carry out

correct and safe isolation, racking –in and racking-out Switching

operations on the circuits breaker. Similar details should be provided

for the operation of the earth switch.

5.5 Protection, cleaning and painting

5.5.1 Embedded steelwork

All parts to ultimately be buried in concrete shall be cleaned and

protected before leaving the manufacturers plant by cement wash or

other approved method. Before being installed they shall be

49

thoroughly desiccated and cleared of all rust and adherent matter, or

be treated according to a method approved by the Employer. Such

cleaning or treatment shall not detrimentally affect the strength or final

operation and function of the equipment.

5.5.2 Steel exposed to atmosphere

(a) All machined parts or bearing surfaces shall be cleaned and

protected from corrosion before leaving the manufacturers plant by

the application of an approved rust preventive coating, or a peel able

plastic film. Where the latter is impracticable, such parts shall be

heavily covered with high melting point grease. After erection such

parts shall be cleaned with solvent and lapped or polished bright.

(b) All parts, other than machined parts, which will be exposed after

erection shall be thoroughly cleaned and galvanized or given with two

coats of best quality approved primer and a further one coat of paint

of an approved quality and colour after erection and touching up on

the site, expect such apparatus as panels and instruments which shall

be finished painted under approved procedures.

(c) All outside panel surface shall be primed, filed where necessary, and

given not less than two coats of synthetic undercoat. The finishing coat

outdoor indoor installations shall be a gloss paint.

(d) Primer shall be applied to surfaces prepared in accordance with the

plant manufacturer’s instructions. The surface shall be wiped clean

immediately prior to applying the paint. The primer and finish coats of

paints shall be applied using the methods and equipment

recommended by the manufacturer.

(e) The internal surface of all pipelines shall be cleaned out by the

approved methods before installation and again prior to

commissioning, to ensure freedom from dirt, rust, scale, welding slag,

etc. all exposed pipes shall be painted with an identifying colour after

erection is completed. The colour code system shall be approved by

the employer.

(f) All steel surfaces, which are in permanent contact with oil, shall be

given three coats of approved oil resistant.

(g) No painting or protection is required for finished or unfinished stainless

steel parts.

(h) The final colour of all equipment’s, frames for meters and relays, and

switch handle shall be as described under each particular item.

(i) The humid and tropical conditions shall be taken into account on

selection of paints and painting procedure.

5.6 Drawings

(a) Before starting manufacture of the switchgear panels, dimensioned

drawings and data showing all significant details of the equipment and

50

materials to be used shall be submitted to the employer for approval.

Four 4 weeks shall be allowed for Review of the drawings by the

employer. The employer shall indicate on the drawings whether the

drawings are Approved, Approved with comments or Not Approved.

Where the drawings are not approved, the manufacturer shall modify

the drawings as per the Employers comments and in line with the

specifications and re-submit to the Employer for review. Manufacturing

of the switchgear panels shall not commence under any

circumstances without receipt of Approved drawings by the

manufacturer from the employer. Any delays in approval of the

drawings caused by submission of incorrect drawings by the

manufacturer shall be the responsibility of the manufacturer, who shall

fully offset any associated costs.

(b) The manufacture of the switchgear shall then proceed strictly in

accordance with the approved drawings and also in accordance with

the detailed specifications as contained herein. Where conflict may

arise between the specifications and the approved drawings, the

specifications shall take precedence, unless it's specifically indicated in

writing on the approved drawings that the conflicting clause in the

specifications is superseded, or where following discussions between

the manufacturer and the employer, the employer gives approval in

writing to supersede the conflicting clause in the specifications.

(c) It is to be understood, however, that approval of the drawings will not

relieve the manufacturer of any responsibility in connection with the

works that the switchgear will fully comply with the relevant IBC/ANSI

standards and with these specifications.

(d) All drawings submitted for approval or sent to the Employer for any

other reason shall be in hard copy form sent via courier or other means.

Drawings for Approval shall not by any means be forwarded via e-mail

or any other media except in hard copy form.

(e) On successful completion of the initial FATs and following completion

of the manufacture of the complete switchgear panels, the

manufacturer shall carry out all the tests listed under section 6.13 for the

completed switchgear panels and for current transformers, voltage

transformers, circuit breakers and for protection relays. The tests shall be

carried out on each and every switchgear panel. Any problems noted

will be rectified and the Employer will only be invited to the factory

when all the tests are successful. This will ensure that the employer does

not spend time in the factory waiting for the manufacturer to fix

problems that arise during the FATs, while such anomaly would have

been detected and rectified by the manufacturer beforehand after

conducting the above routine tests

(f) Upon testing of the panels as in e) above, the drawings will be edited

to capture any minor wiring errors detected in order to produce the

final as built drawings. A copy of the final As Built drawings and Routine

51

test results for each panel, signed by the manufacturer shall be sent by

courier to the employer before attendance of the FATs.

(g) Each individual switchgear panel shall have it's own separate drawing

supplied with the panel.

(h) Before Approval of shipment of the switchgear panels, Fourteen (14)

copies of bound As Built drawings (A4 size) in Hard Copy shall be

forwarded to the employer in Durable Hard Cover Box Files. The files

shall have a tag with the following Inscription.

Kenya Commercial Bank Ltd

11kV protection & Metering Switchgear Panels

Year 2015

AS Built Drawings

File No. 1-14

Also Seven (7) software copies (in CD ROM) of the As Built drawings in

AutoCAD Electrical 2010 SLM or later version shall be sent to the

employer via courier. The CD ROM will have the same label as above.

The drawings provided on soft copy shall be freely editable to allow the

employer to incorporate any changes made in future.

All protection and control drawings shall be done on A4 - size paper.

The function of each drawing shall be clearly indicated. Related

drawings shall be arranged sequentially, and have the same drawing

number/name but different sheet numbers. The drawings shall include

the following;

Switchgear panel drawings:

AC single line drawing

AC Schematics

DC Schematics

Functional Drawings

Panel wiring drawing

Panel device layout drawing

General layout drawing for the switchgear panel

Relays and device list (bill of quantities) for the panel with

complete details.

5.7 Manufacture of sample panels

Following the Approval of the drawings, the manufacturer shall initially

manufacture one sample panel. Upon manufacture of the panel, the

manufacturer shall invite the Employer to inspect and conduct factory

acceptances tests (FATs) on the panel. The manufacturer shall then

rectify any minor defects noted during these initial FATs. Upon

successful initial FATs, the Employer shall authorize the manufacturer to

proceed with manufacture of all the other Switchgear panels.

Where the manufactured sample panel is unsatisfactory and the

manufacturer fails to rectify the switchgear panel to satisfactory

52

standard within four weeks after attendance of the initial FATs, the

Employer shall have the option to cancel the tender.

5.8 Operating and maintenance instructions

(a) The manufacturer shall supply detailed instruction manuals concerning

the correct manner of assembling/installing, configuring, setting, testing

and commissioning, operating and maintaining the equipment and

devices constituting the switchgear board, including the board itself.

The maintenance details of each component shall also be described,

including the frequency of inspections and lubrication.

The instruction manual shall include a separate and complete section

describing the normal and emergency operating procedures for the

switchgear, and shall include explanatory diagrammatic drawings to

facilitate understanding of the instructions.

(b) The manufacturer shall, in preparing the instruction manuals, take into

account the lack of experience and familiarity of the operators with

this type of equipment

(c) The manual shall give specific information as to oil, grease, or any other

materials needed for maintenance operations. This information shall

include brand names and manufacturer's numbers or designations for

at least two brands available in Kenya, preferably manufactured in

Kenya.

(d) One complete set of the operating and maintenance manuals for all

the plant, equipment and accessories to be installed/mounted in the

switchgear panels shall be sent to the employer together with the

drawings for approval. The operating and maintenance manuals shall

be original copies printed and bound by the manufacturer. Any

illegible copies of the operating and maintenance manuals submitted

shall be rejected by the employer.

(e) Before approval of shipment of the switchgear panels, Fourteen (14)

Copies of the operating and maintenance instructions/manuals shall

be sent to the employer by courier. The operating and maintenance

manuals shall be original copies printed by the manufacturer. Any

illegible copies of the operating and maintenance manuals submitted

shall be reject by the employer.

5.9 Testing at place of manufacture

(a) The manufacturer shall be responsible for performing or for having

performed all the required tests listed in clause 6.13 of this specification

for the switchgear and the current transformers, voltage transformers,

protection relays, energy meter, measuring and indicating instruments.

(b) The tenderer shall confirm the manufacturer's capabilities in this regard

when submitting the tender. Any limitations shall be clearly specified.

53

(c) Tender documents shall be accompanied by copies of Type test and

Routine test reports &certificates for similar rated equipment for the

purpose of tender evaluation. Type test reports & certificates shall be

certified by the National Standards and Testing Authority (NSTA) of the

country of origin or by a third party Reputable Testing Authority. Where

a body other than NSTA is used to certify the type-test reports, a copy

of the certificate of accreditation shall be attached. Current contact

information of the testing and certification authority shall be provided.

(d) Upon completion of the manufacturing process, routine tests shall be

carried out as per the respective IEC standards of each equipment as

follows:

Circuit Breaker IEC 62271-100 & IEC 60298

Switchgear panels, IEC 60294

Current Transformers, IEC 60044-1

Voltage Transformer, IEC 60044-2

Protection Relays and Measuring and Indicating Instruments, IEC

60255

(e) The manufacturer shall arrange for (two) 2 engineers from the

employer to attend Factory Acceptance Tests (FATs) on the Switchgear

panels, where all routine tests as per the IEC standard listed above and

as listed under clause 6.13 in this specifications shall be carried out in

their presence. The duration of the FATs shall be adequate to test all

the offered switchgear Panels. Testing shall strictly be carried out during

working hours from 8.00 am to 5.00 pm.

(f) In case the equipment fails the test and has to be rectified or the

manufacturer is not able to complete the tests within the set duration,

then the manufacturer shall meet the cost of

(g) Accommodation and meals and any other associated tests for the

Employer's Engineers for the additional days required for completion of

the tests.

(h) The employer's engineers will only sign the Tests Reports/Certificates

when the tests are

(i) Conducted in their presence in accordance with the relevant IEC

standard or the procedure agreed beforehand between the employer

and the manufacturer.

(j) Only upon receipt of authentic certified copies of the FATs Routine Test

Reports/certificates and special tests and satisfactory report from the

Engineers, shall the employer give clearance for shipment of the

switchgear panels once all the other listed requirements on drawings,

operation and maintenance manuals and software have been met.

54

5.10 Software requirement

(a) Seven (7) copies of the Protection Relay Software in a CD Rom, shall be

supplied with the Switchgear panels. Eight (8) PC to Relay connection

cables shall also be supplied with the switchgear panels.

(b) Before approval for shipment of the switchgear board is granted by the

employer, all the software indicated in the completed technical

schedules shall be supplied. The software shall be for configuration,

parameter setting and for data download and analysis.

(c) It shall be possible to load the software into at least ten (10) different

laptop computers without requirement for additional licenses. Where

additional licenses are required, the cost shall be considered to have

been included in the bid.

(d) Seven (7) sets of hard cover manuals for each type of software

supplied providing detailed instructions for programming settings and

configuration of the relays and other devices and downloading of

data shall be supplied with the switchgear panels.

5.11 Spare parts

(a) The manufacturer (bidder) shall furnish spare parts as listed below and

included in the price schedules:

i) Five (5) circuit breaker spring charging motors

ii) Ten(l0) circuit breaker closing coils

iii) Ten(10) circuit breaker tripping coils

iv) Four(4) circuit breaker interlocking coils

v) Four(4) earth switch interlocking coils

vi) Ten(10) indication lamps of each type

vii) Four(4) auxiliary relays of each type

viii) Four(4) protection relays

ix) Four(4) MCBs of each type

x) Four(4) power measurement units

xi) VT Fuses: Twelve (12) for primary side and Twelve (12) for

secondary side for each switchgear panel

xii) One set of three phase Current transformers

xiii) One set of three phase voltage transformers.

(b) The spare parts supplied shall be packed or treated in such a manner

as to be suitable for storage under the climate conditions at the site for

a period of not less than two years, and each part shall be clearly

marked with the description and purpose on the outside of the

package. The manner of storage shall be recommended by the

manufacturer.

(c) Spare parts so provided shall be delivered with the switchgear to the

employers’ stores. Delivery of spare parts will not be deemed to be

complete until the packages have been opened and their contents

checked and verified by a representative of the employer.

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5.12 Accessories for the switchgear panels

The following accessories shall be supplied with each separate

Protection and Metering

Switchgear panel:-

(i) One (l) circuit breaker rack in/rack out handle/tool

(ii) One (I) circuit breaker manual spring charging handle/tool

(iii) One (l) earth switch operating handle/tool

(iv) Seven (7) Circuit Breaker withdrawal trolleys, where required, for

the complete order of switchgear panels

5.13 Packing

(a) The switchgear panels and spares shall be packed properly and

protected for shipment from the place of manufacture to the

employer's stores.

(b) Each crate of package shall contain a packing list in a

waterproof envelope and a copy in triplicate shall be forwarded to the

employer prior to dispatch. All items of material shall be clearly marked

for easy of identification against the packing list.

(c) All cases, packages, etc., shall be clearly marked on the outside to

indicate the total weight, to show where the weight is bearing and the

correct position of the slings and shall bear an identification mark

relating them to the appropriate shipping documents.

(d) Bolts, nuts, washers and fillers shall be bagged in sealed vinyl and

packed in steel cans. The cans shall bear the contents and be

crated together.

(e) The Employer shall reserve the right to inspect and approve the

equipment and the packing before the items arc dispatched.

However the manufacturer shall be entirely responsible for ensuring

that the packing is suitable for transit and such inspection will not

relieve the manufacturer from responsibility for any loss or damage

due to faulty packing.

(f) Consignee: KENYA COMMERCIAL BANK LTD.

(g) Name of Project: 11KV PROTECTION & METERING SWITCHGEAR

PANELS.

(h) Contract No.:…………………………………………………………………

(i) Port of destination:……………………………………………………………

(j) Item Number, if applicable, Package number in sequence, and

quantity per package:………………………………………………………

(k) Description of Contents:……………………………………………………….

(l) Net and gross weight, cubic

measure:…………………………………………..

(m) The shipping mark is finally subject to the Employer's approval

5.14 Delivery

a) The manufacturer shall deliver the switchgear and spares to the

designated employers’ stores.

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b) The notification for shipment/delivery shall include a complete

shipping list of the contents of each package to be delivered and shall

indicate the anticipated date of delivery and the serial number for

each component to be used for identification and evidence of the

insurance cost arranged for it.

6 DETAILED TECHNICAL SPECIFICATIONS FOR 11 KV METAL CLAD

INDOOR PROTECTION & METERING SWITCHGEAR PANELS.

6.1 Scope

This specification is for 11kV Indoor, three pole, metal clad switchgear

panels with vertical or horizontal isolation, horizontal draw out with circuit

breaker employing vacuum interrupter.

6.2 References

The following documents were referred to during the preparation of this

specification, and may be referred to; however in case of conflict, the

provision of this specification shall take precedence.

Unless otherwise specified, the latest revision, edition and amendments

of the standard shall apply

IEC 60298: AC metal - enclosed switchgear and control gear for

rated voltages above 1 kV and up to 72.5 kV

IEC 60051 ` Direct acting indicating analogue electrical

measuring instruments and their accessories.

IEC 62700- 100 High-voltage alternating circuit

breakers.

IEC 60044-1: Current transformers

IEC 60044-2: Voltage transformers

IEC 60255: Electrical Relays

ANSI 37: Medium voltage AC metal – enclosed

switchgear and control gear

6.3 Construction of each panel

(a) The whole switchgear equipment’s and components shall be

designed and constructed in accordance with IEC 60298. The panels

shall be complete with all the relevant components including, busbars,

circuit breaker, cable compartment, instrument transformers, protection

relays, instruments and controls.

(b) The switchgear panel, shall be constructed to 1P43 degree of

protection in accordance with IEC 60529. A type test report for the

degree of protection of the switchgear panels from a third party

reputable testing laboratory or certified by the national standards and

57

testing authority (NSTA) or a laboratory accredited to the NSTA shall be

submitted with the tender for evaluation purposes.

(c) The panels shall have restricted dimensions suitable for installation

in limited spaces. In particular and without compromising the insulation

level, bus - bar current rating and short circuit current performances,

the width of the panels shall not exceed 900 mm.

The LV compartment shall not be less than 550 mm in height, to ensure

adequate space for mounting the relays and other devices and

accessories and adequate space for the cable trucks, terminal blocks

and wiring.

The depth of the switchgear, i.e., from the front to the back shall be

kept to the minimum and in any case not exceeding 2500 mm.

For ease of transportation, the metering compartment can be

delivered loose with each panel together with all mounting accessories

for installation at site. Provision shall be made for entry of cables from

the current transformers and the voltage transformers into the metering

compartment. The metering compartment shall have a glass window

through which the readings for the energy meter can be viewed and

accessed, without opening the compartment door. The compartment

door shall be provided with padlocking and sealing facilities. The

design of the cubicle shall be to the approval of KCB. The overall

height of the protection and metering switchgear panel with the meter

compartment installed shall not exceed 2800 mm.

(d) The switchgear panel or cubicle shall be built up of separate metal

clad-compartmented cubicles with earthed metal partitions. The

compartments shall be for busbar, Incoming cable connection,

outgoing cable connection, circuit breaker, current transformer and

control(LV) and energy meter compartments. A drawing showing the

layout and dimensions of each of the compartments of the switchgear

panel and the devices/components installed in the compartment shall

be submitted with the bid for tender evaluation. NB: The incoming and

outgoing cables may be located in the same compartment.

(e) The circuit breakers shall be mounted on an inbuilt carriage to

facilitate isolation and withdrawal of the circuit breaker. Where the

carriage is fixed in the compartment and does not allow complete

withdraw of the circuit breaker outside it's compartment, then a

purposely built trolley shall be provided equipped with a

lowering/raising gear to lower the circuit breaker to the floor, and to

raise the circuit breaker to it's compartment by one person. This

requirement shall be demonstrated during FATs. Seven (7) such trolleys

shall be provided with the switchgear panels.

(f) The complete switchgear panel shall be such that the complete

switchboard is of flush-front design.

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(g) Each of the switchgear panels shall have five separate

compartments as follows :-

i) Energy meter compartment

ii) LV Compartment

iii) Circuit Breaker Compartment

iv) Busbars Compartment

v) Incoming & outgoing Cables, CTs and VTs compartment

The circuit breaker, busbars and cable compartments shall be

provided with arc venting outlet to the top of the switchgear board.

(h) The low voltage section shall be completely separate from the

high voltage section. All the protection relays, auxiliary relays, energy

meters indication lamps, instruments, control and selection switches and

any other associated accessories will be mounted in this compartment.

(i) The switchgear shall be designed for erection with the rear side

close to a wall as well as for free standing erection. The manufacturer

shall provide a single line layout drawings giving the required minimum

dimensions of the switchgear room, and showing the cable trenching

requirements.

(j) The switchgear shall be of arc resistant design as per IEEE/ANSI

C37.20 and hence ensure complete safety for a switching personnel

standing in-front or at the rear of the switchgear board. A copy of the

type test report shall submitted with the bid for tender evaluation

purposes.

(k) The cables compartment shall have an anti-vermin guard plate

giving protection against entry by rats, rodents etc.

(l) The circuit breaker compartment, the CT compartment, the LV

compartment, the VT compartment and the Energy meter

compartment shall be provided with facilities four padlocking and

sealing.

(m) The doors for the compartments shall be capable of withstanding

the effects of maximum internal arcing fault without being blown off

and causing danger to personnel and other equipment. This should be

proven by successful testing, as per ANSI C37.20.7 or equivalent IEC

standards. Type test report shall accompany the bid.

(n) The busbar shall be single, three phase, air insulated. The primary

busbars and connections shall be of high conductivity and electrolytic

material, high grade copper, and shall be in unit lengths. The busbars

and other circuit connections shall have a PVC cover to prevent

accidental short-circuits.

(o) Busbars, connections and their support shall be rated 630 A

continuously under ambient conditions and capable of carrying the

59

short-time current associated with the short circuit ratings of the circuit

breakers, for 3 seconds.

(p) Provision shall be made for locking busbar and circuit shatters

separately in the circuit breaker compartment. These shutters shall open

and close automatically during the racking in and racking out of the

circuit breaker.

(q) Provision shall be made for integral circuit earthing and for busbar

earthing. Means of earthing shall be by circuit breaker or purposely built

earth switch. Mechanical & electrical interlocks to ensure correct

switching operation shall be provided. It shall not be possible to close

the earth switch when the incoming 1lkV cable is live and the VTs are

energized. The earth switch shall be equipped with a blocking coil

energized when the VTs are energized or any other suitable

arrangement. It is preferred that earth switch be provided both on the

incoming and outgoing cable circuits.

(r) The earth switch shall be easy to operate by one operator and be

spring loaded to ensure effective make operation independent of the

operator action. The earth switch shall be rated to make and carry for

3 seconds, the rated short-circuit current of the switchgear panel of 3 1

.5 kA.

The Status of the earth switch shall be visible from the front of the Panel.

It shall not be possible to rack-in the circuit breaker into the service

position with the earth switch in closed position. The mechanical

interlock between the circuit breaker and the earth switch shall be

strong enough and not easily defeated to guarantee safety of the

switching personnel and the switchgear.

The earth switch shall be equipped with auxiliary contacts for local and

supervisory indication of the status of the earth switch. The earth switch

operating lever shall be covered by a shutter and shall only be

accessible when it is permitted to operate the earth switch.The

operation of the Earth Switch shall be set in such a way that during

both the close and open operations, a clearance of at least 9 inches

shall be maintained between the operating handle and the bottom of

the switchgear panel.It shall not be possible to insert the earth switch

operating handle into position except when the circuit breaker is in the

test or isolated position. The earth switch shall be equipped with

padlocking facilities when in the closed position.

(s) All earthing facilities shall be rated for fault making at the rated

switchgear short-circuit current.

(t) The Panel wiring for protection, instruments, indication and

metering circuits and other control accessories shall be completely

done. All circuits for connection to external cables such as DC & AC

auxiliary supplies, external tripping, supervisory control and indications

shall be wired up to the terminal Block at the Back of the panel where

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external cables shall be connected. At least 12 spare terminals shall be

provided on the terminal board for any future requirement.

(u) It is emphasized that each switchgear panel will have a terminal

block at the back of the panel where all external cables such as for 30V

DC supply, 240V AC supply, connection of SCADA,

measurands/commands and alarms shall be made.

(v) 30V DC, 1 10V AC and 240V AC supplies for circuit breaker control,

alarm circuits, protection relays, metering and motor supply for each

panel, shall be controlled by suitably rated miniature circuit breakers.

(w) The switchgear panels shall be tropical vermin proof. The plates

shall be of high quality mild steel of at least 2mm thickness thoroughly

cleaned by shot blasting or other approved methods. They shall then

be given a primary coat and two coats of contrasting colour of durable

and weather resisting paint. The final coat shall be gloss and of RAL

7032. The final thickness of the paint shall not be less than 80 Microns at

any point within the switchgear panel. The paint thickness shall be

measured during the Factory Acceptance Tests.

(x) Anti-condensation heaters shall be provided inside each

switchgear panel. They shall be located so as not to cause injury to

personnel or damage to equipment. The heaters shall be controlled by

a hygrostat with a variable humidity and temperature setting. The

heaters shall be dimensioned to ensure that condensation cannot

occur within the switchgear panel. Heaters of adequate rating shall be

provided for the circuit breaker, cable and LV compartments.

The 240V AC supply, for the heaters shall be controlled by a suitably

rated single pole miniature circuit breaker.

(y) The circuit breaker cubicle shall have a limit switch which shall be

used to indicate whether the breaker is fully racked in or fully racked out

(withdrawn). This shall be indicated on the relay MIMIC.

(z) All the switchgear panels shall be rodent and vermin proof.

(aa) Suitable means shall be provided to monitor the status of the HV

cable, i.e., whether it is live or dead. The monitoring device shall be a

three phase device with illumination in red colour for live status visible

from the front of the panel without opening any compartment doors.

The indications shall be labeled R, Y & B or LI, L2 & L3. The device shall

meet the requirements of IEC 61243-5. This shall be provided for both the

incoming and outgoing cables.

(bb) Each switchgear panel shall be provided with Tinned Copper

earth bar of adequate cross section area to be able to withstand the

rated short-circuit current of 31.5 kA for 3 seconds. Provision shall be

made for connection of the switchgear panel earthing bar to the

substation earthing grid.

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(cc) Manual close & open push buttons shall be provided on the circuit

breaker compartment door for manual close and open of the circuit

breaker both in the service and in the test (withdrawn) position. The

manual close and open push buttons shall be clearly labeled with

CLOSE and OPEN Labels and with I(red) and O(Green) Symbols and

colour codes as per the IEC standard.

6.4 Circuit breakers

Circuit breakers shall preferably be SF6 type. SF6 breakers shall use the

SF6 gas confirming to IEC or other approved standard as the insulating

medium as well as for arc quenching. The circuit breakers shall be

suitable for an operating sequence of O-0.3 sec.-CO-3 min-CO.

Circuit breakers shall comply with IEC standard 62271-100 and IEC

60298.

The Circuit breakers shall have valid type test report based on the

above standard conducted on an independent test lab or witnessed

by independent observers. Evidence of type test report as per the

standard shall be submitted along with offer. The capacitive

current switching, line charging and cable charging current, restrike

performance, mechanical & electrical endurance, making and

breaking current etc. shall be as per IEC 62271-100. The circuit

breakers shall have first pole to clear factor of 1.5.

The transient recovering voltage performance shall be as per IEC. All

circuit breakers whether cable or others shall be suitable for auto

reclose duty and the requirements of pole discrepancies during

closing and opening operation shallcomply with IEC 62271-100.

The circuit breakers shall be complete with high integrity operating

and isolating mechanisms, primary and secondary disconnecting

devices, auxiliary contacts, manual tripping facilities, operations

counter, mechanical position indicator, control wiring, auxiliary relays

and contactors as required.

The offered circuit breakers along with operating mechanism shall be

type tested for mechanical endurance class M2.

If the circuit breakers are not type tested as per the IEC 62271-100, the

new type tests shall be conducted preferably in an independent test

laboratory. If tests are performed on manufacturer’s premises, the tests

shall be witnessed by independent observers. The above tests shall be

conducted without any cost implication to KCB.

6.4.1 SF6 Circuit breakers

Circuit breakers employing SF6 gas as an interrupting medium shall

operate on the principle of self-generated gas pressure or rotating

arc for arc extinction. Means of confirming the existence of

adequate gas density in the circuit breakers shall be available

62

without removing the unit from service. The system of gas monitoring

shall be temperature compensated and with sufficient contact for

alarm and lockout.

Absorption of moisture and the decomposition products of the gas

shall be achieved by integral filters.

The circuit breaker shall be of the single pressure puffer type. The

circuit breaker shall be of the phase segregated design where each

phase is enclosed in its own gas compartment. Circuit breakers of the

single pressure puffer type or rotating arc will be considered.

All materials used shall be carefully chosen to ensure that they will not

deteriorate in the presence of the by-products of arcing and will not

absorb moisture. A suitable absorbent shall be fitted into the

enclosure of each phase adequately sized to ensure that the

moisture content of the gas is maintained below guaranteed values

for the service life of the unit or between maintenance periods as

applicable. Interrupters incorporating separate main and arcing

contacts shall be arranged such that any re-ignition or restrikes always

occur in the arcing zone between the arcing contacts.

Static and moving gas seals shall be designed to prevent the

leakage of gas or ingress of moisture throughout the service life of

the interrupting module. The leakage rate of gas shall not exceed

one percent per annum by weight for each module. If SF6 circuit

breakers are sealed for life they shall be guaranteed for a minimum

of 10 years normal duty. The gas system shall be monitored by a

temperature compensated pressure switch, which shall give an

alarm for abnormal pressure within any part of the circuit breaker.

The alarm shall be received before the gas pressure has reached a

level preventing safe interrupting of faults up to the design level of the

circuit breaker.

A second pressure switch shall be provided to prevent electrical

operation of the circuit breaker when the gas pressure drops below

the level for safe interruption of faults up to the design level of the

switchgear. At this pressure the insulation properties of the circuit

breaker shall not be reduced.

A means shall be provided of evacuating and refilling the circuit

breaker with SF6 gas and the circuit breaker shall be provided with a

pressure gauge, which shall be clearly visible from the front of the

cubicle when the circuit breaker is in the service position.

The gas enclosures and all gas pipe work, gauges valves and the like

shall comply with the relevant clauses of the specification and be

of approved material and securely fixed so as to withstand the

maximum forces sustained during the circuit breaker operation and

gas evacuation/refilling procedures. Over pressure relief devices

shall be provided and shall be proved to be capable of allowing

63

the safe discharge of any excess pressure that may arise in service

however caused.

The circuit breaker shall be delivered to the site filled with SF6 gas at

the correct operating pressure but an additional quantity of SF6 gas

shall be provided sufficient to facilitate checks to the gas pressure

switch. Gas removed from the circuit breakers on site shall not be

re-used. The external coupling for gas evacuation and filling shall be

of an approved type which shall be self-sealing when external

coupling hoses are removed. In addition the gas system shall be

equipped with a hand operated isolation valve between the self-

sealing coupling and the circuit breaker gas system. The prices for

all such gas filling accessories and sufficient quantity of gas for filling

at site including two spare bottles with SF6 gas, gas filling plant etc

shall be deemed to be included in the tendered price and shall be

supplied for each substation switchboard separately.

All contacts shall be easily and quickly replaceable. Separate

arcing contacts or contacts with replaceable arcing tips shall be

provided to protect the main contacts from burning during

operation. The design of the arc control devices and the material

used in them shall be such that erosion caused by the arc during

the operation of the circuit breaker shall be as little as possible. Means

for measurement of contact erosion without major dismantling shall be

incorporated and an approved gauge shall be provided.

6.5 Current transformers

a) Current transformers shall be Cast Resin Type and shall be

accommodated inside the cubicle in a separate compartment or in

the same compartment as the cables.

b) The current transformers shall be in accordance with the requirements

of 1EC 60044-1and 1EC 60044-6 and shall have the specified accuracy

under load and short-circuit conditions and shall be able to withstand

the effect of short-circuit fault current rating of the switchgear, of 31.5

kA for 3 seconds.

c) Current transformers shall have a rated burden as specified, sufficient

for the connected Numerical Protection relays and Energy meter and

Power Measurement Unit. The CT shall not saturate under maximum

short-circuit conditions for the connected burden. The CT rated burden

shall however not be less than 15 VA.

d) The Manufacturer of the CTs shall be identified at the time of tender.

Copies of Type Test certificates and routine Test Reports/Certificates as

per IEC 60044-1 of CTs of similar rating and class verifying the class and

accuracy as well as the limits of error for the declared class similar to

those of the specified CTs shall be submitted with the bid for tender

evaluation purposes. The specified CTs must be within the product

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range of the manufacturer. A catalogue of the CT manufacturer shall

be supplied with the bid.

e) The current transformer shall have markings on the secondary and

primary terminals as per requirements of the IEC 60044-1 standard. The

markings shall be indelibly made. The secondary terminals shall have

screw type terminals.

f) Name plate for the current transformer shall be provided with all the

required details as per IEC60044-1 Standards, including :-

i) The manufacturer's name

ii) Serial number and a type designation

iii) Rated primary and secondary current

iv) Rated frequency

v) Rated output and corresponding accuracy class for each

secondary winding, Including the rated accuracy limit factor

and Instrument security factor for protection and metering

secondary windings respectively.

vi) The highest voltage of the equipment.

vii) The rated Insulation level

viii) The rated short-time thermal current (/g,) and the rated

dynamic current

ix) Class of Insulation

x) Rated continuous thermal current

6.6 Voltage transformers

a) The VT shall be of Cast resin, indoor, type mounted within the

switchgear panel. The VT shall be a three phase unit or consist of

three(3) single phase units

b) Voltage transformers shall be suitable for operation of the protection

relays and metering and shall be in accordance with the requirement

of IEC 60044-2.

c) The voltage transformer shall be three phase, five limb, star/star

connected and complete with HV fuses. Alternatively three single

phase units shall be installed and connected.

d) The Manufacturer of the VTs shall be identified at the time of tender.

Copies of Type Test certificates and routine Test Reports/Certificates as

per IEC 60044-2, of VTs of similar rating and class as the specified VTs

shall be submitted with the tender for evaluation purposes. The

Specified VTs must be within the product range of the manufacturer. A

catalogue from the VT manufacturer shall be included with the bid.

e) Name plate for the voltage transformer shall be provided with all the

required details as per IEC 60044-2 Standards, including :-

i) The manufacturer's name

ii) Serial number and a type designation

iii) Rated primary and secondary voltage

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iv) Rated frequency

v) Rated output and corresponding accuracy class for each

secondary winding,

vi) The highest voltage of the equipment

vii) The rated Insulation level

viii) Class of Insulation for the equipment

ix) Rated voltage factor and corresponding rated time.

x) The use each secondary winding and it's corresponding terminals

6.7 Protection relays

a) The LV compartment terminal block shall include a test switch (block),

which enables the CTs circuits to be isolated from the relay and

shorted without opening circuiting the CT, to facilitate relay testing in

situ and to allow for isolation of VT circuits, alarm and trip circuits

without disconnecting wires at the terminal block.

b) The Measurement relays shall be Flush mounted and of Numeric

Design, with event recording, Fault recording, power measurement,

and shall be in accordance to IEC 60 255.

c) Besides the communication port, the relays shall have a human -

machine interface facility (MMI) with LCD Screen where one can

easily access relay information.

d) Relay contacts shall be suitable for making and breaking the

maximum currents, which they are required to control in normal

service.

e) Operating time for auxiliary tripping relays shall not significantly affect

the overall fault clearance time, i.e., the auxiliary trip relays must have

short pick up time of less than 30ms.

f) Relay contacts shall make firmly without bounce and the relay

mechanism shall not be affected by Panel vibration or external

magnetic fields.

g) Relays shall be provided with clearly inscribed labels describing their

functions and IEC Device Function numbers. The labels shall be to the

approval of the Employer.

h) Relays shall be suitable for operation on the rated 30V dc supply and

within the allowed tolerances without use of dropping resistors or

diodes.

i) To reduce the effect of electrolysis, relay coils operating on DC shall

be so connected such that they are not continuously connected

from the positive pole of the station battery.

j) The relay Thermal rating shall be such that the fault clearance times

on any combination of current and time multiplier settings shall not

exceed the thermal withstand capability of the relay. (Max.fault

current = 31.5 kA).

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k) The relays shall be EMC 89/336/EEC compliant.

6.8 Indication and instruments

All instruments shall be flush mounted and shall be in accordance with

the requirement of IEC 5 I.

Each cubicle shall have the following indications.

One indicator lamp to show the breaker in closed position - RED

colour

One indicator lamp to show the breaker in open position - GREEN

colour

One indicator lamp to show breaker Auto-trip - Amber colour

The instruments shall be supplied as described under each panel in the

subsequent sections.

6.9 Power cable termination

Cable compartment design shall be suitable for heat shrinkable (or

equivalent) jointing application termination. The following provisions

shall be made:-

i) Three core single gland fabricated sheet steel cable boxes

complete with gland and armour clamp or any other suitable

arrangement suitable for receiving one (1) 11kV three core of

up to 400mm2 XLPE cable.

ii) The cable connection terminals shall be located at least 250

mm from the CT primary terminals.

6.10 Scope of supply for 11kv protection & metering switchgear panels

The Scope of supply for the 11kV Protection & Metering Switchgear

Panels is listed elsewhere in the tender document.

6.11 Labelling of the switchgear panels

Each Switchgear panel shall be assigned a distinct numerical number

for identification starting with number one (l) and also be marked with

the following letters, "PROPERTY OF KCB". The number and letters will be

embedded on a stainless steel plate of width not less than 5 cm. The

size of the number shall be at least 3 cm high. The stainless steel plate

shall be fixed to the panel using stainless steel bolts.

The size of the letters/numbers shall be at least 2 cm high. The

letters/numbers shall be of back colour on white background. The

stainless steel plate shall be fixed to the panel using stainless steel bolts.

The design of the label shall be submitted to the employer for review

and approval.

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6.12 Ratings of switchgear panel equipment

6.12.1 11 kV Circuit Breaker

Interrupting Medium Vacuum

Number of poles 3

Highest equipment Voltage 17.5kV

One minute power frequency withstand

voltage

38 kV

Impulse withstand voltage (B1L) 95kV

Frequency 50 Hz

Rated short time current 3 1 ,5kA

Rated short time making current (peak) 79kA

Rated Short circuit current withstand 3 1 .5 kA, 3 seconds

First pole to clear factor 1.5

Operating sequence 0-0.3 sec-co- 15 sec.-co

Auxiliary D.C. voltage for closing and

tripping coils

30V

Auxiliary a.c. voltage 240V AC. 50Hz

Tripping/closing coil auxiliary voltage 30 V DC

Spring charging motor supply 240 V AC

Rated normal Current for Busbar & Circuit 630 A

6.12.2 Current Transformers:

Ratings:

Rated Short time current (STC) withstand: 3 1 .5 kA for 3

seconds

Rated Voltage of the CT: 17.5kV

One minute power frequency withstand voltage: 38kV

Impulse withstand voltage: 95 kV

Rated maximum continuous current: 400 Amps

Ratio and class:

Core 1: C.T Ratio : 300-200-100/1 A

Class : 5P15

Core 2: C.T Ratio : 300-200-100/1 A

Class : 0.2

Burden : 15 VA

Core 3:C.T Ratio : 300-200-100/1 A

Class : 0.5

NB: Core 2 will for connection to the tariff energy meter and core 3 will

be for connection to the Power measurement unit.

6.12.3 Voltage Transformers:

Ratings:

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Rated Voltage of the VT: : 17.5kV

One minute power frequency withstand voltage : 38 kV

Impulse withstand voltage : 95 kV

Ratio: Corel, Core 2 :11000/√3:110/√3V: 110/√3V

VA :150VA

Class : 0.2 & 0.5

NB; The rated VA of 150 VA is for a three Phase unit. Incase three (3)

single phase units are supplied the minimum acceptable burden for

each is unit 50 VA.

The core 1(class 0.2) will for connection to the tariff energy meter and

the core 2 (class 0.5) for connection to the Power measurement unit.

6.13 Factory acceptance tests (FATs)

ALL the switchgear panels shall be tested in accordance with the

requirement of IEC 60298.

Tests shall be carried out on the circuit breakers as per the requirement

of IEC 62271-100.

Current transformers and Voltage transformers shall be tested in

accordance with the requirement of IEC 60044-1 and IEC 6044-2

respectively. The Protection Relay shall be tested in accordance with

IEC 60255

The following tests shall be carried out during the FATs, by the

manufacturer in presence of the KCB and AEL Engineers

6.13.1 Complete Switchgear Panel

(a) Dimensional Checks

(b) Operational Tests

(c) Primary Injection Tests

(d) Calibration Tests on Relays and Instruments

(e) Power frequency Withstand Test

(f) Megger Test

(g) Contact resistance test of Primary joints

(h) Lightning Impulse withstand test OR provide Type test report

(i) Power frequency Withstand Test on secondary Wiring

6.13.2 17.5 kV Circuit Breaker

Routine tests.

(a) Operation test.

(b) Dielectric Test on the main circuit.

(c) Dielectric tests on controls and auxiliary circuits.

(d) Measurement of resistance of the main circuit.

(e) Timing test

(f) Design and visual checks

(g) Tightness test

Type Tests: Submit copies of Type test Reports and Certificate.

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(f) Mechanical endurance test

(g) Temperature rise test

(h) Impulse voltage test

(i) Interrupting Capacity

NB: Copies of Type Test Certificates for similar rated Circuit Breakers and

Certified by National Standards and Testing Authority body or

Reputable Third Party Test Laboratory shall be submitted with the

Tender for Evaluation Purposes.

6.14 Current Transformer

Routine tests shall be carried out at the manufacturer's plant as per the

requirement of

IEC 60044-1, as listed below, in the presence of KCB and AEL Engineers.

(i) Polarity test and verification of terminal markings test

(ii) Ratio and phase angle error test (accuracy class; composite

error test)

(iii) Power frequency tests on primary and secondary windings

(iv) Power frequency withstand tests between sections (windings)

(v) Inter-turn over voltage tests

(vi) Partial discharge measurement

Certificates and type Test report for the following type tests shall be

provided during the FATs:-

(i) Lightning, Impulse voltage withstand test

(ii) Temperature rise test

(iii) Short time current test

(iv) Determination of Errors test

(v) Radio Interference voltage measurements (RIV)

6.15 Voltage Transformer

Routine tests shall be carried out at the manufacturer's plant during FATs

as per the requirement of IEC 60044-2, as listed below:-

(a) Polarity tests and verification of terminals

(b) Power frequency withstand tests on Primary windings

(c) Power frequency withstand tests on secondary windings

(d) Power frequency withstand tests between sections

(e) Determination of errors

(f) Partial discharges measurement

Certificates and type test report for the following type tests shall be

provided during the FATs:

(a) Temperature rise test

(b) Lightning Impulse Test

(c) Determination of errors

(d) Short-circuit withstand test capability

(e) Measurement of the radio interference voltage (RIV)

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6.16 Protection Relay Tests

(i) Relay Pick-up test for all functions and phases

(ii) Relay timing test for all functions and phases

All Protection & Metering switchgear panels and the equipment’s

therein shall be tested as listed above.

6.17 Training at the manufacturer’s place

During the FATs the manufacturer shall conduct complete training for

the following Equipment’s for at least two KCB Engineers

6.17.1 Feeder Protection and Control relay

The Training shall include:-

(i) Theory on application of all the functions included in the

relay

(ii) Complete configuration of the relay using software

including creation and editing of the switchgear Mimic on

the relay MMI

(iii) Relay parameter setting.

(iv) Downloading and analysis of all the data including

disturbance recording

(v) Installation and testing

(vi) Trouble-shooting and repair

(vii) Complete testing of all the relay

functions

The manufacturer shall plan adequate time for the training separate

from the FATs. The duration of the training shall however not be less

than two (2) eight hour working days. The employer may send a

separate team from the team witnessing the FATs to attend the

training.

The Training shall be considered to have been successful once the

engineers are able to carry out all the above activities on their own.

The manufacturer shall conduct evaluation tests and give a feedback

report on the training to the employer for each of the engineers.

6.18 17.5 kV Circuit Breaker.

The Training shall include

(i) Functions of the Circuit breaker

(ii) Installation checks and operational tests

(iii) Inspections, repair and maintenance

The manufacturer shall plan adequate time for the training separate

from the FATs. The duration of the training shall be at least one (1) day.

The engineers attending the FATs will attend this training.

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6.19 Training at site

The manufacturer shall conduct complete training for the following

equipment’s in Nairobi

Kenya

6.20 Feeder Protection and Control relay

The Training shall include:-

(i) Theory on application of all the functions included in the relay

(ii) Complete Configuration of the relay using software including

creation and editing of the switchgear MIMIC on the relay

(iii) Relay parameter setting

(iv) Downloading and analysis of all the data including disturbance

recording

(v) Installation and testing

(vi) Trouble-shooting and repair

(vii) Complete Testing of all the relay functions

The Training shall be conducted for Fifteen (15) Engineers and

Technicians. The manufacturer shall arrange for the complete Training

and pay for the venue and for meals and refreshments and any other

associated costs. The duration of the training shall be at least one (l)

day.

The training shall be considered to have been successful once the

engineers/technicians are able to carry out all the above activities on

their own. The manufacturer shall conduct evaluation tests and give a

feedback report on the training to the employer for each of the

engineer.

7 PROTECTION RELAYS, CONTROLS AND MEASURING DEVICES

REQUIREMENTS FOR SWITCHGEAR PANELS

7.1 General requirements

(a) The equipment for the control system shall be highly reliable, long -

lived and suitable for continuous operation.

(b) All instrument scales, coils, relay contacts and other features shall be

suitable for the Apparatus controlled or the purpose intended

(c) It shall be the manufacturer's responsibility to properly design the

electrical control, protective relaying, and alarm and indication

schemes related to the 11kV switchgear

(d) The Manufacturer shall prepare arrangement and detailed drawings,

equipment lists and wiring diagrams based on the requirements for

measuring instruments, relays, control switches, indicating lamps and

other devices including those to be supplied under other subsections

(e) Protection against electrical faults and abnormal conditions on 1lkV

switchgear panels and the outgoing cable circuit shall be conducted

by the protective relays and associated switchgear

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7.2 Bill of materials

The items listed under the bill of materials shall be installed and

connected to form a complete and safe working system. Any

components and accessories required to form complete safe and

correct working system, though not listed below shall be installed wired

and connected by the manufacturer and shall be deemed to have

been included in the bid and contract price.

7.3 Protection & metering switchgear panel requirements

The Protection & Metering switchgear Panels shall be equipped with the

following protection relays, measuring and indicating devices, controls

and other accessories.

(a) Protection and control relay. The relay must fully meet the requirements

of the detailed specifications included in this specifications.

(b) Trip circuit supervision (TCS) relay visible from front of panel without

having to open any panel compartment door. The TCS Relay shall be

offered as a separate relay and NOT as a function of the feeder

protection relay. Alternatively, the trip circuit supervisory function may

be included in the feeder protection and control relay provided that it

meets all the requirements of the specifications.

(c) Auxiliary Trip Relay

(d) A single power measurement unit shall be provided for each feeder

panel to capture Instantaneous and maximum demand values for the

following parameters; I, kV, MW, MVAR and p.f.

(e) Circuit breaker control switch (Close, Open &Neutral), with a

mechanical Lock

(f) Circuit Breaker ON (red), OFF (green) and auto-trip(amber) indication

lamps

(g) Anti-condensation heaters for the Circuit Breaker and the LV

compartments

(h) Hygrostat with separate humidity and temperature control setting to

control the heaters

(i) Door switch operated lighting point and bulb for the LV compartment

and the Meter compartment

(j) 3 Pin - square power socket outlet with red neon indicator

(k) Suitably rated MCBs for auxiliary 30V DC for control, 30V DC for Trip, 240

V AC or motor, 240 V AC for heaters and illumination and VT 1 10 V AC

supplies shall be fitted

7.4 Protection relays

7.4.1 References

IEC 60255: Electrical Relays

7.4.2 General requirements

(a) The electrical measuring protective relays shall be of Numeric design.

(b) Auxiliary relays, of Static or electromechanical designs, with

73

mechanical flag indicators are acceptable.

(c) The protective relays and auxiliary relays shall operate successfully for

any value of the DC supply voltage between 85% and 125% of the

rated voltage of 30V DC without exceeding the temperature rise limits

for the operating coils.

(d) Each Measuring protection relay shall be of the panel flush mounted,

back connected, type with rectangular case. Each relay shall have a

removable transparent cover or cover with a transparent window

making the front of the relay visible.

(e) Each protection relay shall be equipped with adequate electrically

independent contacts, of adequate rating for Trip and alarm functions.

The relay shall also have adequate number of LEDs to assign each of

the available protection functions. The number of LEDs shall not be less

than eight (8).

(f) Test facilities for each AC current secondary circuit so as to provide

access for testing of the protective relay and its associated circuits. This

shall be provided on the terminal block and will consist of isolation links

on the current transformer and voltage transformer circuits and suitable

terminals for insertion of test leads banana terminals for injection of

secondary current and voltage.

(g) Each current transformer circuit shall be earthed through a removable

link at one point only in the control compartment's terminal block. The

protection trip and alarm circuit for each panel shall be provided with

an isolation link to facilitate isolation of the trip or alarm circuit for

testing and trouble-shooting of the circuits.

(h) Relays contacts shall be suitable for making and breaking the

maximum currents, which they may be required to control in normal

service. Where contacts of the protective relays are unable to

deal directly with the tripping currents, Auxiliary Trip relays shall be

provided. This will ensure safety for the protection relays output

contacts.

(i) Relays contacts shall make firmly without bounce and the whole of the

relay mechanism shall be as far as possible unaffected by vibration or

external magnetic fields.

(j) Relays shall be provided with clearly inscribed labels on the surface of

the panel describing their application in words e.g., "Three overcurrent

& earth Fault relay" in addition to the IEC numbering.

(k) To minimize the effects of electrolysis, relay coils operating on DC shall

be so connected that the coils are not continuously connected from

the positive pole of the battery.

(l) The relay thermal rating should be such that the fault current clearance

times on any combination of current and time multiplier setting shall not

exceed the thermal withstand capability of the relay (Maximum Fault

current= 25 kA or 31.5 kA).

(m) The numerical relays will be equipped with an RS232

communication port to facilitate connection to a Laptop computer for

configuration and parameter setting. Also a communication port shall

74

be provided on each numerical relay for interface into a substation

control and monitoring system and for remote interrogation and

programming of the protection relays.

(n) The relays will also have an MMI with LCD screen and keypad to

facilitate manual relay programming and data access.

(o) Relay operation due to system fault, shall be indicated by a Red L.E.D.

and the fault details (flags) shall be displayed on the MMI. Both the

relay fault flags and red L.E.D shall be reset via reset push buttons

without opening the relay Cover.

7.5 Detailed specifications for relays, measuring and indicating instruments,

control switches and other accessories

These specifications indicate the required performance characteristics

for each of the Protection Relays and are in accordance with IEC 60255.

7.5.1 The Protection and Control Relay

This relay shall be installed on each Protection & Metering switchgear

panel and shall as a minimum meet the following requirements.

The Protection and Control relay shall be of numeric design

The Relay will have a large LCD screen measuring at least 7 cm x 7

cm where a mimic of the switchgear arrangement and status of the

switchgear for the bay shall be displayed. The position of the circuit

breaker, i.e., racked-in or withdrawn shall be indicated, as well as

status, i.e., whether open or closed as well as the status of the earth

switch. Circuit breaker close and open key buttons with symbols and

colour codes as per the IEC standards shall be provided on the relay

as well as switchgear selection key. A local/remote key selector

switch shall be provided on the relay and the selected status of the

selector switch indicated by means of an LED

The relay shall be equipped with a keypad for manual configuration

and parameter settings and for access of settings, fault and event

records.

The relay offered shall have at least the following protection

functions; - three phase overcurrent and earth fault, sensitive earth

fault, broken conductor, Over/under frequency, Over/under voltage

and thermal overload protection functions. All the protection

functions shall meet the requirements of each function as included

in these specifications.

The relay shall monitor measure and display on the screen the

following parameters; I, V, P, Q and p.f. Also the circuit breaker wear

shall be monitored and stored. The relay shall store at least 20 fault

records, 20 events and 6 oscillographic fault records.

It shall be possible to display instantaneous measurands on the

screen alongside the Bay Mimic.

The unit shall have a green L.E.D to indicate healthy status and a

red L.E.D to indicate

Operation (Trip) of the protection functions.

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It shall be equipped with a red L.E.D indicator to indicate relay

failure as well as output contacts to signal relay failure.

The relay shall have at least eight (8) programmable LEDs for

displaying protection and other alarms.

The Relay terminals shall be screw type terminals large enough to

accommodate at least 4mm² cable and shall be located at the

back of the Relay.

It shall be Equipped with an RS232 serial port for connection to a

laptop computer for configuration and setting of relay and control

functions and also for access of the relay data. Also a

communication port for connection to local area network shall be

provided. Seven (7) laptop to relay connection cables shall be

provided Fourteen (14) sets of Installation, commissioning, operation

and maintenance manuals shall be provided.

Fourteen (14) sets of Installation, commissioning, operation and

maintenance manuals shall be provided.

Software for relay configuration, parameter settings and data

download shall be supplied in CD ROM with the switchgear boards.

Seven (7) copies (CD ROMs) of Software shall be supplied. Eight (8)

PC to Relay connection cables shall be supplied with the

switchgear pan

NB: The Protection Functions Offered in the feeder protection and

control relay shall satisfy the detailed specifications for each of the

functions, detailed below:-

7.5.2 Three phase overcurrent and earth fault relay

Should incorporate the following Features;

Relay must be of Numerical Design

Shall be suitable for mounting on the panel front.

Current setting range for overcurrent relay 0.5In-2.4In

Current setting range for earth fault relay 0.05In-0.8In

I.D.M.T characteristics according to BS142 or IEC255 i.e. SI, VI. EI, LTI,

including definite time for the high-set Elements.

Time setting multiplier 0.05 - 1.0

Broken conductor protection feature

Highest Element for both overcurrent and earth fault with.

Protection, with a setting range of l-30In and a definite time delay

setting of 0-60 Seconds.

Circuit breaker maintenance

Fault records and event records

Trip and start contacts shall be freely configurable to the output

relays.

Drop off /pickup ratio >90%

Low transient overreach < 10%

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7.5.3 Sensitive Earth Fault Relay.

Should incorporate the following Features;

Relay must be of Numerical Type

Current setting range for earth fault relay 0.0l0In- 0.8In

Definite time delay characteristic; setting range, 0- 30 Seconds.

Circuit breaker maintenance

Fault records, event records and disturbance records.

Drop off /pickup ratio >90%

Low transient overreach < 10%

7.5.4 Trip relay

High burden tripping relay, immune to capacitance discharge

currents and leakage currents

At least 4 pairs of outputs contacts two of which should be NC

contacts

Instantaneous operation, t <20 ms

Flag or target shall be a red L.E.D, durable bulb or red mechanical

flag

The relay shall be suitable for flush mounting

The relay shall be electrical reset, complete with the rest button

Relay Terminals-shall be screw type terminals large enough to

accommodate at least

4mm² cable and shall be located at the back of the relay

Relay terminals shall be clearly marked

Relay contacts configuration shall preferably be drawn on the relay

casing

7.5.5 Trip circuit supervision Relay

The relay shall have the following features

Continuous supervision of trip circuit for circuit breaker in both OPEN

& CLOSED positions

Trip circuit fail - Red L.E.D or Flag

Trip circuit healthy - green L.E.D or no flag

Suitable for panel surface mounting; However if mounted inside the

control compartment, then the relay must be visible from the front.

Two(2) normally closed (NC) and two (2) normally open (NO) or

2NO/NC output contacts

Relay Terminals-shall be screw type terminals large enough to

accommodate at least

4mm2 cable and shall be located at the back of the relay

Relay terminals shall be clearly marked

Relay contacts configuration shall preferably be drawn on the relay

casing

7.5.6 Circuit breaker Close/Open control Switch

The switch shall have a mechanical interlock to prevent accidental

operation of the switch.

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It shall have a close, neutral and open positions engraved on the

switch, black letters on white background. After an operation, the

switch shall return to the neutral position by spring action.

The terminals of the switch shall be screw type and shall be indelibly

marked.

7.5.7 Moulded Case Circuit Breakers

Three phase unit with Auxiliary contact

Rated operating voltage, 400V AC

Rated Insulation voltage 600V AC

Rated frequency 50 HZ

Setting value of Thermally delayed Overload release, 3 A

Auxiliary switch should have 1 NC & 1 NO contact.

Suitable for fixing on a DIN rail

Terminals suitable for connection of at least 4 mm2 cable

7.5.8 Anti-condensation Heater

The heater should be suitable for mounting inside the circuit

breaker, the cable and the LV compartment.

The Heater for each compartment shall be adequately rated to

preventing condensation within the respective compartment.

7.5.9 Indicating Lamps

Shall be suitable for mounting on the front of the panel

The Lamp Indicators should be rated for 130V DC and equal or less

than 2.5 rating.

The lamp indicators should designed for continuous operation and

give a long life of at least 10 Years.

The bulb shall be easily replaceable without using a special tool.

The Lamp Indicators shall be of LED design.

7.5.10 Power Measurement Unit:

This is a power monitoring meter for panel mounting

The unit shall be of numerical design

The unit shall have a large LCD display for displaying the

measurements

The unit shall measure instantaneous values of ; rms voltage, both

phase - phase and phase to ground, currents, active reactive and

apparent power, energy, frequency, power factor and phase angle

per phase

The unit shall the following input ratings, 1 A and 110V AC phase to

phase.

The unit shall be for flush mounting on the front of the panel

The unit shall be for 3 phase, 4 -wire connection on the secondary of

current and voltage transformers

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The unit shall be equipped with an RS232 port for programming the

unit to ensure correct measurement and display of the parameters.

The CT and VT ratios shall be programmable.

The accuracy of measurement shall be at least class 1.0

It shall be possible to display all the measured parameters on the

screen through the pre-programmed display screen. The screen to

be displayed shall be selectable using the keys on the front of the

unit

The software and the PC to measurement unit connection cable

shall be supplied with the unit.

The LCD screen shall be large enough to accommodate at least

three measurands simultaneously

All the terminals shall be clearly marked

The measurement range for power shall at least be up to 45 MVA.

The measurement unit terminals shall be screw type, large enough

to accommodate 4mm' cable and indelibly marked.

7.6 LV switchboard specifications

7.6.1 General

The low-voltage switchboard shall comply with standard IEC 439 - 1/BS 5486.

The degree of protection in compliance with standard IEC 529 shall be: IP31.

Kenya Bureau of Standards specifications: KSIEC 60439.

The low - voltage switchboards shall have a rated insulation level of 1000 VAC

and shall have a rated operational voltage up to 690 VAC. The low - voltage

switchboard shall be suitable for system earthing arrangement via earth

electrode. The low - voltage switchboard shall be capable of withstanding a

short time withstand current of 50 KA rms for 1.0 second. The low - voltage

switchboard shall accept a rated current of upto 3200 Amps.

The low - voltage switchboard shall be designed to distribute power with a

frequency of 50/60 Hz. The switchboard shall be prefabricated and shall

comply with standard IEC 439 -1 or BS 5486, concerning the construction of

type-tested assemblies (TTA).

The low - voltage electrical switchboard shall be type-tested assemblies (TTA)

and test certificates shall be available, in compliance with standard IEC 439 -

1.

The low - voltage electrical switchboard shall comply with standard IEC

68.2.30 (hot and damp climates) and with standard IEC 68.2.11 (salt mist). The

low - voltage electrical switchboard shall be suitable for system earthing

arrangement type as defined in standard IEC 984.

The low -voltage electrical switchboard shall have a permissible asymmetric

short-circuit current for 0.5 second. The busbars shall be designed for

mounting on insulated supports that are sufficient in number to accept the

electrodynamic forces resulting from the flow of the peak asymmetric short-

circuit current.

79

The low - voltage electrical switchboard shall have an earthing circuit

including a bar that can be removed for isolation purposes during the

necessary insulation measurements (removal of the bar shall require a tool).

The switchboard shall be suitable for: Front and Rear Access.

The cable entry shall be via the: Bottom / Top. The low - voltage electrical

switchboard shall be maximum 2200 mm high, in compliance with standard

DIN 41-488. Natural ventilation shall make it possible for the switchgear and

control gear components to operate within the recommended

environmental ranges.

The low - voltage electrical switchboard shall have small depths, thus

optimizing layout in electrical rooms: 600 mm up to 2500 A.

7.6.2 Construction and Operation

The enclosures, front plates and doors of low - voltage switchboards shall be

made of 2 mm thick, electrogalvanised steel sheet metal, which shall have

received an anti-corrosion coating (hot polymerized polyester/epoxy

powder). The low - voltage switchboards shall be designed for simple and

dependable installation of busbars and switchgear and control gear

components, as well as the necessary connections, using specific protective

barriers and supports for each function.

The front panels of the switchboards shall be removable to facilitate servicing.

The system of construction shall offer a complete functional set of

prefabricated elements for installation of switching, protective,

measurement, control and monitoring components.

A set of busbars shall be installed from the top to the bottom of the

switchboard to facilitate connection of switchgear and control gear

components and subsequent modifications.

Insulated current distribution arrangements shall be used to Supply a row of

modular components. Reserve space shall be pre-equipped to Supply new

modular components.

The low - voltage electrical switchboard shall be made up of identified

functional volumes including the bus bar compartment, switchgear and

control gear component compartment and auxiliaries compartment.

The different bus bars shall be the main bus bars, distribution bus bars and

auxiliary bus bars.

The bus bars shall be made of electrolytic copper, (type Cu ETP as defined by

standard ISO 1337). The compartments shall be located inside a metal

enclosure with walls providing protection against direct contact with live

parts and guaranteeing a degree of protection IP31.

The frame, the external panels (doors, side and rear panels, tops) and internal

elements (ducts) shall be made of 2 mm thick electrogalvanised steel sheet

metal and protected by an epoxy - paint coating. Sheet metal elements in

the immediate proximity of high currents shall be made of aluminium.

80

The low - voltage electrical switchboard shall be made up of identified

functional volumes including the busbar compartment, switchgear and

control gear component compartment and auxiliaries compartment.

The different busbars shall be the main busbars, distribution busbars and

auxiliary busbars.

The busbars shall be made of electrolytic copper, (type Cu ETP as defined by

standard ISO 1337).

The compartments shall be located inside a metal enclosure with walls

providing protection against direct contact with live parts and guaranteeing

a degree of protection IP31.

The frame, the external panels (doors, side and rear panels, tops) and internal

elements (ducts) shall be made of 2 mm thick electrogalvanised steel sheet

metal and protected by an epoxy - paint coating. Sheet metal elements in

the immediate proximity of high currents shall be made of aluminium.

Drawers or air circuit breakers shall have four different positions: connected,

test, disconnected and removed. Withdrawability of upstream and

downstream power circuits and of auxiliary circuits shall be total, i.e. of the

"WWW" type in compliance with standard IEC 439 - 1. The switchboard shall

be suitable for installation side by side and back to back and capable of

receiving lateral ducts for busbars, cables and terminals. The switchboard

cover panels shall be removable. The construction system should provide a

complete set of elements for installing fixed or withdrawable switching and

protective devices, measurement devices and control/monitoring devices in

the switchboard. The drawers shall be designed such that the stipulated

degree of protection is non-maintained whatever their position (connected,

test, disconnected, removed).

7.6.3 Protection and Safety

Protective front plates with cutouts for component operating handles shall be

installed systematically.

Internal protection systems shall prevent accidental direct contact with live

parts through to the upstream terminals of the outgoing components.

The low - voltage electrical switchboard shall ensure the safety of life and

property as well as provided a high level of continuity of service.

Switching safety shall be ensured by a mechanical device preventing on-

load withdrawal.

Operating safety shall be ensured by compartmenting in compliance with

standard IEC 439 - 1 and according to form type 3b.

Current interruption shall be of the "visible break isolation" or "positive" contact

indication" type as defined by standard IEC 947-3.

81

In view of reducing the risk of electrical shock: Power and control circuits shall

be separate and completely isolated. Auxiliary circuits shall be of the extra -

low voltage type.

The low - voltage electrical switchboard shall be equipped with two types of

mechanical locking compatible with the different positions of drawers. The

locking system shall be partially mobile and implement three padlocks.

Optionally, the safety of persons shall be enhanced by a version complying

with the requirements of standard AS 3439 - 1 concerning the propagation of

an arc inside electrical switchboards. Test certificates shall be available.

7.6.4 Installation

Splices shall be implemented to ensure the electrical continuity of the

horizontal busbars, auxiliary buses and the protective conductor between

adjacent sections. It shall be possible to secure the sections to a floor that is

flat to within 2mm/m. Extensions to the low - voltage electrical switchboards

shall be possible on either side (right or left).

7.7 Specifications for distribution transformer – Ground mounted three phase

transformer (2000KVA)

7.7.1 Forward

This specification has been prepared by Aberdare Engineering Ltd and it lays

down requirements for Ground Mounted 3 Phase Distribution Transformers.

The specification is to be used in procurement of the equipment.

This specifications is based on IEC 76 and is subject to revision and when

required. It supersedes all specifications for Ground Mounted Distribution

Transformers published before the revision date.

Single Phase Transformers are covered in Part 1 while Pole Mounted

Transformers are covered in Part 2 of the same series – TSP 10-001.

The specification was prepared to establish and promote uniform

requirements for oil - immersed, air - cooled distribution transformers. It

stipulates the minimum requirements for equipment acceptable for use in the

company.

It is expected that manufacturers will provide energy efficient standard

design that will provide high levels of efficiency and significant initial cost

saving.

Schedule 8.2 of the Tender Form in section 8 shall be filled in detail by the

Manufacturer and submitted together with other Bid Documents for

evaluation.

7.7.2 Scope

(a) This specification is for oil-immersed, air –cooled, outdoor type three

phase distribution transformers for 11kV distribution systems operated

at 50Hz.

82

(b) The specification covers ground mounted distribution transformers of

the following voltage ratios and ratings

(i) 11000/433V: 2000KVA

7.7.3 References

The following documents were referred to during the preparation of this

specification; in case of conflict the requirements of this specification

take precedence.

Aberdare Engineering. Ltd (Specification for Distributions Transformers)

IEC 76: Power Transformers

BS 171: Power Transformers

BS 381C: Specification for colours for identification, coding and special

purposes.

IEC 296: Specification for unused mineral insulating oil for transformers

and switchgear.

IEC 603504: Loading guide for oil – immersed power transformers.

ESI 35 – Distribution Transformers

BS 6436: Specification for Ground Mounted Distribution Transformers for

Cable Box or Unit Substation Connection.

7.7.4 Terms and definitions

For the purpose of this specification, the definitions given in IEC 76 shall

apply.

7.7.5 Requirements

7.7.5.1 Service conditions

7.7.5.2 Operating conditions

The transformers shall be suitable for continuous operations outdoors in

tropical area at altitudes of up to 2200m above sea level, humidities of

up 90% average ambient temperature of +30ºC with a minimum of 1ºC

and a maximum of +40ºc and heavy saline conditions along the coast.

7.7.5.3 System characteristics

(a) The transformer will be connected to overhead which is of unearthed

(i.e. without aerial earth wire) construction.

(b) The primary system is having a nominal voltage of 11000 volts and

systems highest voltage of 12000 volts respectively. The primary system

is 3 – phase 3 – wire 50 Hz and the secondary is 433 volts three phase 4-

wire.

83

7.7.6 Design and construction

7.7.7 General

(a) The transformer shall be three phase, oil immersed type, air cooled,

outdoor, core-type and shall be designed, manufactures and tested as

per IEC 76.

(b) The transformer shall be either free breathing type or sealed type as

specified in schedule 8.2.

(c) Free breathing transformers shall be provided with a conservator, and

a dehydrating breather (cobalt free). The conservator shall be in such

a position as not to obstruct the electrical connections to the

transformer and oil gauge provided at one end of the conservator

marked with oil levels. The conservator shall have a feed valve.

(d) The complete transformer shall be painted and protected against

corrosion and the final colour of the exterior surface shall be Dark

Admiralty Grey colour No. 632 as per BS 381C. The total thickness of

the paint coat shall not be less than 80 um at any point. Dry Painting is

also accepted. The inside of the tank shall be coated with oil resisting

varnish or paint so that oil cannot come into contact with tank or metal

at any point.

(e) Each transformer shall be suitable for ground mounting.

(f) Drawings and documentations for each size of transformer tendered

shall be given, clearly detailing important dimensions, clearances,

accessories, fittings, internal assembly, material details and any special

features of the offered design.

7.7.8 Tank

(a) The transformer tank shall be constructed of mild steel plates

fabricated by pressing or rolling. Tank thickness shall be stated in

schedule 8.2.

(b) The transformers tank shall be sealed by means of suitable gasket and

be fitted with earthing terminals. Eight (8No.) non- standard shearing

bolts to deter unauthorized opening shall be used on bolted corners

and centres of sides of top cover. All bolts, nuts and washer shall be

Hot Dip galvanized to BS 729.

7.7.9 Core

(a) The cores shall be constructed of high quality low loss grain oriented

electrical steel laminations. The design shall ensure no hot sections due

to over fluxing or circulating currents across the laminations. The flux

density at any point shall not exceed 1.65 Tesla.

(b) The cores shall be clamped effectively with metal cross-arms and fitted

with core lifting lugs. The manufactures shall demonstrate

experimentally or via previous test report, that the whole structural

frame-work supporting the transformer winding and the core definitely

withstand repeated transformers short-circuits.

84

7.7.10 Windings

(a) The windings shall be of electrolytic copper cable of sustaining short

circuit forces on the transformers as required in clause 7.7.15.

(b) The primary windings shall be of full coil copper wire as opposed to

segmented winding and the secondary winding and the secondary

windings shall be coil or foil of copper.

(c) The HV and LV windings shall be separated so as to allow for cooling

and ease of repair. Insulating sleeves for the transformer tappings shall

be in crepe paper or better.

7.7.11 Tapping

(a) The high voltage winding shall have tapings ±2x2.5% operated by an

off circuit self –positioning tapping switch with marked position

indicators. Tapping details shall be included on the transformer name

plate.

(b) Switch position No. 1 shall correspond to maximum plus tapping. The

make contacts of the tap changer shall be robust and of sufficient

surface area.

(c) Where request is for transformers without conservators, the transformer

core and all electrical parts inside the transformer shall be sufficiently

submerged in oil by no less than180mm for 11kV from the minimum oil

level mark.

7.7.12 Vector Group

(a) The three phase transformer shall be wound IEC vector reference

Dyn11.

(b) The star point of the low voltage winding shall be brought out to a

neutral bushing.

7.7.13 Cables Boxes, Bushings and Clearances

(a) The ground mounted transformers shall be fitted with cable boxes.

(b) The High Voltage and Low Voltage cable boxes shall be mounted on

opposite sides of the tank by bolting and arranged for cables entering

vertically from below bottom). Each bushing shall have a separate

insulator moulding.

(c) The HV cable box (11kV transformers) shall be suitable for terminating

three core cables up to 3000mm² XLPE cable on a camp pad. It shall

be unfilled type suitable for heat/cold terminations.

(d) The LV cable box shall be suitable for terminating up to 7No. Single

core PVC cables of 600mm² on a clamp pad.

7.7.14 Oil and Cooling

(a) Cooling of the transformer shall be by natural circulation of oil and

natural circulation of air (ONAN). Loading will be as per IEC 60354.

(b) Each transformer shall be dispatched filled with oil to the correct level

and ready for service. The oil shall be new (unused), uninhibited

mineral insulating oil class I as per IEC 296.

85

7.7.15 Fittings and Accessories

(a) 4No drain valve shall be fitted unless specifically requested in schedule

8.2

(b) Oil gauge shall be provided on all transformers and shall be of dial or

floater type. The oil gauge shall be clearly readable by an operator

standing at a distance of 5 meters away from the transformer. The

maximum and minimum oil level marks shall fall within 50% of the full

range of the gauge with the nominal oil level being at the centre of

the range.

(c) Every transformer shall be complete with an oil temperature

thermometer fitted on the top cover in a visible and secure position.

(d) Every transformer shall be complete with a pressure relief device fitted

on the top cover in a visible and secure position. No part of the

pressure relief device shall extend to a height greater than the HV

bushings.

(e) For bolted transformer covers, provision shall be made in form of a

removable jumper, to provide for good electrical connection between

the top cover and the transformer tank. The jumper shall be

sufficiently rated to carry the faulty currents without damage.

7.7.16 Rating

(a) The transformer shall be capable of carrying its full normal rated

current continuously under the tropical conditions stated (maximum

ambient temperature of 40ºC) and at any tapings without the

temperatures rise in the hottest region exceeding 55ºC and 60ºC in oil

and winding respectively. Documents to support this shall accompany

the tender.

(b) The transformer shall be capable of sustaining a three-phase

symmetrical short circuit on the low voltage side with the power

maintained on the high voltage side without damage or distress for 2

seconds. AEL design distribution fault level for 11kV is 25 kA.

(c) The transformers shall be in the following sizes:

(i) 11000/433V:2000KVA

(d) The rated withstanding voltages (external & internal) for the

transformers shall be as follows:

Highest

system

voltage

(r.m.s)

Rated short duration

power frequently

withstand voltage

(r.m.s)

Rated lighting

impulse

withstand

voltage (peak)

11/0.433kV

Transformers

12kV 38kV 95kV

7.7.17 Impedance Voltage

(a) The impedance voltage measured at the principal tap shall not

exceed the values indicated in the following table

86

Rating KVA Impedance Voltage %

11/0.433kV

Transformers

2000 5.0

7.7.18 Losses and Capitalization

(a) The guaranteed maximum sum total of the transformer losses,

measured at full load operation, unity power factor and rated voltage

shall not exceed values indicated in the table below. The loss

measurements shall be adjusted to 75 degree Celsius and submitted

for evaluation.

Rating KVA TOTAL TRASFORMER LOSSES

e.g. (Fe + Cu) Watts

11/0.433kV

Transformers

2000 8 190

In addition, values of measured no load and load losses at 125%, 100%,

75%, 50% and 25% transformer loading shall be provided . However,

for the purpose of comparison of tenders, measured no load losses and

load losses at 100% loading shall be used.

(b) Evaluation will be carried out to establish capitalized values of no-load

losses and load losses at nominal rating of transformer. This cost will be

added to the bid price (landed cost) of the tender.

Transformer losses shall be capitalized at the following rates:

Full load (winding) Losses US$ 1902 per kW for 15 years

No load (core) Losses US$ 4504 per kW for 15 years

Where tenders are being compared, losses will be capitalized at the

above rate and added to the bid price according to the formula

below:

Gep = Gbp + G($), Gep = Bid evaluation price, Gbp = Bid price

G($) = Adjustment for the cost of the operation and maintenance for

15 years and is obtained by using the following formula.

G($) = 1902 X full load winding losses (kW) + 4504 X no load losses (kW)

7.7.19 Marking and Rating Plate

(a) Each transformer shall be provided with a rating plate of weather

proof material, fitted in a visible position, showing the appropriate

details listed in IEC 76. The entries on the plate shall be indelibly

marked (either by etching, engraving or stamping).

(b) In addition, the name plate shall include load losses for the highest,

lowest and principle tap positions, temperatures class insulation,

connection diagram and the inscription PROPERTY OF KENYA

COMERCIAL BANK LTD all marked indelibly as in (a).

87

7.8 Test and factory inspection

(a) The transformer shall be inspected and tested in accordance with the

requirement of IEC 76 and this specification. It shall be the responsibility

of manufacturer to perform or to have performed all the tests

specified. Tenders shall confirm the manufacturer’s capabilities in this

regard when submitting tenders. Any limitations and availability

National Testing Centres shall be clearly specified.

(b) Copies of previous Type Test Report for similar rated equipment shall be

submitted with the tender for the purpose of technical evaluation.

These certificates shall be certified by the National Testing or the

National Standards Authority of country of manufacture.

(c) Prior to the manufacture of transformers on order, the purchaser (KCB)

reserves the right to inspect the manufacturing facility and the quality

management system at no extra cost save for air travel to (of two

Engineers) to the nearest international airport in the country of

manufacture.

(d) Upon completion of the manufacturing process, the transformers shall

be subject to inspection by two Engineers come from KCB and one

from the consultants at place of manufacture and routine tests carried

out on samples picked at random in their presence. In addition to

these tests, impulse and Heat Run tests to IEC 76 shall be carried out on

randomly picked sample of the transformers. The Engineers shall

approve shipment of the equipment if they are satisfied that the

requirements of the specification are fully met.

(e) Routine Test Reports shall have been completed for each transformer

and made available before the inspection by two Engineers (from KCB

and AEL)

7.9 Technical documentation

(a) The Bidder shall enter the actual characteristics of size of transformer

offered in schedule 8.2 and submit it together with copies of

manufacturer’s catalogues, brochures, technical data, drawing, bill of

materials and test certificates clearly marked to support each clause,

all in English for evaluation. The manufacturer’s type

reference/designation and size of the item offered shall be indicated.

The drawing shall include all the internal and external details as well as

the accessories and fitting specified and are to be supplied.

(b) In filling schedule 8.2, where it is stated specify, tenderers shall refer to

the relevant clauses in this specification. Actual dimensions and values

are to be used in filling the schedule 8.2

(c) Manufacturers shall indicate any additional measures taken to mitigate

electrical and mechanical stress resulting from system surges.

(d) The manufacturer’s certified Declaration of Conformity to Reference

Standards and detailed list of previous customers (utilities) outside the

country of manufacture shall also be submitted with the tender.

88

(e) The manufacturer shall indicate the monthly & annual production

capacity and experience in the production of the type and size of

transformer he is offering. List of workshop tools and equipment shall

also be appended.

(f) In case of tender award, technical and drawing for the transformers to

be supplied shall be submitted to the purchaser (KCB) for approval by

the consultant before manufacture commences. The drawings shall

include all the internal, external and material details as well as the

accessories and fittings to be supplied.

NB: The transformers must be sourced form a European Manufacturer

preferably France, Belgium or United Kingdom.

8 TECHNICAL SCHEDULE - BIDDERS TO COMPLETE

The bidder shall after reading through the Technical Specifications and the

Tender Documents in general complete the technical schedules below,

which also constitute the guaranteed technical particulars. The completed

schedules shall accompany the bid. Attach manufacturer's profile,

catalogues and manuals to verify details entered in the schedule

8.1 Tender form for Switchboard and associated switchgear

A SWITCHBOARD

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONS

E [Enter value or

Yes or No as

appropriate]

COMMENT

1 Manufacturer's name Indicate

2 Manufacturer's letter of

Authorization.

Provide copy

3 Copy of ISO 9001/2

certificate.

Provide copy

4 Type or designation number

of Switchgear offered and

applicable standard.

5 Manufacturer's experience

in manufacturing same

type of Switchgear panels.

At least

15 years


in manufacturing similar

type of Switchgear

At least 15

years

7 No. of units sold in the last 5

years.

≥400

8 No. of units sold in the

export

market [attach list] in the

last 5 years [attach export

≥200

89

list]

9 enclosure [IP] class of

protection [attach type test

certificate]for the offered

panel type

IP43

10 Arc proof design [attach

type test certificate] for the

offered panel type

Yes

11 Rated voltage 17.5kV

12 Rated power frequency

withstand [attach routine

test report] for the offered

panel type

38kV

13 Rated lighting impulse

withstand [attach type test

report] for the offered

panel

type

95kVp

14 Metal clad compartments:

[CB, Busbar, LV, CT/VT &

Cables& Energy meter]

attach layout drawing for

the offered panel type

5

15 Busbar material Copper

16 Dimensions [WxHxD [attach

layout drawing, including

Energy meter

compartment]

provide

17 Short circuit withstand 31.5kA, 3 sec

18 Arc Proof design for entire

switchgear board

Yes

19 ARC venting Yes

20 Lockable door with viewing

glass in CB compartments

Yes

21 Lockable door for LV

compartment

22 Earth switch rating on

making and withstand

31.5kA, 3 sec

23 Earth switch position visible

from the front

Provide

24 Shutters for Busbars [red]

and Circuit [yellow]

provided.

Provide

25 Provision to safely open the

shutters for phasing out

provided

Provide

90

26 Anti-condensation heater Provide

27 Hygrostat with variable

Humidity and temperature

control setting

Provide

28 Busbar and Circuit

continuous current rating

630A

29 Integral or separate earth

switch

Provide

30 Horizontal or vertical

Isolation and withdrawal of

circuit breaker

Provide

31 Live cable indicators for

incoming & outgoing

cables

Provide

32 Interlock between

Incoming

live cable and Earth switch

Provide

33 Separate locking of Busbar

and circuit shutters

Provide

34 Earth switch operating

handle cannot be inserted

into operate position when

CB is in circuit position

Yes

35 Switchgear panel width Yes

36 Switchgear panel depth ≥2500 mm

37 Length(Height) of LV

Compartment

≥550mm

38 Total Height of the panel,

including Energy meter

compartment

≥2800mm

39 Detailed catalogue and

manual for the switchgear

panels with detailed design

drawings

Provide

40 Dimensioned Layout

drawing for the complete

switchgear panel

Provide

41 Single Line drawing for

Protection, Control and

Metering

Provide

42 Routing test report for similar

panel as per IEC 298

Provide

B 11 KV CIRCUIT BREAKER (CB)

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

91

or No as

appropriate]

1 Manufacturer's name Indicate


Authorization

Provide


certificate

4 Type of Designation

number of circuit breaker

offered

5 Applicable standard for

manufacture and testing

State



type of circuit breaker

≥15



type of circuit breaker [MV

indoor circuit breaker]

≥15

8 Units sold in the last 5 years ≥1000

9 Units sold to export market

in the last 5 years

≥500

10 Type of interrupter

employed

Vacuum

11 Name of manufacturer of

vacuum interrupter

Provide

12 Manufactures experience

in manufacturing vacuum

interrupters

≥15 years

13 Rated circuit breaker

voltage

17.5kV

14 1 minute power frequency

withstand [attach test

report]

38kV

15 Impulse withstand voltage

[attach type test report]

95kV

16 Rated short circuit current

and withstand [attach type

test report]

31.5kA, 3 sec

17 Rated short time making

current peak [attach type

test report]

79kA

18 Circuit breaker operating

sequence [attach type test

report

0-0.3 sec-co-3

min-co

19 Motor wound spring Yes

92

operated mechanism

20 Auxiliary DC voltage for

closing and tripping coils.

Indicate coil operating

tolerance

30 V DC

Trip-free mechanism

Anti-pumping feature

Yes

Provide

21 Auxiliary AC supply 240 VAC

22 CB operating mechanism Motor wound

spring

23 visible spring

charged/discharged

mechanical indication on

CB as per specifications.

Provide

24 Visible CB ON/OFF

indications as per

specifications

Provide

25 Connection of CB to

auxiliary panel circuits via a

plug-in cable

Provide

26 Operations counter Provide Provide

CB close and open

mechanical push buttons

on CB

Provide

27 CB isolation Vertical/Horizo

ntal

28 CB withdrawal Horizontal

29 CB lowering trolley

provided [for horizontal

withdrawal] suitable for use

by one

switching operator

Provide

30 CB withdrawal not possible

when CB is closed.

Yes

31 CB cannot be drawn-in until

the earth switch is open

and auxiliary circuits

connected [powered]

Yes

32 Earth switch cannot be

closed when CB is in circuit

position or in transit

Yes

33 CB cannot close when in

transit

Yes

34 Circuit breaker is equipped

with anti-pumping device

Yes

35 CB routine test report as per Provide

93

1EC 62271-100

36 Circuit Breaker rated load

current

200A

37 Circuit breaker poles

between the interrupters

and the primary plug in

contacts-insulated. State

method on insulation

Yes

C CURRENT TRANSFORMERS (CT)

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

or No as

appropriate]

1. Manufacturer's name Indicate


Authorization

Provide

3 Copy of lSO 9001/2

certificate

Provide


of CT

Applicable standard State



type of CTs

≥7 years



type of CTs [MV, Indoor

type]

≥15years

7 No of units sold in the last 5

years

≥600

8 No of units sold in the export

market in the last 5 years

≥300

9 Rated voltage of offered CT 17.5kV


withstand voltage [attach

test report]

38kV

11 Impulse voltage withstand

[attach copy of type test

report]

95kVp

12 Short-circuit withstand

current and duration


report]

31.5kA, 3 sec

94

13 CT details Ratio - 3 00/200/

100/1 A Corel - 15VA, 5P15

Core2 - 15VA, cl0.2

Core 3 - 15VA, cl0.5

Yes

Yes

Yes

Yes

14 Routine test certificates of

similar CTs as those listed in

clause 13 above. NB: the

classes must be the same

as per IEC 60044-1.

Provide

Provide manufacturer's CT

catalogue

D VOLTAGE TRANSFORMERS

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

or No as

appropriate]

1 Manufacturers name

2 Manufactures letter of

authorization

Provide

3 Copy of ISOS 9001/2

certificate

Provide


of VT


5 Manufacturers experience

in

manufacturing same type

of VTs

≥15 years

6 Manufacturers experience

in

manufacturing MV, indoor

VTs

≥15years

7 No. of units sold in the last 5

years

≥500

8 No. of units sold in the

export market in the last 5

years

≥200

9 Rated voltage of offered VT 17.5kV


withstand voltage [attach

routine test report]

38kV

11 Impulse voltage withstand


report]

95kV

12 VT details Ratio:11KV√3;110√ Provide

95

VAC Core 1: 100VA,cl0.2

Core2:50VA, cl 0.5

Provide

Provide

13 Primary fuses Provide

14 Secondary MCBs Provide

15 Copies of routine test

reports for VT of similar

voltage rating as per IEC

60044-2

Provide

16 Manufacturer's VT

catalogue

Provide

E PROTECTION RELAYS AND AUXILIARY RELAYS

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

or No as

appropriate]

1. Manufacturer's Name State

2. Manufacturer's letter of

Authorization

Provide



certificate of manufacturers

Provide


in manufacturing

protection and auxiliary

relay

≥ 30 yrs.

5 Total no. of measuring

relays sold in the last 5 years

≥5000

6 Experience in manufacture

of numerical protection

relays

≥10 yrs.

7 Number of numerical

protection relays sold in the

last 5 years

≥5000

8 Number of Numerical relays

sold to the Export Market in

the last 5 years. NB: Attach

manufacturer's export sales

list

≥2000

F PROTECTION AND CONTROL RELAYS

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

or No as

appropriate]

96

1. Relay shall be of Numeric

Design

State

2 Relay designed for Bay

Protection & Control

State

3 Size of Relay LCD screen State

4 For flush mounting on panel

surface

State

5 Relay is equipped with

Circuit Breaker close and

open key/ push buttons

State

Relay has the following

protection functions

State

6 Three phase overcurrent Provide

7 Earth fault function Provide

8 Sensitive earth fault

function

Provide

9 Over & Under frequency

function

10 Over and under-voltage

function

11 Thermal Overload

function

12 Broken Conductor

function

Provide

13 Circuit breaker

maintenance function

Provide

14 Measurement and display

of instantaneous values of I,

V, P, 0 and p.f. on the LCD

State

15 Trip Indication Via Red LED

16 Healthy Indication via

Green LED

17 Relay has eight LEDs for

Annunciation

18 Start and Trip output

contacts are freely

configurable

19 Relay terminals are screw

type and adequate to

97

accommodate 4mm2

cable

20 Fault Records storage

capacity

State

21 Events storage capacity State

22 Disturbance Record

storage capacity

State

23 MMI with keypad and LCD Provide

24 Serial RSS232 port Provide

25 Communication Port for

connection to Local

network

26 Software to be provided:

Seven Copies of software in

CD ROM required

State name of

software

27 Relay is equipped with IEC

61850 communication

State

28 Seven (7) connection

cables from relay to laptop

provide

29 Seven(7)Detailed

publication/operation and

instruction manual

attached to verify all the

specifications

Provide

30 Rated DC supply and

tolerance

State

G THREE PHASE OVERCURRENT AND EARTH FAULT RELAY

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

or No as

appropriate]

1 One time delayed element

and two high set elements

State

2 Setting range and step for

IDMT element for both

current and Time Multiplier

Setting

State

3 Selectable Current/Time

curves for IDMT element

State


high set elements for both

current and time delay

State

5 Broken conductor Provide

98

protection


high set elements for both

current and time delay

State

H SENSITIVE EARTH FAULT FUNCTION

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

or No as

appropriate]

1 Current setting range State

2 Time delay State

I TRIP RELAY

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

or No as

appropriate]

1 Manufacturers name State

2 Type or designation name State

3 Electrical reset Provide

4 High burden relay State

5 Operating time State

6 Contacts configuration State


tolerance

State

J TRIP CIRCUIT SUPERVISORY RELAY

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

or No as

appropriate]



3 Supervision for CB open

and

closed status

State

4 Contacts configuration State


tolerance

State

99

K CIRCUIT BREAKER CLOSE /OPEN SWITCH

DESCRIPTION KCB

REQUIREMENTS

SUPPLIER

DETAILS/RESPONSE

[Enter value or Yes

or No as

appropriate]



3 Mechanical interlock Provide

4 Close and open position

marked on the switch

State

L ANTI CONDESATION HEATER



3 Rating V, W State

M INDICATING LAMPS AND HOLDERS



3 Rating <2.5W

4 Duty Continuous

5 Duration of service >years

N POWER MEASUREMENT UNIT


2 Type or designation name

of the unit

State

3 Unit suitable for flush

mounting

4 Complete order number

of

offered unit

State

5 Parameters measured State

6 Class of accuracy of

measurement

State

7 Configuration of the unit

(3 phase + 4 wire

State

8.2 Tender form for 11000/433V Transformer (Particulars of equipment)

1 2 3 4

Item Description Schedule 1 (KCB

REQUIREMENT)

Schedule 2

(TENDERER’S OFFER)

100

1. Quantity

2. Transformer Rating kVA 2000

3. System Frequency Hz 50

4. Transformer external paint Dark Admiralty

Grey colour No.

632 as per BS

381C

5. Corrosive environment high

6. Dimensions

a) Overall height

b) Overall length

c) Overall width

d) Total mass

mm

mm

mm

kg

Required

Required

Required

Required

7. Tank type Breathing

8. Tank sealing; Bolted

9. Under–base; Flat

10. Skids and jacking lugs for

concrete plinth mounting

40mm diameter

axle holes

11. Details of Jacking pads Required

12. Lifting lags

a) for cover

b) for tank

c) for core

Required

Required

Required

13. Terminations Cable box (both

HV& LV)

14. Position of bushings Side (both

HV&LV)

15. Medium–Voltage bushings

a) Material/colour

b) Creepage distance

c) Phase to earth

clearance

d) Phase to phase

clearance

Low – voltage bushings

a) Material/colour

b) Creepage distance

c) Phase to earth

clearance

d) Phase to phase

clearance

e) Terminal: stem & nuts

or clamp

mm

mm

Porcelain

Specify

Specify

Specify

Porcelain

Not less than

60mm

Specify

Specify

Clamp pad

16. Cooling method ONAN

17.

Core type Laminated

stacking

101

18. Core clamping Steel

19. HV Winding Full coils of

electrolytic

copper

20. LV Winding Electrolytic

copper coils or

copper foils

21. Primary voltage

Secondary voltage

Number of phases:

V 11000

Three phase

22. Rating of low-voltage

neutral terminal

As phase

terminal

23. Tap Changer NLTC,±2x2.5%

Tapping range

T

24. Vector symbols Dyn 11

25. Losses corrected to 75ºC

as Clause 7.7.18:

a) No load losses

b) Full load cu losses

c) Full load total losses

d) 25% loading

e) 50% loading

f) 75% loading

g) 125% loading

Transformer efficiently at

unity power factor,

rated voltage and full

load 75ºC

W

W

%

Specify

Specify

Specify

Specify

Specify

Specify

Specify

Specify

26. Impedance voltage as

clause 7.7.17

a) Maximum tap

b) Nominal tap

c) Minimum tap

%

Specify

Specify

Specify

27. Internal Insulation level

(PF/LI)

a) Medium voltage

b) Low-voltage

kV

kV

38/95

5/NA

28. Number of copies of

routine test results to be

provided for each

transformer

2 copies

29. Stamped Type Test

Certificate with serial

numbers and previous

Type Test Reports for:

(i) Temperatures Rise

Type Test Report

and the Type

Test Certificate

required (Where

very low

102

(ii) Dielectric Tests

(iii) Short – circuit

withstand

(iv) Sound level

determination

(v) Corrugated tank

test for panels of

depth exceeding

260mm

transformers are

offered, the test

reports

submitted shall

reflect this.)

30. BIL Tests To be done at

95kV during

factory visit

(clause 7.8)

31. Transformer Heat Run

&Temperature Rise Tests

To be done

during the

factory visit

(clause 7.8)

32. Transformer leakage test Required

33. Stamp and signature of

Manufacturer and Date

Signature_______________________________________

Date___________________________________________

NOTE:

The Bidders should note that the above Technical schedules must be fully

completed and submitted with the bid. Failure to complete the schedules

shall lead to rejection of the bid. Each entry in the schedule in compliance

with the specifications shall constitute one (1) mark. The maximum possible

score shall be 100 and the lowest possible score shall be 0.

8.3 Factory inspection

Where the winning bidder's manufacturer has not delivered metering 11kV

switchgear panels to KCB before, then KCB and AEL engineers will conduct

factory inspection, before contract signing. A manufacturer who fails to meet

the set standards will be disqualified and the second lowest bidder awarded

the tender.

8.4 Criteria for passing technical evaluation

Any Bidder who fails to score 75% in the technical schedule shall not be

considered further in the evaluation. In addition to a score of 75% or higher

the winning bidder must fully meet the requirements of the specifications

before tender Award.

Deviation: Any deviation from these specifications if any shall be clearly

stated. The bidder shall demonstrate that the technical specifications are still

fully meet in spite of such minor deviations.

Deviations from the Bill of materials or from the ratings of various equipment’s

listed in this Specifications are NOT acceptable.

103

Before Contract signing, any minor deviations shall be discussed and

resolved.

Note: The schedules do not in any way substitute for detailed information

required elsewhere in the tender document.

NB: The bidder should read through the document thoroughly and submit

with the bid all the required test certificates, manuals and drawings, etc.

9 GENERAL CONDITIONS OF CONTRACT

Specific terms of contract shall be discussed with the bidder whose proposal

will be accepted by The Bank. The resulting contract shall include but not

limited to the general terms of contract as stated below

9.1 Award of Contract

Following the opening and evaluation of proposals, The Bank will award the

Contract to the successful bidder or multiple bidders whose bids have been

determined to be substantially responsive. The Bank will communicate to the

selected bidders its intention to finalize the draft conditions of engagement

submitted earlier with their proposals. The successful Bidder(s) shall be invited

for agreement and signing of the Contract prepared by The Bank in

consultation with the Bidder.

9.2 Application of General Conditions of Contract

These General Conditions shall apply to the extent that they are not

superseded by provisions in other parts of the Contract that shall be signed.

9.2.1 Bid Validity Period

Bidders are requested to hold their proposals valid for ninety (90) days from

the closing date of their submissions.

9.2.2 Non-variation of Costs

The prices quoted for the service and subsequently agreed and incorporated

into the contract shall be held fixed for the contract period.

9.2.3 Performance Security

The Bank will require that the prospective Contractor (s) who is/are eventually

awarded the tender shall execute a performance bond with a reputable

bank in favor of Kenya Commercial Bank Limited. The performance bond

amount will be ten percent (10%) of the total bid price before the bank can

issue any LPO. The performance bond will be valid for a minimum of 12

months and must be provided within 15 days from the date of written

notification to the Contractor by The Bank to provide the bond. Failure to

comply with this requirement will void the tender award and The Bank at its

sole discretion may award the tender to any other Contractor.

104

(a) The Bank may at its discretion require the successful bidder to furnish it

with Performance Security in the amount specified in the accepted Bid.

(b) The Performance Security shall be in the form of a Bank guarantee issued

by a commercial bank operating in Kenya and shall be in a format

prescribed by the Bank (see Appendix D). The performance guarantee

shall be submitted within 15 days of notification of award.

(c) The proceeds of the Performance Security shall be payable to the Kenya

Commercial Bank Limited as compensation for any loss resulting from the

Bidder’s failure to complete its obligations under the Contract.

(d) The Performance Security will be discharged by the Bank not later than

two months following the date of completion of the Bidder’s

performance obligations, and the Bank’s acceptance of the final project

as specified in the contract.

9.2.4 Delays in the Bidder’s Performance

(a) Delivery and performance of the works shall be made by the successful

Bidder in accordance with the agreed time schedule.

(b) If at any time during the performance of the Contract, the Bidder should

encounter conditions impeding timely delivery and performance of the

works, the Bidder shall promptly notify The Bank in writing of the fact of the

delay, its likely duration and its cause(s). As soon as practicable after

receipt of the Bidder's notice, The Bank shall evaluate the situation and

may at its discretion extend the Bidder's time for performance, with or

without liquidated damages, in which case the extension shall be ratified

by the parties by amendment of the Contract.

(c) Except in the case of “Force Majeure” as provided in Section 9.2.11, a

delay by the Bidder in the performance of its delivery obligations shall

render the Bidder liable to the imposition of liquidated damages pursuant

to Section 9.2.5.

9.2.5 Liquidated damages for delay

The contract resulting out of this tender shall incorporate suitable

provisions for the payment of liquidated damages by the bidders in case

of delays in performance of contract.

The works must be delivered within the agreed timelines after The Bank

issues an LPO. Any delayed delivery will attract a penalty of 2 percent of

the cost of the LPO value for every week of late delivery up to a

maximum of 4 weeks after which The Bank will cancel the LPO black list

the Contractor for at least three years and exercise its rights under the

performance bond.

Notwithstanding the provisions detailed in this section, The Bank reserves

the right to terminate the award at any time and take corrective

measures as necessary to protect The Bank’s interests, which interest are

solely determined by The Bank.

105

9.2.6 Governing Language

The Contract shall be written in the English Language. All

correspondence and other documents pertaining to the Contract which

are exchanged by the parties shall also be in English.

9.2.7 Applicable Law

This agreement arising out of this tender shall be governed by and

construed in accordance with the laws of Kenya and the parties submit

to the exclusive jurisdiction of the Kenyan Courts.

9.2.8 Bidder’s Obligations

The Bidder is obliged to work closely with The Bank's staff or it’s

representatives, act within its own authority, and abide by directives

issued by The Bank that are consistent with the terms of the Contract.

The Bidder will abide by the job safety measures and will indemnify The

Bank from all demands or responsibilities arising from accidents or loss of

life, the cause of which is the Bidder's negligence. The Bidder will pay all

indemnities arising from such incidents and will not hold The Bank

responsible or obligated.

The Bidder is responsible for managing the activities of its personnel, or

subcontracted personnel, and will hold itself responsible for any

misdemeanors. The Bidder will not disclose The Bank's information it has

access to, during the course of the work, to any other third party without

the prior written authorization of The Bank. This clause shall survive the

expiry or earlier termination of the contract

9.2.9 The Bank’s Obligations

In addition to providing the Bidder with such information as may be

required by the bidder to complete the works, The Bank shall,

Provide the Bidder with specific and detailed relevant information

concerning the works

In general, provide all information and access to The Bank's

personnel

9.2.10 Confidentiality

The parties undertake on behalf of themselves and their employees,

agents and permitted subcontractors that they will keep confidential

and will not use for their own purposes (other than fulfilling their

obligations under the contemplated contract) nor without the prior

written consent of the other, disclose to any third party any information

of a confidential nature relating to the other (including, without

limitation, any trade secrets, confidential or proprietary technical

information, trading and financial details and any other information of

commercial value) which may become known to them under or in

connection with the contemplated contract. The terms of this Clause

shall survive the expiry or earlier termination of the contract.

106

9.2.11 Force Majeure

(a) Neither Bidder nor The Bank shall be liable for failure to meet

contractual obligations due to Force Majeure.

(b) Force Majeure impediment is taken to mean unforeseen events, which

occur after signing the contract with the successful bidder, including

but not limited to strikes, blockade, war, mobilization, revolution or riots,

natural disaster, acts of God, refusal of license by Authorities or other

stipulations or restrictions by authorities, in so far as such an event

prevents or delays the contractual party from fulfilling its obligations,

without it being able to prevent or remove the impediment at

reasonable cost.

(c) The party involved in a case of Force Majeure shall immediately take

reasonable steps to limit consequence of such an event.

(d) The party who wishes to plead Force Majeure is under obligation to

inform in writing the other party without delay of the event, of the time

it began and its probable duration. The moment of cessation of the

event shall also be reported in writing.

(e) The party who has pleaded a Force Majeure event is under obligation,

when requested, to prove its effect on the fulfilling of the

contemplated contract.

9.2.12 Payments

The Bank’s standard payment terms are within 45 days of invoice.

Please note that no advance Payment for work to be done shall be

made.

9.2.13 Way forward

Once the bids are opened, bid analysis will commence. Short listed

Contractors will be invited to demonstrate their ability if need be and to

make arrangements for site visits. In the event that The Bank may need

to visit client site, Contractors will be notified in writing. The Bank may

also make surprise unannounced visits to the Contractors offices to verify

any information contained in the bid document. All visits are at the

discretion of The Bank.

9.2.14 Bid Effectiveness

It is a condition of The Bank that the Contractor guarantees the

sufficiency, and effectiveness of the service proposed to meet The

Bank’s requirements as outlined in this document. The Bank will hold the

Contractor solely responsible for the accuracy and completeness of

information supplied in response to this tender.

9.2.15 Contract provision

The Bank will not make any payments in advance. The Bank will issue an

LPO for all the works ordered. The LPO will be paid within 45 days after

107

certificate is issued. The Bank will not accept partial deliveries and

neither will The Bank make partial payments. Payment will be made as

per agreed terms.

9.2.16 Buyer’s Rights

The Bank reserves the right to reject any or all the tender bids without

giving any reasons and the Bank has no obligation to accept any offer

made. The Bank also reserves the right to keep its selection and selection

criteria confidential. Bids not strictly adhering to tender document

conditions may not be considered by The Bank whose decision on the

matter shall be final. The Contractor’s terms and conditions will not form

part of any contract with The Bank in relation to this tender. Bids not

strictly adhering to tender conditions may not be considered by The

Bank whose decision on the matter shall be final.

Canvassing is prohibited and will lead to automatic disqualification.

9.2.17 Responsibility as an independent Contractor

The Contractor agrees to take overall responsibility for any services

rendered; regardless of whether third parties engaged by the

Contractor or the Contractor himself carry them out

108

10 APPENDIX

APPENDIX A – FORM OF TENDER

We,

M/S_____________________________________________________________________

Hereby submit our tender “TENDER FOR ELECTRICAL POWER UPGRADE AT

KENYA COMMERCIAL BANK’S KENCOM HOUSE BUILDING NAIROBI”, at a total

cost of

KES_______________________________________________________________________

or (in words)

KES_______________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

The above quoted fee is the lump sum (fixed price) amount for the entire

assignment. The fees include all duties, levies, taxes, travelling expenses, out

of pocket expenses and any other expenses of whatsoever nature. We also

agree to abide by the terms and conditions of the contract as stipulated in

the tender document.

Bidder’s name

__________________________________________________________

P.O. BOX ____________________________________________________________

Signature of the bidder ____________________________________________________

Signature of the witness ___________________________________________________

Company Stamp/Seal.

109

APPENDIX B – CERTIFICATE OF COMPLIANCE

All Contractors should sign the certificate of compliance as attached and

return with their quotations/bids.

We _______________________________________________________________________

Have read this TENDER FOR ELECTRICAL POWER UPGRADE AT KENYA

COMMERCIAL BANK’S KENCOM HOUSE BUILDING NAIROBI and agree with the

terms and conditions stipulated therein.

Stamp and signature of the bidder

Name………………………………………….

Date…………………………………………..

110

APPENDIX C – LETTER TO KCB ON THE CONTRACTOR’S LETTERHEAD

Head of Procurement,

Procurement Department

KCB Bank Limited

Kencom House

P.O Box 48400-00100

Nairobi, Kenya

Dear Sir,

REF: TENDER FOR ELECTRICAL POWER UPGRADE AT KENYA COMMERCIAL

BANK’S KENCOM HOUSE BUILDING NAIROBI

With reference to the above TENDER, having examined and understood the

instructions, terms and conditions forming part of your above inquiry, we

hereby enclose our offer TENDER FOR ELECTRICAL POWER UPGRADE AT KENYA

COMMERCIAL BANK’S KENCOM HOUSE BUILDING NAIROBI as detailed in your

above referred inquiry.

We confirm that the offer is in conformity with the terms and conditions as

mentioned in your above referred TENDER and enclosures. We also confirm

that the prices offered shall remain fixed for a period of 90 days from the last

date of submission of the offer.

We also understand that KCB is not bound to accept the offer either in part

or in full. If KCB rejects the offer in full or in part, The Bank may do so without

assigning any reasons therefore.

Yours faithfully,

Authorized Signatories (Name & Designation, seal of the firm)

………………………………………………………………………

………………………………………………………………………

………………………………………………………………………

Date: ………………………………………………………………

111

APPENDIX D – PERFORMANCE SECURITY FORM

To: _____________________

WHEREAS................................................................... (Name of firm) hereinafter

called "The Contractor") has undertaken, in pursuance of Contract

No................. dated .......... 2015 to

supply/do...................................................................... (Description of Services)

(hereinafter called "the Contract")

AND WHEREAS it has been stipulated by you in the said Contract that The

Contractor shall furnish you with a Bank Guarantee by a scheduled

commercial Bank for the sum specified therein, as security for compliance

with the Contractor’s performance obligations in accordance with the

Contract.

AND WHEREAS we have agreed to give the Contractor a Guarantee:

THEREFORE, WE hereby affirm that we are Guarantors and responsible to you,

on behalf of the Contractor, up to a total

of......................................................................... (Amount of the Guarantee in

Words and Figures) and we undertake to pay you, upon your first written

demand declaring the Contractor to be in default under the Contract and

without cavil or argument, any sum or sums within the limit of

................................ (Amount of Guarantee) as aforesaid, without your

needing to prove or to show grounds or reasons for your demand or the sum

specified therein.

This guarantee is valid until the ........day of...................

Signature and Seal of Guarantors (Contractor’s Bank)

....................................................................

Date...........................................................

Address:

....................................................................

....................................................................

....................................................................

....................................................................

112

APPENDIX E – BIDDER’S DETAILS

Sr.

No

.

Description Contractor’s details

1. Name of the firm

2. Date of Registration of your

company (Attach a copy

of certificate of

incorporation)

3. Full physical address of

principal place of business

4. Full postal address of the

principal place of

business(include the postal

code)

5. Registered address if

different from the above

6. Map: Provide a description

of significant features /

roads next to the business

premises.

7. Office telephone number(s)

Landline:

Mobile:

8. Fax number:

9. E-mail address:

10. Website address (if any):

11. Company Tax PIN: (Kindly

Provide a copy of the PIN

Certificate)

12. VAT Registration number:

(Kindly provide a copy of

the VAT Certificate)

13. Tax Compliance certificate

(Kindly provide a current

copy of Tax Compliance

certificate)

14. Compliance with statutory

payments i.e. NSSF and NHIF

(please attach evidence of

payments for the company

staff)

15. Proof of registration with the

relevant government

body/Ministry (Must indicate

registration by the relevant

113

statutory body/Ministry

clearly indicating which

category) Attach copy of

current registration

certificate.

16. Period in which you have

been in the similar business

as tendered.

17. Names of the Shareholders,

All directors and Partners

(Please indicate the

citizenship of the directors)

Kindly provide original copy

of an official search report

issued by the Registrar of

Companies showing the

directors and shareholders

of the company

(Companies For CR 12). The

report should not be more

than one month old.

18. Associated

companies(if any)

Appointed dealers (if

any)

19. Provide the name of the

company’s certified

Secretary/Auditors

20. Please provide a copy of

the most recent annual

returns together with a filing

receipt.

21. Name of (ultimate)

parent/holding company (if

this applies)

22. Companies Registry number

of parent/holding company

(if this applies)

23. If a consortium is expressing

interest, please give the full

name of the other

organization(the proposed

consortium partners should

also complete this form in its

entirety)

24. Contact person within the Name:

114

organization to whom

enquiries about this tender

should be directed

Title:

Telephone

Office:

Mobile:

Fax:

Email:

25. A copy of your most recent

audited accounts (for the

last two years)

26. A statement of your cash

flow forecast for the current

year and a bank letter

outlining the current cash

and credit position

27. Detail any relevant

certifications and

accreditations by principals

or accreditation bodies and

attach copies of such

certification e.g. Quality

Management Systems such

as ISO, Environmental

Management etc.

28. Name of proposed Project

Manager

29. Professional & academic

qualifications of Project

Manager (attach CV)

30. Professional/regulatory

membership of proposed

Project Manager (attach

certificate copies)

31. Number of similar projects

done (minimum 3no.) within

the last 5 years with a

contract value equal to or

greater than KES 50 Million –

fifty million

32. Name & Address of the

client organizations with

details of contact persons

for projects listed in 31

above. Please arrange to

provide the details below:

Load capacity (in KVA)

Contract period

115

Execution dates

Time taken for completion

(Attach proof like copy of

work order, performance &

completion certificates

etc.)

Contract amount

(attach documentary

evidence)

Customer contact name

and phone number & email

address

Any other information

necessary to support your

application.

33. Details of other key staff

who will be involved in the

project (Attach separate list

with CVs)

34. Is the organization bankrupt or being wound up, having its affairs administered by the court, or have you entered into an arrangement with creditors, suspended business activities or any analogous situation arising from similar proceedings in Kenya or the country in which it is established?

35. Please provide a statement

of any material pending or

threatened litigation or

other legal proceedings

where the claim is of a

value in excess of KES

500,000/= (equivalent to

USD 6,250).

36. Has any partner, director,

shareholder or employee

whom you would propose

to use to deliver this service

been convicted of an

offence concerning his

professional conduct?

37. Please state if your

organization or any of its

116

shareholders, directors, or

employees has ever been

the subject of public

allegations, under

investigation, charged,

prosecuted, or convicted,

has had its assets blocked,

seized or frozen or has a

judgment entered against

in respect of national or

international law relating to

the following; Money

laundering, economic

crime, corruption, bribery,

terrorism & any other

economic offence

38. Has the organization been

charged for not fulfilling its

obligations relating to the

payment of any statutory

deductions or contributions

including income tax as

required under Kenyan law

or the laws of the country in

which it is established?

39. Please state if any Director

shareholder/ Partner and /

or Company Secretary of

the Organization is currently

employed or has been

employed in the past three

years by Kenya Commercial

Bank Ltd.

40. Please state if any Director /

Partner and / or Company

Secretary of the

Organization has a close

relative who is employed by


Ltd and who is in a position

to influence the award of

any supply/contract. For

purpose of tender process,

close relative refers to

parents, siblings, spouse or

children

117


organization, any

predecessor to your

organization or any

member of your

organization is currently a

party to any litigation that is

in progress or has been

within the last three years

that is directly related to the

conduct of your business.


organization or any of its

shareholders, directors or

employees has ever offered

gifts or bribes to facilitate

award of business or to

facilitate payments or to

obtain business advantage.

43. Proposed contract period in

weeks for design, building,

shipping, delivery,

installation, testing and

commissioning (attach a

descriptive Gantt chart

copy).

Note: Please submit relevant photocopies of Registration/license/experience

/work order or other relevant document for above said declarations.

118

APPENDIX F – BILL OF QUANTITIES

PROPOSED POWER UPGRADE AT

KENCOM HOUSE

BILLS OF QUANTITIES FOR

ELECTRICAL INSTALLATION WORKS

BILL NO. 1

ITEM DESCRIPTION UNIT QTY RATE AMOUNT

A INCOMING POWER

SUPPLY AND GENERAL

ITEMS

A/1 Allow for incoming

electricity supply by KPLC

including metering

equipment (PROVISIONAL

SUM)

P.Sum 1 3,000,000.00 3,000,000.00

A/2 Supply, install and

connect complete 3

panel SF6 insulated,

indoor/outdoor non-

isolatable extensible

pattern, metal clad Ring

master switchboard

suitable for use on an

11Kv, 3 phase 3 wire,

50Hz, earthed neutral

system with an impulse

level of 95 Kv and fault

rating of 21KA for 3

seconds. The panel

being equipped with

2xHV cable boxes

suitable for accepting

cables from below and

comprising of the

following for the 2000kVA

transformer below under

item B/6 including all

fixing and connection of

all circuits from incoming

11kV power supply cable

by Kenya Power.

No. 1

119

1x200A circuit breaker

type CE2-T3/21. (incomer

panel with VIP300

protection plus metering

using PM810 meter)

2x200A circuit breaker

type CE2-T2/21. (incomer

panel without metering)

A/3 Supply, lay and connect

3-core 95 sq.mm 11kV

cabling between the

KPLC metering

equipment and the 11kV

switchgear under item

B/2 (The cable should be

as manufactured by East

African Cables).

LM 15

A/4 Supply, install, test and

commissioning of

2000kVA, 11 KV/433 V 3

phase ground mounted

transformer of cast-resin

(dry-type), with DYNII

connecting art,

hermetically sealed type

with cooling ONAN low

loss type and constructed

to British standard BS EN

60076 and the Technical

Specifications.

No. 1

A/5 Supply and install 2.5

sq.mm cu PVC/SWA/PVC

4-core cable laid in

channels between the

11kV switchgear feeder

and the IP65 emergency

stop in the MV switch

gear room.

LM 80

A/6 IP 65 - emergency stop

locks

No. 1

120

A/7 Heat shrink terminations

for item B/5 as Raychem

or equal and approved.

Set 8

A/8 Supply and install

earthing system complete

with 70 sq.mm copper

earth conductor, 1500mm

long x 15mm diameter

copper earth electrode

as Furse or approved

equivalent complete with

a driving tip and cable to

rod clamp,

300mmx300mmx300mm

deep concrete manhole

with a removable

waterproof cover,

marconite backfill for the

earth rod pit under item

B/6 all as per the

requirements of the

technical specifications.

Sum 1

A/9 Allow for providing

attendance as may be

necessary for KPLC

connecting up their MV

switchgear, 11kV

incoming underground

cables to customer MV

switchgear.

Sum 1

A/10 Supply and install

600x50mm powder

coated cable ladder for

medium voltage

incoming service lines

from Kenya Power

LM 75

A/11 Allow for any other works

indicated on the

drawings or in the

specifications but not

listed above to complete

the installation work for

the compliance with IEE

Item 1

121

Regulations and in

accordance with the

requirements of the

Kenya Power & Lighting

Company Ltd.

A/12 Allow for connection

units, bolts, nuts, cable

lugs, adaptable boxes,

supports, fixing, protective

painting, instructions of

owners, staff, samples

and tests, proposed

layout drawings and

record drawings.

Item 1

A/13 Allow for project site

administration works

which includes

preparation of program

of works, compliant to the

construction code,

construction safety code

and other necessary site

administration works.

Sum 1

A/14 Allow for necessary

submittals comprising

shop drawings,

illustrations, schedules,

product data, brochures,

samples and progress

photographs.

Sum 1

A/15 Allow for training of the

Client's maintenance

personnel in all aspects of

maintenance of the

entire electrical

installations (2 personnel

for 2 days)

Sum 1

A/16 Allow for supply of special

tools

Sum 1

A/17 Allow for supply of spare Sum 1

122

parts

A/18 Allow for factory

inspection of all

manufactured/fabricated

equipment prior to

delivery on site.

Sum 1

A/19 Allow for preparation of

operation and

maintenance manual

after complete

installation of the entire

electrical installations (3

sets)

Sum 1

A/20 Allow for the testing and

commissioning of the

incoming electricity

supply and low voltage

switchboard.

Sum 1

A/21 Allow for maintenance of

the 2000KVA transformer,

LV switchboard (old and

new) and the ring master

switchgear for a period of

3 years

Sum 1

A/22 Allow for assembly,

mechanical and

electrical operation of

11kV switchgear

Sum 1

A/23 Allow for Hot

commissioning once

mains supply is availed

Sum 1

A/24 Supply the following items

for fire fighting

(i) Fire ball code FES1 No. 20

(ii) 5kg fire extinguisher

Co2 code FEC005

No. 10

(iii) 9kg dry powder fire

extinguisher code FEDP09

No. 10

SUB-TOTAL CARRIED

FORWARD TO SUMMARY

123

PAGE

124


KENCOM HOUSE


ELECTRICAL INSTALLATION

WORKS

BILL NO. 2


B MAIN SWITCHBOARD

AND ELECTRICAL

DISTRIBUTION

B/1 Supply and install main

low voltage switchboard

type BLOKSET (Fully Type-

Tested Assemblies-TTA),

modular metal clad,

cubicle pattern, to IP31

form 3b, comprising of

Schneider Electric

switchgear or equal and

approved, as follows:

No. 1

Main Incomers: -

(i) 1No. Set of 3200A 4P

automatic changeover

switch, comprising of the

following: -

» 2No. 3200A motorized

4p ACB withdrawable,

type NW32H1, with

Micrologic 2.0E control

unit having adjustable

over current settings and

a short-circuit breaking

capacity of 65KA at

415V ac, 50HZ.B14

» 1No. Control unit for

auto changeover

» 1No. set of indicators to

show mains supply

available/in use or

generator supply

available/in use.

» 1No. Over/under

voltage sensing relay

» 1No. Set of relays

125

» 1No. Set of voltage free

normally closed/open

contacts for generator

start/stop signal.

(ii) 1No. Three-phase

surge arrestor type

DEHNventil DV TT 255

complete with

protection fuses.

(iii) 1No. Digital Energy

Multimeter type PM820

with RS485 modbus port

to monitor voltage,

current, KW, KWh, KVA,

frequency and power

factor, etc complete

with CTs and fuse

protection.

(iv) 3No. Phase presence

indicator lamps

Outgoers:-

(i) 1No. 2000A 3P ACB

withdrawable type (To

1000KVAR PFC Bank)

(ii) 1No 1600A 3P ACB

withdrawable type

(iii) 3No. 630A 3P MCCBs

(iv) 4No. 400A 3p

MCCBs

(v) 4No. 250A 3P MCCBs

B/2 Supply and install

earthing materials

comprising 1500mm

copper earth matts,

70mm sq. earth lead,

1800mm long x 15mm

diameter copper earth

electrode as furse or

approved equivalent

complete with a driving

tip and cable to rod

clamp,

500mmx500mmx500mm

deep concrete manhole

Sum 1

126

with a removable

waterproof cover,

marconite backfill for the

earth rod pit under item

B/7 all as per the

requirements of the

technical specifications.

B/3 Allow for labelling of the

LV switchboard under

Item C/1 above as per

the particular technical

specifications forming

part of tender

document.

Sum 1

B/4 Supply and install 1000

kVAr power factor

correction capacitor

bank type "BLOKSET"

(Fully Type-Tested

Assemblies-TTA),

modular, metal clad,

cubicle pattern, to IP20,

comprising of dry type

self-healing capacitors

type VARPLUS from

Schneider Electric,

complying with IEC 831

standards or equal and

approved:-

Sum 1

The PFC Bank will

comprise the following:-

(i) 19No. Varplus

Capacitor 50KVAR 415V,

50Hz, 3-phase

(ii) 2No. Varplus

Capacitor 25KVAR 415V,

50Hz, 3-phase

(iii) 21No. Special

contactors for capacitor

switching

(iv) 21No. Fuse bases

and fuses for each

capacitor protection

(v) 21No. Step indicator

127

lamps

(vi) 1No. Control circuit

protection fuse/fuse

holder

(vii) 1No. 12 step

automatic control

regulator for maintaining

power factor at the set

level and regulating the

switching of capacitor

steps

(viii) 3000/5A current

transformer (to be

mounted on the main

breaker)

B/5 Supply and connect 3-

core 95 sq.mm 11kV

cabling between the

2000kVA transformer and

the MV switchgear under

item B/2 (as

manufactured by East

African Cables).

LM 30

B/6 Supply and install 18x630

XLPE/PVC single core

cables from the 2000KVA

transformer to the new

main LV switchboard.

[The cables total run is

18x30m i.e. 510m]. (as


African Cables)

LM 540

B/7 Supply and install 7x630


cables from the 3200A

switchboard to the

existing LV switchboard

enclosed in channel and

cable ladders. [The

cables total run is 7x50m

i.e. 350m]. (as


African Cables).

LM 350

128

B/8 Heat shrink terminations

for item C/6 as Raychem

or equal and approved.

Set 4

B/9 Supply and install brass

compression cable

glands complete with

shrouds and nuts for item

under C/5 above.

No. 36

B/10 Supply and install cable

lugs item under C/5

above.

No. 36

B/11 Allow for bonding of all

metal works, transformer,

MV switchgear, cable

ladder, cable trunking,

pipe work building steel

structure, cable trays

etc. as shown in the

main LV switchboard

schematic wiring on

drawing E001. The earth

bonding shall be carried

out using copper

conductor of 70 sq.mm

copper conductive

conductor. The

termination shall be

done through cable lugs

bolted firmly to each

end of the earth terminal

block and the

equipment/structure

bonded.

Sum 1

B/12 Supply, install and

connect (in the new

switchroom) free

standing changeover

bypass type block (Fully

Type-tested Assemblies -

TTA), modular, metal

clad, cubicle patern to

No. 1

129

IP31, form 1B comprising

of Merlin Gerin

Switchgear or equal and

approved as follows for

KCB Moi Avenue Branch.

630A Changeover

bypass

1No. 630A 4P

changeover bypass

comprising of

2No. 630A 4P Manual

changeover switches

B/13 Supply and install 4/c

185mmsq

cu/XLPE/SWA/PVC cable

from the new LV

switchboard to the Data

Centre sub board B and

remove the supply link

from the existing LV

switchboard to sub

board B. (as


African Cables).

Lm 50

B/14 Supply and install 4/c

185mmsq

cu/XLPE/SWA/PVC cable

from the new LV

switchboard to the 630

bypass above and

connect as follows and

as manufactured by East

African Cables:

Lm 50

(i) Feeder 1: From sub

board B

(ii) Feeder 2: From the

new LV switchboard

The existing 4/c

120sqmm cable will

remain as the supply to

the branch.

B/15 Supply and install

300x50mm powder

LM 120

130


low voltage incoming

service cables for the

client's utilities

B/16 Supply, lay and connect

new 8x630sqmm


cables from the

2x500KVA standby

generators in the lower

basement to the new LV

switchboard. (The total

cable run is 8x50 = 400)

(as manufactured by

East African Cables).

LM 400

B/17 Allow for relocating the

existing cables from the

generator in the upper

basement to the new LV

switchboard

(4x630sqmm)

sum

B/18 Allow for transferring the

power cables (generator

in the upper basement)

from the existing LV

switchboard to the new

one.

sum 1


70sqmm XLPE/PVC single

core cable for

generators earthing (as


African Cables).

Lm 90


300x50mm powder


the maintained supply

cable

Lm 160

B/21 Allow for

decommissioning of the

No. 1

131

existing power factor

correction capacitor

bank from the existing LV

switchboard.

B/22 Allow for

decommissioning of the

existing automatic

changeover, system and

its cabling from the

existing LV switchboard

and the standby

generator.

Sum 1

B/23 Allow for testing and

commissioning the entire

electrical installations

under this section.

Sum 1

B/24 Supply and install 25mm

x 3mm horizontal

conductor copper tape

complete with saddles,

clamps and all other

necessary accessories

(Provisional Quantity) as

Furse or equal

equivalent.

LM 100

B/25 Supply and install lighting

points wired in 3x1.5

sq.mm PVC single core

cables running on a

150x50mm metal

trunking at high

level/surface galvanized

steel conduits without

switching accessories.

No. 17

B/26 Supply, install, connect,

testing and

commissioning the

following light fittings

complete with lamps as

follows:

132

a) 2x58watts 1500mm dust

tight and jet proof

luminaire of grp body

and stippled bowl

complete with integral

control gear and lamps

similar to Thorn LU

No. 12

b) 8watts single sided

flourescent emergency

exit sign fitting with 3hour

duration and of steel

construction similar to

Thorn EFX3.

No. 5

B/27 Allow 2.5 sq.mm PVC, 3-

core heat resistance

flexible cable for

terminating light fitting

under C/17 above

M 40


connect the following

metal clad switches on

surface mounted switch

box wired in 1.5 sq.mm

PVC single core cables

enclosed in surface

mounted galvanised

steel conduits.

a) 1 gang 1 way switch as

MK or approved

equivalent

No. 3

b) 1 gang 2 way switch as

MK or approved

equivalent

No. 2


connect 13Amp twin

metal clad socket outlets

complete with HG

PVC/galvanized steel

conduit wired in 3x2.5


cables as ring main

circuit and all

accessories necessary

No. 8

133

for recessed/surface

mounting.


connect 15Amp twin

metal clad socket outlets

complete with HG

PVC/galvanized steel

conduit wired in 3x4.0


cables as ring main

circuit and all

accessories necessary

for recessed/surface

mounting.

No. 2


sq.mm XLPE/SWA/PVC 4-

core cable from the LV

switchboard enclosed in

trench/cable tray to sub-

board TP in the power

room (as manufactured

by East African Cables).

LM 20


Amps, TP/N distribution

sub-board TP complete

with all MCCB's and PVC

blanking plate for the

spare ways as per the

drawings and any other

necessary accessories as

Merlin gerin or approved

equivalent.

No. 1

SUB-TOTAL CARRIED

FORWARD TO SUMMARY

PAGE

134


KENCOM HOUSE



WORKS

BILL NO. 3


C ELEMENT NO 1

DEMOLITIONS

The items of demolitions

and removal shall

include making good

disturbed areas to

match existing, keeping

on site all salvage

materials for client's use

and loading and carting

away debris unless

otherwise specified.

C/1 Allow a provisional sum

of fourty thousand

shillings for demolitions of

existing structures with a

plinth area of 10SQM

Item 1 40,000.00 40,000.00

C/2 Carefully demolish

200mm thick masonry

wall

Sum 106

C/3 Carefully remove

existing 2000x2000mm

high steel double door

No 1

C/4 Hack existing concrete

surface to allow for

placing of hardcore

(m/s)

Sum 67

ELEMENT NO. 2

SUBSTRUCTURE

CONCRETE

Vibrated reinforced

concrete class 25/20mm

(1:1:5:3) aggregate as

described in:

135

C/5 400mm thick ground

floor slab

Sum 90

Steel reinforcement

Supply and fix bar/rod

reinforcement including

bending hooks tying

wire cutting, spacers

and supporting all in

position as described.

C/6 High tensile square

twisted bards to B.S.4461

Reinforcement of

assorted sizes

KG 2010

C/7 Sawn formwork as

described to:

Edges slab between

400mm high

LM 38

C/8 Damp proof membrane

200mm wide hessian

based dampproof

course levelled with 11:4

cement sand mortar

LM 31

ELEMENT NO. 3

WALLING, STRUCTURAL

STEEL & DOORS

Louvered walling

C/9 200mm thick precast

concrete vent blocks

louvered walling jointed

and bedded om

cement sand mortar

Sum 102

Steel reinforcement

Mild steel rectangular

hollow sections primed

with red lead oxide

136

before fixing and fillet

welded together as

directed in:

C/10 50x50x4mm thick angle

line to hold RHS (m/s

LM 45

C/11 50x50x4mm thick RHS in

grating

LM 105

C/12 6mm thick mild steel

chequered plate

sum 80

Doors

Supply and fix the

following purpose made

doors

Steel metal door

C/13 Door size 2000x3000mm

high lourved steel metal

double door comprising

50x50x2mm thich SHS

framework; the door

infilled with 3mm thick

mild steel lourves,

complete with 3 pairs of

100mm heavy duty steel

butt hinges, 1No. Heavy

duty 20mm diameter all

drops, 2No. heavy duty

20mm diameter barrel

bolt.

No. 7

Painting

Prepare and apply one

undercoat and two

finishing coats of gloss oil

paint to:

C/14 General surfaces of

metal

sum 36

Sub-total carried forward

to Summary page

137


KENCOM HOUSE



WORKS

BILL NO. 4


D SUPPLY FAN 1

D/1 Adjustable Pitch

Aerofoil supply fan

capable of a volume

flow rate of 2m3/s

against a total pressure

drop of 200N/m2

Fan to be an aerofoil

extract fan complete

with supports, flexible

connections and anti-

vibration mountings.

Fan as "WOODS" Model

No. 71JM/20/4/6 with a

Pitch Angle of 8 deg.

Running at 1440 RPM, a

Power Supply of 1.4 kW

415V 50Hz and a total

weight of 198kg or

equal and approved.

Sum 1

Supply Fan 2

D/2 Adjustable Pitch

Aerofoil extract fan

capable of a volume

flow rate of 2m3/s

against a total pressure

drop of 150 N/m2

Fan to be an aerofoil

extract fan complete

with supports, flexible

connections and anti-

vibration mountings.

Fan as "WOODS" Model

No. 63JM/25/6/9 with a

No 1

138

Pitch Angle of 28 deg.

Running at 935 RPM, a

Power Supply of 1.55

kW 415V 50Hz and a

total weight of 85kg or

equal and approved.

Duct work

Galvanised mild steel

ductwork complete

with Bends, offsets,

hangers, supports,

sleeves, flanges, Access

doors, Test Holes,

stiffeners etc.

Supply Duct

D/3 800x650mm duct made

out of 0.8mm thick GMS

sheet

Lm 120

Exhaust Grille

D/4 700x700 large format

single deflection Heavy

duty aluminium exhaust

grille with individually

adjustable vanes at

38mm pitch, screw

fixed through nylon

bearings to prevent

vane vibration and

rattle. Waterloo Type

1K.

No. 2

Supply Grille

D/5 600x600 large format

single deflection Heavy

duty aluminium exhaust

grille with individually

adjustable vanes at

38mm pitch, screw

fixed through nylon

bearings to prevent

vane vibration and

rattle. Waterloo Type

No. 4

139

1K with opposing blade

dampers.

Dampers

D/5 800x650mm damper for

duct mounting with a

facility for adjustment

outside duct.

No. 2

Weather Grilles

D/6 Allow for a weather

grille approximately

1600x1800mm made

out of mild steel bars of

minimum 2mm

thickness.

No. 2

Internal Grilles

D/7 Allow for internal Air

Transfer grilles

approximately

700x700mm made out

of aluminium extrusion

with tubed cores and

mitred, welded frames.

The grille shall be as

"Waterloo Series NS"

No. 2

Supply Air Filter Box

D/8 Allow for a filter box

approximately

1400x1600x100mm thick

made out of 1.2mm

thick GMS sheets

complete with the

necessary filters and

filter brackets and

fixtures for 2m3/s air

flow.

No. 2

140

D/9 Allow for the removal of

existing steel grille to

allow for the installation

of the supply fan, filter

box and weather grille

and then the re-

installation of the same

steel grille and making

good by painting and

builders works.

No 2

Removal of the Existing

ductwork

D/10 Allow for the removal of

the existing or adapting

the existing ductwork

as necessary

Item 1

Electrical wiring

D/11 Allow for the electrical

wiring from the nearest

consumer untis to the

fans stated above

including the nessary

switching and safely

electrical appliance

Item 1

Testing and

Commissioning

D/12 Allow for setting to

work, testing and

commissioning of the

whole of the above

installations.

Item 1

Sub-total carried

forward to Summary

page

141

PROPOSED POWER UPGRADE

AT KENCOM HOUSE



WORKS

SUMMARY PAGE


A PRELIMINARIES AND

GENERAL ITEMS

450,000.00 450,000.00

B INCOMING POWER

SUPPLY AND GENERAL

ITEMS

C MAIN SWITCHBOARD

AND DISTRIBUTION

D BUILDERS WORKS

E MECHANICAL

VENTILATION

F SUB-TOTAL FOR ITEM A,

B, C, D AND E ABOVE

G Add 10% of sub-total of

item F above as

Contingency sum to be

used at the discretion of

the Project

Engineer/Client

H Sub-total

I Add 16% VAT from Item

H ABOVE

TOTAL FOR ELECTRICAL INSTALLATIONS

C/F TO FORM OF TENDER