8 elect inst single phase measurement

MECHANICAL & ELECTRICAL WORKS

MEASUREMENT (SBEQ3213) Week 8 : Electrical Installations – Single Phase

Sr. Dr. Sarajul Fikri Mohamed

Faculty of Built Environment

Cold Water Installations PLUMBING WORKS

Electrical Installations

Fire Fighting System

MAIN COURSE COMPONENTS

Air Conditioning Installations

Unit/Split Package/Central

Single Phase Three Phase

ELECTRICAL WORKS

MECHANICAL WORKS

Soil & Waste Pipes/Sanitary Fittings

Underground Drainage

1. Electrical installations: main components

2. SMM2 measurement rules for electrical installations

3. Taking off list for electrical installations

4. Heading and description.

5. Case study: CADANGAN MEMBINA DEWAN

SERBAGUNA TAMAN KOTA JAYA, KOTA TINGGI, JOHOR

TABLE OF CONTENTS

© 2009 Sarajul Fikri Mohamed

ELECTRICAL INSTALLATIONS AND MAIN COMPONENTS

POWER TRANSIMISSION & DISTRIBUTIONS

• From substation to substation

External Supply

• From DB to power points and fittings

Internal Supply • 240V with

a less load and domestic use

Single Phase

• 415V with a bigger load and supply needed for (commercial and industrial)

Three Phase

Two options

TYPES OF ELECTRICAL WORKS INSTALLATIONS

Carrying voltage is 415 v and can exceed 880 v for industrial user. The industries that use heavy machineries such as steel factory and cement factory need to have three phase electrical system.

Three phase systems may have three live wire and neutral wire

Live wires identified based on colour coded and the code are as follows:

LI or R (red): Single Phase

L2 or Y (yellow): Second Phase

L3 or B (blue) : Three Phase

For domestic uses, three phase voltage are very high and dangerous to the home owner Therefore, low voltage electrical supply normally used for domestic use such residential Standard voltage for single phase is 240 v. Normally one live wire will be used with one neutral wire. The code are as follows:

RN YN BN

Three Phase

Single Phase

SINGLE AND THREE PHASE THEORY

INCOMING SERVICES

MAIN INSTALLATION

POWER INSTALLATION

LIGHTING INSTALLATION

CABLES

ELECTRICAL APPLIANCES

CONDUIT AND FITTING

LIGHTNING PROTECTION SYSTEM

TESTING

MAIN COMPONENTS ELECTRICAL INSTALLATIONS – SINGLE PHASE

INCOMING SERVICES

MAIN INSTALLATION

POWER INSTALLATION

LIGHTING INSTALLATION

ELECTRICAL APPLIANCES

FINAL SUB-CIRCUIT

CABLE

CONDUIT

LIGHTNING PROTECTION

TESTING

ELECTRICAL DISTRIBUTION IN BUILDING

POWER

INSTALLATION

LIGHTING

INSTALLATION

ELECTRICAL

APPLIANCES

3 pin switch socket Fluorescent light

Wall light

EXIT sign

High bay light

EL light

Exhaust fan

Sweep ceiling fan

CONDUIT &

FITTING

CABLES TESTING

Chased into brickwall

Ceiling level

2x1c/2.5mm PVC cable

2x1c/1.5mm PVC cable

On completion of the electrical installation test all switches, switch socket, wiring etc and make good all defects an leave everything perfect working order to the satisfaction of the S.O and TNB

MAIN COMPONENTS ELECTRICAL INSTALLATIONS

ELECTRICAL TYPICAL LEGEND IN M&E DRAWINGS

DB & FUSES ELCB

MAIN SWITCH FUSE

TNB METER

CUT OFF FUSE


SMM2 MEASUREMENT RULES

MEASUREMENT RULES ELECTRICAL INSTALLATION

29

CLAUSE DESCRIPTION

R4-R5 Equipments and Control Gear

R6-R8 Fittings and Accessories

R9-R13 Conduits, trunking and cable tray

R14-R17 Cabling

R18 Final Sub-circuits

R19 Earthing

R20-R21 Ancillaries

R22 Sundries

R23-R24 Builder’s Work

RELATED SMM2 CLAUSES ELECTRICAL INSTALLATIONS

PREAMBLE

GENERAL NOTES

1) MAIN INSTALLATION

– Meter panel (no)

– Main Switch Board (no)

– Distribution Board (no)

Main & sub main cabling (m)

Conduit and trunking (m)

Sundries (no)

Testing (item)

2) POWER INSTALLATION

– Fittings and accessories

• Socket (no)

• Point (no)

– Cables (m)

– Conduits (m)

– Sundries

• Mark the holes (item)

• General earth bonding (item)

• Testing (item)

TAKING OFF LIST ELECTRICAL INSTALLATIONS

3) LIGHTING INSTALLATION – Fittings & accessories

• Swicth (no) • Point (no)

– Final sub-circuit (no) – Sundries

• Mark the holes (item) • General earth bonding (item) • Testing (item)

4) ELECTRICAL APPLIANCES

– Fittings & accessories

• Swicth (no)

• Exhaust fan, ceiling fan (no)

– Final sub-circuit (no)

– Sundries



• Testing (item)

5) LIGHTNING INSTALLATION (3 phase) – Copper tape (no) – Test clamps (no) – Air termination (no) – Earth chamber(no)

6) SUNDRIES

• Mark the holes (item) • Testing (item)

7) BUILDERS WORK

– Excavation trenches (m)


MEASUREMENT RULES ELECTRICAL INSTALLATIONS

ELEMENT: ELECTRICAL SERVICES ubb/N/01

BIL UNIT KUANTITI

A Preamble

B

M 3.05

M 3.05

C

M 1.00

M 1.00

To Collection

All quantities in this bill are provisional quantities

subject to remeasurement upon construction of the

said item. The tenderer must allow for testing the

electrical installation and handling over of test

certificate to S.O.

Incoming Services-Externally (All Provisional)

25mm x 25mm Telekom PVC trunking from lighting

arrestors run at high level and drops to computer

server.

100mm UPVC class 'D' pipe complete with long

bend extended beyond drain for entry of TNB,

incoming cable to MSB inclusive of excavation and

backfilling.

4 x 25mm² pilestas (AC) cable in UPVC class 'D'

pipe (m/s) buried underground to TNB panel.

75mm x 38mm electrical trunking from meter to

DB/M3B.

Incoming Services-Internally (All Provisional)

Cadangan Membina Dan Menyiapkan Sebuah Makmal Komputer Di Sekolah Kebangsaan Sri

Selangor, Petaling Jaya, Selangor.

KETERANGAN HARGA

(RM)

JUMLAH

(RM)

BILLS OF QUANTITIES FOR:

INCOMING SERVICES

EQUIPMENT AND CONTROL GEAR (NO)

R4 – Equipment (generator, motors)

Control gear (isolator, switch fuses)

Packaged item described with a manufacturer’s detail.

Limiting dimension on size shall be given.

Connecting cable ends or cable tails shall be deemed to be included with the item.

Platework and supporting steelwork – Section P.


Equipment and Control Gear

Main Installation - Manufacturer’s details and dimension on size


Usually for houses and small loaded.

Situated inside building.

Including equipment such as circuit breaker and fuse

SMM2 Refer to clause R.4.1(NO.)

DISTRIBUTION BOARD ELECTRICAL INSTALLATIONS

HEADING AND DESCRIPTION MAIN INSTALLATIONS 1. EQUIPMENT AND CONTROL GEAR

Item Description Unit Qty Note

A

B

Equipment and Control Gear

240 volt metal clade main switch board, 1 phase of wall mounted floor standing type and including fuse swithches, RCCV’s, copper busbar, voltmeter, ammeter, current transformer, light indicator, cable box and all associated accessories. TNB metre board control gear complete with cut out fuse holder and neutral link with facilities for termination of incoming supply cable for wiring connection main switch distribution board and fuses 60A current operated ELCB complete with earthing elctrode.

No

No

2

1

2. Power Installation - fitting & accessories = socket no - cables m - conduits m - final sub-circuit no - sundries

= mark holes item = general bonding item = testing item

TAKING OFF LISTS DOMESTIC – HOUSING SINGLE

PHASE

Switch socket outlet & socket point.

Different Types for different capacity.

SMM2 Refer to clause R.18.2 (No.)


HEADING AND DESCRIPTION POWER INSTALLATIONS 2. POWER INSTALLATIONS (Internally)


A

B

Cables

2 x 1.5mm2 Polyvinyl chloride (cu) and 1.5mm2 PVC green cable in concealed conduit, chased in brickwall 1450mm above floor finish. 2 x 2.5mm2 Polyvinyl chloride (cu) and 2.5mm2 PVC green cable in concealed conduit, chased in brickwall 900 mm above floor finish.

Conduit

20mm diameter PVC conduit embedded into brickwall 1450mm above floor finish level.

Fitting and Accessories

1 Gang 13 Amp switch socket outlet with PVC face plate, steel box and fused plug top fixed to brickwall mounted and connected at 1450mm above floor finish level

m

m

m

No

35

20

35

18

CONDUIT, TRUNKING AND CABLE TRAYS

R9.1 – Conduit and fittings. (m)

a) type

b) size

c) specification

d) saddles & crampets pattern

e) nature of background

Except for final sub-circuit (measured overall conduit fittings) e.g tees, elbows, bend, cover plates, bushes, locknuts, nipples, stopping-lugs and reducing bushes), short running lengths and branches).


PVC Conduit

Galvanized Iron Conduit

CONDUIT, TRUNKING AND METAL TRAY ELECTRICAL INSTALLATIONS

CONDUIT, TRUNKING AND CABLE TRAYS

Classification :

a) conduits fixed to surfaces

b) conduits fixed in chases

c) conduits embedded in floor screeds

d) conduits embedded in concrete


Conduit inside the suspended ceiling


Conduits fixed in chases brick wall


Drilling works to chases wiring to the brickwall


12/31/2014

CABLES

R15.1 – Cables (m) measured as the net length of the conduit, trunking or tray.

other cable measured as fix (without any allowance for sag) between boxes, equipment control gear, fittings, accessories etc.

except for final sub-circuits.


Cables

R15.2 Cables (m)

i) Type ii) Size iii) Classification

CLASSIFICATION

a) drawn into conduits or ducts

b) laid or drawn into trunking

c) laid or drawn into trunking and laced into ciucuit

d) fixed to surfaces

e) wrapped around pipework

f) laid in trenches

g) fixed to insulators in overhead lines

h) suspended from catenary cables


Underground cable Bracket to wall Embedded to wall

CABLE CLASSIFICATION ELECTRICAL INSTALLATIONS

CABLE

R17 Connections to public mains, making good public highway and other work which may only carried out by Public Undertaking or Local Authority – PROVISIONAL SUM


FINAL SUB-CIRCUITS

R18.1 Distribution sheets and drawing showing layout shall be given.

R18.2 Points (NO) i) cable & conduit installations

ii) ampere rating

iii) classification CLASSIFICATION a) Lighting points: one way or two way b) Socket or switch socket points c) Immersion heater points, cooker outlet points etc.


3. Lighting Installation - fittings & accessories = switch no - cables m - conduits m - final sub circuit no - sundries = mark holes item = general bonding item = testing item

TAKING OFF LISTS DOMESTIC – HOUSING SINGLE PHASE

HEADING AND DESCRIPTION LIGHTING INSTALLATIONS 3. LIGHTING INSTALLATIONS (Internally)


A

B

C

D

E

Cables

2 x 1.5mm2 Polyvinyl chloride (cu) and 1.5mm2 PVC green cable in concealed conduit, chased in brickwall 1450mm above floor finish. 2 x 2.5mm2 Polyvinyl chloride (cu) and 2.5mm2 PVC green cable in concealed conduit, chased in brickwall 900 mm above floor finish.

Conduit

20mm diameter PVC conduit embedded into brickwall 1450mm above floor finish level.


1 X 36w bare channel wall fluorescent light fitting come with prismatic diakon diffuser

26W downlight complete with fittings wire, connector blocks and fixed to brickwork or concrete on ceiling surface. Connect to fix lamps

m

m

m

No

No

12

30

12

18

20

4. Electrical Appliances - fitting & accessories = switch no - cables m - conduits m - final sub circuit… no - sundries = mark holes item = general bonding item = testing item

TAKING OFF LISTS DOMESTIC – HOUSING SINGLE PHASE

HEADING AND DESCRIPTION POWER INSTALLATIONS 4. ELECTRICAL APPLIANCES (Internally)


A

B

C

D

E

Cables

2 x 8mm2 PVC cable in concealed galvanised iron conduit come with 1 x 8mm2 PVC CPC Conduit

25mm diameter PVC galvanised iron conduit concealed to brickwall for exhaust fan


150mm x150mm metal exhaust fan install at high level complete with support brackets, flexible connectors and vibration. 1 gang 15 Amp switch outlet for exhaust fan with PVC plate box and fixed to brick wall

Final Sub-Circuit Final sub-circuit fir 15A socket point for metal exhaust fan of concealed conduit cable installation consisting od 2 x 8mm2 single core cable drawn into galvanised iron conduit.

m

m

No

No

No

15

35

5

5

5

Fan, MATV point and telephone point.

SMM2 Refer to clause R.6, R.22.1 (NO.)

ELECTRICAL APPLIANCE ELECTRICAL INSTALLATIONS

Cable

Life

Neutral

Pow

er

Fuse Box

Earth

Socket

Light Point

Switch

Cable

Final Sub-circuit

Life

Neutral

Ligh

tin

g

Fuse Box

Cable (m)

Final sub-circuit (nos)

Stating the ampere rating based on classification of

point.

FINAL SUB-CIRCUIT ELECTRICAL INSTALLATIONS

SUNDRIES

R22.1 Marking the position of holes, mortice, chases & the like (ITEM)

R22.2 General earth bonding & earthing (ITEM)

R22.3 Disconnecting, setting aside & refixing equipment (ITEM)

R22.4 Temporary operating each installation (ITEM)

R22.5 Testing each installation (ITEM)

R22.6 Preparing plans or diagrams of the installations (ITEM)



TAKING OFF LIST

Preamble

General notes

Main installation

– Meter panel (no)

– Main Switch Board (no)

– Distribution Board (no)

Main & sub main cabling (m)

Conduit and trunking (m)

Sundries (no)

Testing (item)

Power installation

– Fittings and accessories

• Socket (no)

• Point (no)

– Cables (m)

– Conduits (m)

– Final sub circuit (no)

– Sundries



• Testing (item)


Lighting installation – Fittings & accessories

• Swicth (no) • Point (no)

– Final sub-circuit (no) – Sundries

• Mark the holes (item) • General earth bonding

(item) • Testing (item)

Lightning installation – Copper tape (no) – Test clamps (no) – Air termination (no) – Earth chamber(no) – Sundries

• Mark the holes (item) • Testing (item)

Builders work – Excavation trenches (m)


THANK YOU for your kind attention

8 elect inst single phase measurement

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