halve high voltage safety rules handbook

High Voltage Safety Rules Handbook

Created By: Avonside Safety Management HALVE-TA-HVSMS-V1.0B

Printed or Downloaded Copies are Uncontrolled

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Date Created: October 2018 Issue: 1.0B

Date Revised: May 2019

HaLVE High Voltage Safety Rules Handbook

Version 1.0B




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Document Control Sheet

Version Date Amendment Reason

1.0D 21st February 2019

Draft Version -

1.0A 13th May 2019 Update

1.0B 14th May 2019 Final Issue




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Electrical Safety Rules

Agreement

Below, you will find a declaration. By signing it you are confirming that you have received training on these rules and you are making a personal commitment to follow these procedures. Before you sign it, make sure that:

• Your Authorisation Certificate permits you to carry out those tasks, which your duties require you to carry out.

• You have been trained in, and understand these rules.

• You understand the duties you are expected to carry out. If you have not signed your personal copy of the rules, you cannot continue to work under

these Procedures

Agreement

(Sign this copy and retain it within this book)

• I have read these rules and understand its content relevant to my designated duties and responsibilities as set out on my Certificate of Authorisation

• I understand my duties set out in these rules

• I agree to comply with the requirements of these rules

Name: (Block caps)

………………………………………………………………

Company: ………………………………………………………………

Signature: ………………………………………………………………

Date: ………………………………………………………………

Rule Book No: ………………………………………………………………




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HaLVE High Voltage Electrical Safety Rules

Foreword / Safety Statement / Meaning of Terms

1. Foreword ............................................................................................................... 7

2. Safety Statement ................................................................................................... 7

3. Scope of these Safety Rules ................................................................................. 7

4. The ‘Control Person’ function ................................................................................ 8

5. Meaning of terms used in these Rules .................................................................. 8 SECTION 1 - GENERAL PROVISIONS

1.1 Introduction ........................................................................................................... 9

1.2 Organisation Responsibility ................................................................................... 9

1.3 Responsibilities Required by Law ......................................................................... 9

1.4 Specific Electrical Responsibilities ........................................................................ 10

1.5 Training and Assessment ...................................................................................... 10

1.6 Scope and Application of the Rules ....................................................................... 10

1.7 Issue of Safety Rules ............................................................................................ 10

1.8 Variation of the Safety Rules ................................................................................. 10

1.9 Special Procedures ............................................................................................... 11

1.10 Objections ............................................................................................................. 11

1.11 Incident Reporting ................................................................................................. 11 SECTION 2 - DEFINITIONS .......................................................................................... 13 SECTION 3 - GENERAL SAFETY PRECAUTIONS

3.1 On-site Risk Assessments .................................................................................... 15

3.2 Personal Protective Equipment ............................................................................. 15

3.3 Safety Objections and Reporting ........................................................................... 15

3.4 Interference with Safety Precautions ..................................................................... 15

3.5 Access to and Work in Substations ....................................................................... 15

3.6 Access to High Risk work areas ............................................................................ 15

3.7 Fire Protected Areas ............................................................................................. 16

3.8 Switching on High Voltage Systems ...................................................................... 16

SECTION 4 - SAFETY PRECAUTIONS FOR WORK ON OR NEAR HIGH VOLTAGE SYSTEMS

4.1 General Requirements .......................................................................................... 18

4.2 Safety Precautions and Procedures for work on particular items of

High Voltage Apparatus and Conductors .............................................................. 19

4.3 Isolation of High Voltage Apparatus and Conductors ............................................ 20

4.4 Earthing of High Voltage Apparatus and Conductors ............................................ 20

4.5 Permit-to-Work ...................................................................................................... 22

4.6 Sanction-for-Test .................................................................................................. 24

4.7 Limitation-of-Access .............................................................................................. 25




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SECTION 5 - RESPONSIBILITIES OF PERSONS

5.1 General ................................................................................................................. 27

5.2 Competent Persons .............................................................................................. 27

5.3 Authorised Persons ............................................................................................... 28

5.4 Senior Authorised Persons ................................................................................... 29

5.5 Control Person (Duty Senior Authorised Person) .................................................. 30

APPENDICES

1 Permit-to-Work format ........................................................................................... 31

2 Sanction-for-Test format ....................................................................................... 33

3 Limitation-of-Access format ................................................................................... 35

SAFETY RULES PROCEDURES

SRP1 - High Voltage Switching ............................................................................... 38

SRP2 - Earthing of High Voltage Apparatus ............................................................. 50

SRP3 - Work on High Voltage Metalclad Switchgear ................................................ 54

SRP4 - Work on High Voltage Cables ...................................................................... 62

SRP5 - Work on Transformers ................................................................................. 80

SRP6 - Access to Substations and Operational Areas ............................................. 84

SRP7 - Testing HV Apparatus .................................................................................. 88

SRP8 - Areas with Automatic Fire Suppression Systems .......................................... 92

SRP9 - Procedure for the use of Contractors working on HV systems ...................... 96

SRP10 - Procedures when normal Safety Document and Key Procedures cannot be complied with ............................................................ 110

SRP11 - Excavation and Safe Digging ................................................................................ 114

SRP12 - Authorisation Procedures ............................................................................. 118




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1. FOREWORD

1.1 Every Company has a duty under the Health and Safety at Work Act 1974 to prepare and issue a general safety policy on health and safety at work including the organisation and arrangements for carrying out that policy.

1.2 Every Company also has a responsibility under the Management of Health and Safety at

Work Regulations 1999 to make a suitable and sufficient assessment of the following:

(i) The risks to health and safety of its employees to which they are exposed whilst they are at work.

(ii) The risks to the health and safety of persons not in its employment, but who may be affected by the Company as it conducts its everyday business.

1.3 These Safety Rules identify the measures to be taken to comply with the duties placed on the Company under the relevant statutory provisions with regard to the inherent Dangers from electricity generation and distribution Systems.

2. SAFETY STATEMENT

The Company has moral and legal duties, as well as financial reasons, to protect staff from harm while they are at work.

Moral: No one should be exposed to the risk of injury or health problems at work.

Legal: The Law insists that employers create a safe working environment.

Financial: Accidents are very costly to all concerned. Safety is good business.

IMPORTANT!

These Safety Rules are designed to show you the correct way to carry out work safely and legally.

(i) You will be trained in its use and the role(s) you are expected to undertake.

(ii) You will be given a written statement (your Authorisation Certificate) which shows the tasks you are allowed to undertake.

(iii) You must have access to all necessary safety equipment described in these rules.

(iv) This numbered book is your personal copy. It is recorded on a database.

(v) You must look after it and present it for inspection whenever requested.

3. SCOPE OF THESE SAFETY RULES

3.1 These Safety Rules are part of the HaLVE’s Safety Management System for the effective management of operations and work activities on HV electrical Systems under the control of HaLVE.

3.2 In the application of these Safety Rules it is important that the boundaries of responsibility for any System is clearly identified and the responsibility of who has operational control of isolating and earthing devices at these boundary points is also clearly understood.

3.3 Where Systems being worked on under these Safety Rules interface with other electrical Systems, it is vital that these boundary points are clearly identified and appropriate safety measures are in place to prevent Danger from these other Systems or energy sources.




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4. THE ‘CONTROL PERSON’ FUNCTION

4.1 For safe management of electrical Systems, it is most important that the delegation of the ‘Control Person’ function is clearly defined and understood.

4.2 When work or testing is required to be carried out on a defined part of a HV System a Senior Authorised Person Shall assume the role of Control Person and take operational responsibility for the defined section of the System and decide upon the precautions necessary to achieve safety from the System. Under these Safety Rules it is permissible for one Person to undertake the roles of both Control Person and Senior Authorised Person if the Switching is to be completed in accordance with an approved Switching schedule.

4.3 Under these Safety Rules it is permissible for one Person to undertake the roles of both Control Person and Senior Authorised Person if the Switching is to be completed in accordance with an approved Switching schedule.

5. MEANING OF TERMS USED IN THESE RULES

SHALL

Where 'Shall' is used in these Rules with no qualifications, this indicates a mandatory requirement with no discretion permitted and no judgement to be made. SHALL, WHERE PRACTICABLE

Where 'Shall' is qualified by the word 'practicable', a slightly less strict standard is imposed. Where the physical means exists to achieve the requirement, but bearing in mind the hazards associated with the work to be undertaken, then the requirement must be met. One is not allowed to avoid the requirement on the grounds of difficulty, inconvenience or cost.

SHALL, WHERE REASONABLY PRACTICABLE

When 'Shall’ is qualified by the words ‘where reasonably practicable' then a judgement must be made as to what is reasonable, taking into account the magnitude of the risk on the one hand and the cost, time and trouble, or effort necessary for averting the risk on the other hand.




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SECTION 1 - GENERAL PROVISIONS 1.1 INTRODUCTION

1.1.1 The Health and Safety at Work Act 1974 states.

“It Shall be the duty of every employer to ensure, so far as is reasonably practical, the health, safety and welfare at work of all his employees”

“It Shall be the duty of every employee while at work to take reasonable care for the health and safety of himself and of other persons who may be affected by his acts or omissions at work”

1.1.2 The Company recognises and accepts its moral and statutory duty to

(i) Provide and enforce safe methods of working.

(ii) Provide healthy working conditions.

1.1.3 All employees must co-operate and comply with these safety requirements and must also use the personal protective equipment (PPE) provided for specific tasks.

1.1.4 Persons who have concerns about any instruction given or activity taking place must report his objection to his supervisor.

1.2 ORGANISATIONAL RESPONSIBILITY

The responsibility for effective safety management in the Company rests with the Board of Directors. Responsibility for the execution of the safety procedures (policy writing, training, assessment and enforcement) will be delegated to named officers/ positions within the management structure.

1.3 RESPONSIBILITIES REQUIRED BY LAW

The Law sets out duties upon employers and employees as detailed below.

1.3.1 Company responsibilities:

(i) To examine what work activities could cause harm and carryout appropriate risk assessments for these activities.

(ii) To provide safe work procedures that comply with the latest safety legislation.

(iii) To train all staff who need to work to those procedures.

(iv) To assess that those staff have sufficiently understood the procedures.

(v) To ensure that Safety Rules are enforced and used by all staff.

(vi) To provide all necessary Personal Protective Equipment (PPE).

(vii) Review and revise the safety procedures when required. 1.3.2 Managers responsibilities

(i) Ensure that their staff are trained and assessed for the work that they do.

(ii) Ensure Safety Rules are being complied with at all times.

1.3.3 Supervisors responsibilities

(i) Only issue work instructions to cover work that can be completed under the scope of these Safety Rules.

(ii) Enforce the application of the Safety Rules at all times.




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1.3.1 Operators/staff responsibilities

(i) Only work in accordance with the Safety Rules.

(ii) Report any safety concerns or events to their supervisor.

(iii) Always use PPE when required by the Safety Rules. 1.4 SPECIFIC ELECTRICAL RESPONSIBILITIES

To achieve the requirements set out in Section 1.3, the Company have defined the following Authorisation levels for work on electrical generation and distribution HV Systems.

Competent Person

Authorised Person

Senior Authorised Person

Control Person

A definition of each category of Person is contained within Section 2 - Definition D20.

1.5 TRAINING AND ASSESSMENT

The following provisions Shall apply:

(i) Staff Shall be trained in the duties and procedures they are required to work to.

(ii) Staff Shall be assessed, by an Assessing Officer to ensure they have the correct knowledge, competence and attitude for the work to be done.

(iii) The Assessing Officer Shall recommend successful candidates to the Authorising Officer for authorisation.

(iv) A written authorisation certificate Shall be issued to each Person clearly outlining what they are authorised to do.

(v) All staff with authorisation certificates must present them for inspection upon request.

(vi) A record will be retained by the Company.

1.6 SCOPE AND APPLICATION OF THE RULES

These Rules Shall be applied to electricity generation and distribution Systems up to and including 33kV and to associated Apparatus which are being constructed, operated or worked on by the Company.

The Rules Shall not be applied to any of the following:

Lighting and power circuits covered by the IET 18th Edition Regs (BS7671)

Vehicle systems

Control and instrumentation systems

IT equipment

These systems Shall be worked on using other appropriate Rule sets.

1.7 ISSUE OF SAFETY RULES

A copy of these Safety Rules Shall be issued to such employees and other such Persons as determined by the Designated Engineer.

Each Person receiving a copy Shall sign a receipt for a copy of these Safety Rules.




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1.8 VARIATION OF SAFETY RULES

In exceptional or special circumstances these Safety Rules may be varied to such an extent as is necessary and Approved by the Designated Engineer.

1.9 SPECIAL PROCEDURES

Where situations exist where work or testing on Apparatus and Conductors to which these Safety Rules cannot be applied, or for special reasons should not be applied, it Shall be carried out in accordance with a Safety Rules Procedure. Such a procedure Shall ensure that the safety requirements of these Rules are achieved in some other way.

1.10 OBJECTIONS

When any person receives instructions regarding the operation of or work/ testing on an electrical System, he Shall report any objections on safety grounds to carrying them out to the Person issuing them, who Shall have the matter investigated and, if necessary, referred to a higher authority for a decision before proceeding.

1.11 INCIDENT REPORTING

All accidents and dangerous incidents must be reported to a Supervisor without delay. The accident/ incident will be dealt in accordance with a Safety Rules Procedure.




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SECTION 2 - DEFINITIONS

D1. APPARATUS - all equipment in which electrical Conductors are used, or supported, or of which they form a part.

D2. APPROVED - sanctioned for use by the Company Designated Engineer.

D3. ARC FLASH - an electrical breakdown of the resistance of air and/or other insulating medium resulting in an electric arc which can occur where there is sufficient voltage in an electrical System and a path to earth or adjacent phase Conductors, or lower voltage to sustain a continuous fault current. An Arc Flash will cause substantial damage, fire, explosion, or injury.

D4. ASSESSING OFFICER – a Person with appropriate knowledge, skill and competence to assess and recommend Persons to be authorised under the provisions of these Safety Rules.

D5. AUTHORISING OFFICER - an appointed officer of the Company responsible for formally authorising Persons to undertake specified duties in accordance with these Safety Rules.

D6. CIRCUIT STATE CERTIFICATE - a certificate confirming the state of a System in terms of points of isolation and earthing which have been established.

D7. COMPANY – all references to the Company refer to High and Low Voltage Engineering Ltd (HaLVE).

D8. CONDUCTOR - an electrical Conductor connected to a System.

D9. CUSTOMER LIAISON DOCUMENT - a document, used normally at the pre-work planning stage, to confirm in conjunction with the Customer:

The work to be done

Who will control the Danger – Customer’s Authorised Person or HaLVE Authorised/Senior Authorised Person.

Authorisation, where required, to operate Customer’s HV and/or LV switchgear

D10. DANGER - A risk to health, or of bodily injury.

D11. DEAD – at or about zero voltage and disconnected from any Live System.

D12. DESIGNATED ENGINEER – the engineer appointed by the Company to be responsible for the maintenance and application of these Safety Rules in order to ensure that they are in keeping with Company policy and relevant legal requirements.

D13. EARTHING

(a) EARTH - the general mass of the Earth. Electrically this can be considered to be zero volts.

(b) EARTHING DEVICE – an Approved device used for the application a Circuit Main Earth or Additional Earth

(c) EARTHED - connected to Earth by means of an earthing device.

(d) CIRCUIT MAIN EARTH - a fixed or portable earthing device applied at a position defined in a Safety Document.

(e) PORTABLE EARTH - an Approved Earth that comprises of earthing leads and clamps, applied via an Approved pole or rod, and dependent upon its rating, have the capability of being used as a Circuit Main Earth or an Additional Earth.

(f) ADDITIONAL EARTH - A fixed or portable earthing device applied after the issue of a Safety Document. For instance, an Earth applied at the point of work.




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D14. ISOLATED - disconnected from any Live System by an Isolating Device in the isolating position, or by adequate physical separation or sufficient gap. Where possible the device must be locked.

D15. ISOLATING DEVICE - a device for rendering Apparatus Isolated.

D16. ISOLATION & EARTHING REQUEST - a document used to request the creation and restoration of points of isolation and earthing where another party has operational control

D17. HIGH VOLTAGE SYSTEM DOCUMENT – a document used to confirm who has control of the Danger when work/testing is to be carried out on a defined part of HV System and the work/testing will be carried out by an appointed Contractor. The document also provides the option to temporarily authorise a Contractor’s Authorised/Senior Authorised Person to operate HV/LV switchgear associated with the proposed work.

D18. KEY SAFE - a device for the secure retention of safety keys.

D19. LIVE - electrically charged.

D20. NOTICES

a) CAUTION NOTICE - an Approved notice fixed at a point of isolation warning against interference.

b) DANGER NOTICE an Approved notice reading ‘Danger’

D21. PERSONS

(a) COMPETENT PERSON - a person recognised by the Company as having sufficient technical knowledge and/ or experience to enable him to avoid Danger and who may be nominated to receive Permits-to-Work and/ or Limited Work Certificate.

(b) AUTHORISED PERSON - a Competent Person over 18 years of age who has been appointed in writing by the Company to carry out specific duties which may include the following, as specified on their Certificate of Authorisation:

HV and LV switching, both routine and to establish points of isolation and earthing

authority to receive and clear Sanction-for-Test documents

(c) SENIOR AUTHORISED PERSON - an Authorised Person who has been appointed in writing by the Company to carry out specific duties, including the issue and cancellation of Safety Documents.

(d) DUTY SENIOR AUTHORISED PERSON – a Senior Authorised Person who assumes the role of Control Person for the duration of his/her period whilst on duty.

D22. CONTROL PERSON - a Senior Authorised Person who has been appointed by the Company to be responsible for controlling and co-ordinating safety activities necessary to achieve safety from a System, where safety measures are established on HV/LV Systems.

D23. SAFETY DOCUMENTS

a) LIMITATION-OF-ACCESS - a Safety Document of a format indicated in these Rules which can be used to define the limits within which work or testing may be carried out and specifies necessary precautions.

b) PERMIT–TO–WORK - a Safety Document of a format indicated in these Rules which can be used to specify the High Voltage Apparatus which has been made safe to work on and the work which is to be carried out.

c) SANCTION–FOR–TEST - a Safety Document of a format indicated in these Rules which can be used to specify the High Voltage Apparatus which has been made safe




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for the testing described in the Safety Document and the conditions under which the testing is to be carried out.

D24. SAFETY CO-ORDINATOR - a person responsible for co-ordinating safety activities associated with work on an HV System where work is to be carried out and identified on a Customer Liaison Document.

D25. SAFETY LOCK - a lock used to secure a point of isolation.

D26. SUPERVISION:

a) IMMEDIATE SUPERVISION - Supervision by a Person (having adequate technical knowledge, experience and competence) who is continually available at the location where work or testing is in progress and who attends the work area as is necessary for the safe performance of the work or testing.

b) PERSONAL SUPERVISION - Supervision by a Person such that the supervising Person is at all times during the course of the work or testing in the presence of the person being supervised.

D27. SUBSTATION – a room or enclosure where electrical energy is controlled or transformed at a voltage exceeding 1000 volts.

D28. SWITCHING – the operation of circuit breakers, switches, isolators, fuses or other methods of making or breaking an electrical circuit and/or the application and removal of Circuit Main Earths.

D29. SYSTEM - items of Apparatus which used separately or together in any process associated with the generation or distribution of electricity.

D30. SYSTEM CONTROLLER - a nominated individual appointed by the System owner or operator who has responsibility for co-ordinating electricity supplies on a defined System.

D31. VOLTAGES

(a) LOW VOLTAGE (LV) - 0 -1000 volts a.c. and 0 -1500 volts d.c.

(b) HIGH VOLTAGE (HV) - exceeding 1000 volts a.c. or 1500 volts d.c.

D32. WORKING PARTY – either the persons under the Immediate Supervision of a Competent or Authorised Person (who Shall himself/herself be a member of the Working Party) or a Competent or Authorised Person when working by himself/herself.




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SECTION 3 - GENERAL SAFETY PRECAUTIONS 3.1 GENERAL SAFETY RESPONSIBILITIES

3.1.1 Work undertaken in accordance with these Safety Rules will involve an aspect of general safety that requires Persons to take a level of responsibility for the control measures that are identified as being required.

3.1.2 It is the responsibility of all Persons to comply with Company general safety policy and

procedures.

3.1.3 The following three paragraphs summarises the division and allocation of responsibilities when a Safety Document is issued. The following principles Shall apply.

(i) The Person issuing the document Shall ensure that the work and work area is risk assessed in respect to general safety and recorded. This assessment Shall form part of the briefing given to the recipient when the Safety Document is issued.

(ii) The Person issuing the Safety Document Shall ensure that the recipient understands the briefing. The recipient Shall brief the Working Party members ensuring that they understand the hazards in the work area and the control measures which are in place. The recipient is responsible for ensuring that the control measures in place are adequate for the duration of the work.

(iii) Working Party members are responsible for raising any safety concerns that may arise with the document recipient during the course of the work.

3.2 PERSONAL PROTECTIVE EQUIPMENT (PPE)

3.2.1 Certain specified tasks require the use of PPE. Where the Safety Rules and Safety Rules Procedures require it, PPE Shall be worn.

3.3 SAFETY OBJECTIONS AND REPORTING

3.3.1 A Person who has a safety-based objection to an instruction must report it immediately to his supervisor.

3.3.2 No person Shall be instructed to undertake work that they are not authorised to do.

3.3.3 Any unsafe, unplanned events must be reported immediately to a supervisor.

3.4 INTERFERENCE WITH SAFETY PRECAUTIONS

3.4.1 Safety Locks, Danger and Caution Notices, barriers, earth connections and other safety devices, Shall not be altered or removed unless personally supervised by the Senior Authorised Person responsible for issuing or cancelling the associated Safety Document(s).

3.5 ACCESS TO AND WORK IN SUBSTATIONS (including Control Rooms and Switching Stations where the System voltage exceeds 1000 volts).

3.5.1 No person Shall, without proper authority, enter or have access to any operational premises such as any Substation, control room and/ or Switching station.

3.6 ACCESS TO HIGH RISK WORK AREAS

3.6.1 Underground Chambers and Confined Spaces

(i) The Company Shall produce method statements for access, egress and work in those areas that are identified as a Confined Space.




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(ii) All Persons who need to enter areas that have been defined as a Confined Space Shall comply with the method statement for that area.

3.7 FIRE PROTECTED AREAS

3.7.1 Automatic control must be rendered inoperative in accordance with a Safety Rules Procedure and a Caution Notice affixed and Shall where practicable be locked with a Safety Lock.

3.7.2 If the system is designed for safe operation during occupancy of the area, then isolation is not required. However, when a Safety Document is issued for work in such an area it Shall be recorded on the document that the system is ‘active’, detailing any necessary precautions.

3.8 SWITCHING ON HIGH VOLTAGE SYSTEMS

3.8.1 All High Voltage Switching operations, other than emergency ones, Shall require the sanction of the Control Person.

3.8.2 Only an Authorised Person, or a Competent Person under their Personal Supervision, Shall operate High Voltage Apparatus.

3.8.3 Where High Voltage Switching operations can be carried out from a location remote from the Switching device, then this Shall be carried out by an Authorised Person.

3.8.4 The Authorised Person Shall, where practicable, complete the Switching operations in accordance with an approved Switching schedule.

3.8.5 A Switching schedule to be approved for use Shall be produced by a Senior Authorised Person. Where the number of points of isolation which will be entered on a safety document associated with the work/testing exceeds three, the switching schedule Shall be approved and countersigned by another Senior Authorised Person.

3.8.6 When it is not practicable to use an approved Switching schedule and Switching instructions have to be issued by telephone or radio the following procedure Shall be adopted to ensure that a Switching schedule is produced in a controlled manner:

(i) The Control Person Shall read out the instruction.

(ii) The Authorised Person Shall write it down on a Switching schedule.

(iii) The Authorised Person Shall read the instruction back to the Control Person.

(iv) The Control Person Shall confirm the instruction has been repeated correctly.

(v) The Authorised Person Shall carry out the Switching, with the Switching schedule in his possession and in accordance with its detail.

(vi) The Authorised Person Shall record the time of the operation on the schedule and sign to signify that the operation has been completed.

(vii) The Authorised Person Shall immediately contact the Control Person informing him of the time of the completed operation.

3.8.7 Prior to carrying out a Switching operation the Authorised Person Shall check that he/she is at the correct location, has identified the correct switch to be operated and that switch is in the expected operational position.

3.8.8 The Authorised Person prior to carry out the switching operation Shall also ensure that suitable PPE is worn in accordance with the Company’s PPE policy and its suitability determined as part of pre-work Risk Assessment process. This requirement Shall extend to any other persons who may in attendance to assist with the intended switching operations.

3.8.9 Once the Authorised Person has confirmed the factors listed in 3.8.6 he/she Shall carry out the operation without undue delay.




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3.8.10 When Apparatus shows signs of distress all persons Shall immediately leave the

Substation and inform the Control Person who will assess the situation.

3.8.11 Switching using time delays or pre-arranged signals is forbidden.




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SECTION 4 - SAFETY PRECAUTIONS FOR WORK ON OR NEAR HIGH VOLTAGE SYSTEMS 4.1 GENERAL REQUIREMENTS

4.1.1 Work Shall only commence on a High Voltage System when the following precautions are in place.

(i) Dead.

(ii) Isolated from all sources of energy, all practicable steps taken to lock off from all points of supply and Caution Notices fixed at all points of Isolation.

(iii) Earthed by Approved means against all sources of High Voltage supply.

(iv) Screened where necessary to prevent Danger.

(v) Positively identified at the point of work by Approved means.

(vi) Released for work by the issue of an appropriate Safety Document to the Person who is to be responsible for completing the work. This Person Shall be fully conversant with the precise part of the System to be worked on, the nature and extent of the work to be done and the safety precautions to be taken.

Guidance on the Application of Safety Rule 4.1

Making HV Apparatus safe to work on or test, requires creating points of isolation to isolate all energy sources which could give rise to Danger by means of a suitable Isolating Device(s).

Isolating Devices should be locked with a Safety Lock and a Caution Notice attached.

Circuit Main Earths must be applied at each point of HV isolation and if possible locked in the ‘ON’ position

The Apparatus to be worked on or tested must be positively identified and proved Dead by Approved means at the point of work before the Safety Document is issued.

Where proving Dead cannot be carried out until access is gained to HV Conductors, e.g. BusBar chambers, then the Senior Authorised Person must personally supervise the removal of covers or access plates in order the carry out the testing. In such circumstances the Senior Authorised Person must verify that the Apparatus is fully Isolated and Earthed, prior to the removal of covers, which will be done after the Safety Document is issued.




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4.2 SAFETY PRECAUTIONS AND PROCEDURES FOR WORK ON PARTICULAR ITEMS OF HIGH VOLTAGE APPARATUS AND CONDUCTORS

4.2.1 In addition to the specific requirements of Rule 4.1 and the Safety Rules in general, work or testing on High Voltage Apparatus and Conductors Shall be carried out in accordance with the appropriate Safety Rules Procedures for the type of High Voltage Apparatus on which work or testing is to be done.

4.2.2 The appropriate Safety Rules Procedure will specify all additional safety precautions, which must be applied prior to work or testing commencing and also those required during the course of the work or testing.

Guidance

on the

Application

of Safety

Rule 4.2

In addition to the requirements of Safety Rule 4.1.1, reference must be made to the Safety Rules Procedure applicable to the type of Apparatus to be worked on or tested, e.g. HV Cable, HV transformer, HV switchgear, etc. The Safety Rules Procedure will specify the additional procedures to be applied in order that the work or testing is carried out safely. A summary list of Safety Rules Procedures is listed below.

List of Safety Rules Procedures forming part of these Safety Rules

Safety Rules Procedure No.

Description

SRP1 HV Switching

SRP2 Earthing of High Voltage Equipment

SRP3 Work on High Voltage Metalclad Switchgear

SRP4 Work on High Voltage Cables

SRP5 Work on Transformers

SRP6 Access to Operational Areas

SRP7 Testing HV Apparatus

SRP8 Areas with Automatic Fire Suppression Systems

SRP9 Work on or Testing on Customers’ HV and LV Systems

SRP10 Procedures when normal Safety Document and Key Procedures cannot be complied with

SRP11 Excavations and Safe Digging

SRP12 Authorisation Procedures




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4.3 ISOLATION OF APPARATUS AND CONDUCTORS

4.3.1 No isolation or re-connection of High Voltage Apparatus or Conductors Shall be carried out without the sanction of the Control Person.

4.3.2 Safety Locks Shall be used to lock open, where practicable, Isolating Devices. When the Apparatus or Conductors on which work is to be carried out is controlled only

by fuses or links, the fuses, links (and carriers) Shall be removed and kept in a safe place

which may be the personal retention of the Senior Authorised Person.


All switching operations to isolate or re-energise Apparatus must be sanctioned by the Control Person. This in practice will be sanctioned by the Duty Senior Authorised Person acting as Control Person.

Points of Isolation must be locked off, where practical with Safety Locks. Safety Lock keys must be placed in a Key Safe.

Where fuses or links and carriers are removed to create the point of isolation, these must be kept in a safe place, or held by the Senior Authorised Person who will issue the Safety Document.

4.4 EARTHING

4.4.1 When High Voltage Apparatus and Conductors are to be discharged and Earthed in accordance with Rule 4.1.1 (iii) it Shall be done in accordance with one of the following:

(i) Where reasonably practicable, by the use of a circuit breaker or earthing switch provided for the purpose of making the earthing connection. When a circuit breaker is used the trip feature Shall be rendered inoperative prior to closing. The circuit breaker or switch Shall be locked in the Earthed position whilst it is the Circuit Main Earth.

(ii) Where (i) is not reasonably practicable or not applicable, the High Voltage Apparatus and/or Conductors Shall be checked by means of an Approved voltage testing device or other Approved means to verify that they are not Live. A Circuit Main Earth of the Portable Earth type Shall then be applied using an Approved earthing pole or other Approved appliance.


Circuit Main Earths can only be applied once all points of isolation have been established.

The use of a fully rated Fault Making Circuit Breaker or Earth Switch for the application of Circuit Main Earths to HV Systems should be the first choice. If it is possible to test to prove the HV circuit is Dead, e.g. in the case of withdrawable type circuit breakers, this can be done. However, it is not a mandatory requirement provided the Earthing Device is a fully rated Fault Making device, i.e. it is designed and capable of being closed on to a Live circuit and can carry the resultant fault energy without failure, if the circuit were to be inadvertently still Live.

If a Circuit Breaker is used to apply the Circuit Main Earth then the tripping must be made inoperative to prevent it tripping if the circuit were to be still Live, before the Circuit Main Earth is applied.




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If the Circuit Main Earth is being applied by a non-fault making or portable Earthing Device then the circuit must be proved Dead by the use of an Approved voltage tester, before the Circuit Main Earth is applied.

4.4.2 Circuit Main Earths

The application of Circuit Main Earths by the closing of an earth switch, circuit breaker to the Earth ‘ON’ position or the application of a Portable Earth, Shall be only done on the instruction of a Control Person


Circuit Main Earths can only applied on the instruction of the Control Person. In practice this will be the Duty Senior Authorised Person.

Prior to the application of Circuit Main Earths the Control Person will check to ensure that all points of isolation have been carried out and it is safe to apply Circuit Main Earths.

4.4.3 Portable Earths - Leads and Connections

(i) Portable Earth leads and associated clamps Shall be of an Approved type and of adequate capacity for the earthing duty they are required to perform.

(ii) They Shall be adequately maintained and inspected immediately prior to use.

(iii) A Portable Earth of the Additional Earth type Shall not be used as a Circuit Main Earth.


The use of Portable Earths should only be used if it is not possible to apply a Circuit Main Earth via a fixed Earthing Device, i.e. a Circuit Breaker or Earth Switch.

Portable Earths used for providing a Circuit Main Earth must of an Approved type and fully rated for its intended duty, i.e. it is capable of carrying the maximum value of fault energy which could flow for a minimum period of 3 seconds.

4.4.4 Procedures for the use of Portable Earths – Circuit Main Earth type

(i) The circuit Shall be verified as not Live, and where practicable checked by means of an Approved voltage testing device or other Approved means.

(ii) A Circuit Main Earth Shall be connected to Earth before being connected to the phase Conductors. Connection to the phase Conductors Shall be done using an Approved earthing pole or rod or other Approved device.

(iii) All phases Shall be Earthed, even if work is to be carried out on one phase only.

(iv) A Circuit Main Earth Shall not be applied in any cell or compartment in which there is any exposed metal Live at High Voltage which may be a source of Danger.

(v) Circuit Main Earths Shall, where practicable, be applied in such a way that they remain clearly visible.

(vi) When a Circuit Main Earth is to be removed, all leads Shall be disconnected from the phase Conductors by means of an Approved earthing pole or rod or other Approved device before disconnecting the Earth connection.




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(vii) Conductors within metal-clad switchgear spouts Shall only be Earthed using an Approved device. The insertion of the hand or any tool for this purpose is forbidden.

4.4.5 Additional Earths

(i) Additional Earths are applied after the issue of a Permit-to-Work or Sanction-for-Test and can be applied and removed by a Competent Person.

(ii) The number of Additional Earths permitted for use Shall be recorded on the Safety Document.

(iii) Additional Earths, Shall, where practicable, be applied in such a way that they remain clearly visible.

4.5 PERMITS-TO-WORK

4.5.1 Authority to Issue

(i) A Permit-to-Work Shall be issued by a Senior Authorised Person before any work is carried out on any High Voltage Apparatus or Conductor.

(ii) A Permit-to-Work Shall only be issued with the authority of the Control Person who Shall ensure that a written record of the issue and cancellation of all the Safety Documents sanctioned are retained.

4.5.2 Procedure for Issue and Receipt

(i) A Permit-to-Work Shall be explained and issued to the Competent Person responsible for the work to be undertaken, who after reading its contents and confirming that they understand it and is conversant with the nature and extent of the work to be done, Shall sign the 'Receipt' section and its duplicate copy.

(ii) The Recipient of the Permit-to-Work Shall retain the Safety Document in his possession at all times whilst the work is being carried out.

(iii) Where more than one Working Party is involved a Permit-to-Work Shall be issued to the Competent Person in charge of each Working Party and these where necessary, Shall be cross-referenced one with another.

PTW Issue & Receipt procedure




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4.5.3 Suspension of a Permit-to-Work

(i) If required by a Senior Authorised Person, a Permit-To-Work may be suspended by the recipient and surrendered to a Senior Authorised Person who Shall retain the Safety Document together with any Key Safe Key and other relevant items in safe custody until it is re-issued back to the recipient by a Senior Authorised Person.

(ii) When a Permit-To-Work is to be suspended, the recipient Shall sign the Suspension section of the Suspension Record, timing and dating it in the presence of a Senior Authorised Person and Shall surrender or account for all items issued with the Safety Document. The recipient Shall inform the Senior Authorised Person of the state of the work or testing and the state and condition of the Apparatus at the time of the suspension.

(iii) The Senior Authorised Person accepting the Permit-To-Work in to safe custody should be fully conversant with the Permit-To-Work, the work or testing being carried out and the state and condition of the Apparatus. It is his responsibility to ensure that the Safety Document is retained in safe custody prior to its reissue back to the recipient.

(iv) The re-issue of a suspended Permit-To-Work Shall be carried out by a Senior Authorised Person at the location of the work. The recipient and the re-issuing Senior Authorised Person Shall both discharge their responsibilities as if the Permit-to-Work was being issued for the first time. The Senior Authorised Person Shall sign the Re-Issue section of the Suspension Record, timing and dating it, in the presence of the recipient, confirming that the safety precautions detailed on the Permit-to-Work are all in place. The recipient Shall then sign the receipt section of the Suspension Record, timing and dating it.

(v) A suspended Permit-to-Work cannot be re-issued if a Sanction-for-Test is in force for the same Apparatus, or within the same Isolated System.

PTW Suspension procedure




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Re-Issue Suspended PTW procedure




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4.5.4 Procedure for Clearance and Cancellation

(i) A Permit-to-Work Shall be cleared and cancelled:

(a) When work for which it was issued has been completed.

(b) When a Senior Authorised Person decides to interrupt or suspend the work detailed on the Permit-to-Work, and the normal ‘Suspension’ procedure to enable the issue of a Sanction-for-Test, is not appropriate.

(ii) The recipient Shall sign the 'Clearance' section’, indicating whether the work is complete or incomplete, and return the Permit-to-Work to a Senior Authorised Person who Shall cancel it by completing the 'Cancellation' section.

PTW Clearance and Cancellation

4.6 SANCTIONS-FOR-TEST


(i) A Sanction-for-Test Shall be issued by the Senior Authorised, or an Authorised Person specially authorised to do so, responsible for initiating the testing before any testing is carried out on any High Voltage Apparatus or Conductor.

(ii) A Sanction-for-Test Shall only be issued with the authority of a Control Person who Shall ensure that a written record of the issue and cancellation of all the Safety Documents the sanction is retained.

4.6.2 Procedure for Issue and Receipt

(i) A Sanction-for-Test Shall be explained and issued to the Authorised Person who is responsible for the testing. The recipient Shall, after reading its contents and confirming that he understands it and is conversant with the nature and extent of the testing to be done, sign the 'Receipt' section and its duplicate copy.

(ii) The recipient of the Sanction-for-Test Shall retain the Safety Document in his possession at all times whilst the testing is being carried out.

4.6.3 Suspension of a Sanction-for-Test

(i) If required by a Senior Authorised Person, a Sanction-for-Test may be suspended by the recipient and surrendered to a Senior Authorised Person who Shall retain the Safety Document together with any Key Safe Key and other relevant items in safe custody until it is re-issued back to the recipient by a Senior Authorised Person.

(ii) When a Sanction-for-Test is to be suspended, the recipient Shall sign the Suspension section of the Suspension Record, timing and dating it in the presence of a Senior Authorised Person and Shall surrender or account for all items issued with the Safety




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Document. The recipient Shall inform the Senior Authorised Person of the state of the testing and the state and condition of the Apparatus at the time of the suspension.

(iii) The Senior Authorised Person accepting the Sanction-for-Test in to safe custody should be fully conversant with the Sanction-for-Test, the testing being carried out and the state and condition of the Apparatus. It is his responsibility to ensure that the Safety Document is retained in safe custody prior to its reissue back to the recipient.

(iv) The re-issue of a suspended Sanction-for-Test Shall be carried out by a Senior Authorised Person at the location of the work. The recipient and the re-issuing Senior Authorised Person Shall both discharge their responsibilities as if the Sanction-for-Test was being issued for the first time. The Senior Authorised Person Shall sign the Re-Issue section of the Suspension Record, timing and dating it, in the presence of the recipient, confirming that the safety precautions detailed on the Permit-to-Work are all in place. The recipient Shall then sign the receipt section of the Suspension Record, timing and dating it.

(v) A suspended Sanction-for-Test cannot be re-issued if a Permit-to-Work is in force for the same Apparatus, or within the same Isolated System.


(i) When testing on Apparatus for which a Sanction-for-Test has been issued is completed the recipient Shall sign the 'Clearance' section and return the Sanction-to-Test to a Senior Authorised Person who Shall cancel it by completing the 'Cancellation' section.

(ii) The Senior Authorised Person Shall inform the Control Person that the document has been cancelled.

4.7 LIMITATION-OF-ACCESS


(i) A Limited Work Certificate Shall be issued by a Senior Authorised Person or an Authorised Person specially authorised to do so, when it is considered necessary to have written instructions to avoid Danger and when a Permit-to-Work or a Sanction-for-Test is not applicable.

(ii) A Limitation-of-Access Shall be issued for the following types of activity where there is Danger:

(a) Access to and work in a confined space, e.g. underground chambers.

(b) Work requiring breathing apparatus.

(c) Work on withdrawable High Voltage Apparatus in its withdrawn position when the work/testing is to be done within the confines of the switchroom or Substation.

(d) Work on Apparatus operated by or containing compressed air or other gasses.

(e) Other work or testing activities as specified by the Designated Engineer. 4.8.2 Procedure for Issue and Receipt

(i) A Limitation-of-Access Shall be explained and issued to a Competent Person who is responsible for the work/ testing to be carried out, who after reading its contents and confirming that he understands it and is conversant with the nature and extent of the work or testing to be done, Shall sign the 'Receipt' section and its duplicate copy.




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(ii) The recipient of the Limited Work Certificate Shall be a Competent Person who Shall retain the Safety Document in his/her possession at all times whilst the work is being carried out.

4.8.3 Suspension of a Limitation-of-Access

(i) If required by a Senior Authorised Person, a Limitation-of-Access may be suspended by the recipient and surrendered to a Senior Authorised Person who Shall retain the Safety Document together with any Key Safe Key and other relevant items in safe custody until it is re-issued back to the recipient by a Senior Authorised Person.

(ii) When a Limitation-of-Access is to be suspended, the recipient Shall sign the Suspension section of the Suspension Record, timing and dating it in the presence of a Senior Authorised Person and Shall surrender or account for all items issued with the Safety Document. The recipient Shall inform the Senior Authorised Person of the state of the testing and the state and condition of the Apparatus at the time of the suspension.

(iii) The Senior Authorised Person accepting the Limitation-of-Access in to safe custody should be fully conversant with the Sanction-for-Test, the testing being carried out and the state and condition of the Apparatus. It is his responsibility to ensure that the Safety Document is retained in safe custody prior to its reissue back to the recipient.

(iv) The re-issue of a suspended Limitation-of-Access Shall be carried out by a Senior Authorised Person at the location of the work. The recipient and the re-issuing Senior Authorised Person Shall both discharge their responsibilities as if the Limited Work Certificate was being issued for the first time. The Senior Authorised Person Shall sign the Re-Issue section of the Suspension Record, timing and dating it, in the presence of the recipient, confirming that the safety precautions detailed on the Limitation-of-Access are all in place. The recipient Shall then sign the receipt section of the Suspension Record, timing and dating it.


A Limitation-of-Access Shall be cleared by the recipient by signing the 'Clearance' section and then returning it to the Person who issued it, who Shall cancel it by completing the 'Cancellation' section.




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SECTION 5 - RESPONSIBILITIES OF PERSONS 5.1 GENERAL

5.1.1 It is the duty of all Persons who may be concerned with the control, operation, work or testing, on or in the near vicinity of Apparatus to which these Safety Rules apply, to implement the Safety Rules and to comply with them and the related Safety Rules Procedures. Ignorance of the relevant legal requirements, Safety Rules, and Safety Rules Procedures Shall not be accepted as an excuse for neglect of duty.

5.1.2 The responsibilities placed upon Persons may include all or part of those detailed in this

section, depending on the role of the Persons. 5.1.3 Any written authorisation given to Persons to perform their designated role in implementing

the Safety Rules Shall indicate the class of operation and/or work permitted and the section of the System to which the authorisation applies.

5.1.4 Persons involved in achieving safety from the inherent Dangers of the System to allow

work or testing to commence on Apparatus and its subsequent restoration to service, will be concerned in the following three broadly separate identifiable areas

(i) 'Control' - including (before work commences) instructing actions to implement safety precautions and sanctioning the issue of Safety Documents and (after completion of work) acknowledging the cancellation of Safety Documents and instructing actions to restore Apparatus to service.

(ii) 'Making safe or restoration of Apparatus' - including (before work commences) taking action to make Apparatus safe for work and issuing Safety Documents and (after completion of the work) cancelling Safety Documents and taking action to restore Apparatus to service.

(iii) 'Work' - which includes receipt of a Safety Document, execution of the required work to its completion or termination and clearance of the Safety Document.

5.2 COMPETENT PERSONS

5.2.1 The responsibilities of Competent Persons include those specified below. Competent Persons must ensure that their responsibilities are implemented.

5.2.2 Competent Persons Shall comply with these Safety Rules when carrying out work whether instructions are issued orally or in writing.

5.2.3 Competent Persons Shall use safe methods of work, safe means of access and egress to and from the work position and the personal protective equipment and clothing issued for their safety.

5.2.4 Competent Persons when responsible for the Supervision of a Working Party Shall comply with the following.

(i) Be fully conversant with the nature and extent of the work to be done.

(ii) Read the Safety Document and confirm to the Person issuing it that they fully understand its contents.

(iii) During the course of the work, adhere to, and instruct others under their charge to adhere to, any conditions, instructions or limits specified on any Safety Document.

(iv) Retain any Safety Document and (where appropriate) keys in safe custody and correctly implement any Company procedure to achieve this.

(v) Provide Immediate Supervision or Personal Supervision as required.




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(vi) Warn all persons as quickly as possible to withdraw from, and not work on the Apparatus concerned until further notice, if during the course of work a hazard which could result in Danger arises or is suspected. The situation Shall be reported immediately by the Competent Person to a Senior Authorised Person or Control Person.

5.2.5 Competent Persons Shall not start or restart work under a Safety Document issued to another Competent Person without the permission of that Competent Person.

5.2.6 Competent Persons clearing a Safety Document Shall do so only after all persons working under the Safety Document have been withdrawn from, and warned not to work on, the Apparatus concerned. Where appropriate, they Shall ensure that all tools, gear and loose material have been removed, guards and access doors replaced and the workplace left tidy. Where appropriate, they Shall return, or account for, those items issued with the Safety Document.

5.3 AUTHORISED PERSONS

5.3.1 In addition to the responsibilities as Competent Persons, Authorised Persons Shall have some or all of the following responsibilities within the limits imposed by their Certificates of Authorisation.

5.3.2 When participating in achieving safety from the inherent Dangers of the System, Authorised Persons Shall correctly implement specified procedures before work commences, including the following:

(i) The keeping of a proper written record of all messages, passed by telephone or otherwise relating to the operation of the High Voltage System.

(ii) The repeating in full to the sender of every message relating to the operation of the High Voltage System.

(iii) Carrying out operations instructed by a Control Person without undue delay, the implementation of the instructions to be reported back to the Control Person as soon as possible after completion.

5.3.3 As the recipient of a Sanction-for-Test

(i) Meeting the particular requirements of Safety Rules Procedure 7 - 'Testing of High Voltage Apparatus’.

(ii) Being present during the testing, being responsible for co-ordinating all testing operations on the Isolated Apparatus and for ensuring safety during tests. Such tests may include making Live the Apparatus from a testing supply.

(iii) Carrying out the temporary removal, and then the re-application of Circuit Main Earths as required for testing without further reference to the Control Person or the Senior Authorised Person who issued the document.

5.3.4 Authorised Persons are not permitted to assume the role of Control Person.




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5.4 SENIOR AUTHORISED PERSONS

5.4.1 In addition to the responsibilities as an Authorised Person, Senior Authorised Persons Shall have some or all of the following responsibilities.

5.4.2 Correctly implementing Safety Rules Procedures to ensure that all precautions are completed, including the following

(i) Confirming through the Control Person that safety precautions at all locations are complete.

(ii) Meeting the requirements of all relevant sections of these Rules.

(iii) Prior to the issue of a Safety Document, deciding where appropriate:

(a) Whether Additional Earths are required, and if so, the number and points of application.

(b) Whether any action is required to contain or dissipate stored energy.

(c) Whether additional precautions are necessary.

(d) Whether Personal Supervision is required, and

also ensuring that:

(e) Safety from the inherent Dangers of the System has been achieved and Shall be maintained when the requirements of the Safety Document are completely implemented.

(f) The contents of the Safety Document to be issued are correct and unambiguous.

(g) The authority of the Control Person has been obtained for the issue of a Safety Document.

5.4.3 When issuing a Safety Document

(i) Fully explaining the contents of the Safety Document to the recipient and ensuring that he understands the nature and extent of the work or testing to be done, and the safety precautions to be taken.

(ii) Noting the number Additional Earths are available for use and recording this on the Safety Document.

(iii) Issue the Safety Document together with (as appropriate) any keys, Method Statements, etc.

5.4.4 When cancelling a Safety Document

(i) Ensuring that the requirements of the clearance section have been completed correctly.

(ii) Checking that all items issued with the Safety Document have been returned or accounted for.

(iii) Checking the operational state of Apparatus.

(iv) Informing the Control Person of the cancellation of the Safety Document and confirming the state of the Apparatus.

5.4.5 Some Senior Authorised Persons Shall have their authorisation certificate endorsed for

them to take on the responsibilities of a Control Person.




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5.5 CONTROL PERSON

5.5.1 A Senior Authorised Persons may have his responsibilities extended to embody those of Control Person.

5.5.2 The primary role of the Control Person is to take operational control of the System or a designated part of the System to be operated and/ or worked on.

5.5.3 The role of Control Person is enacted by one Person only. The sharing of Control Person responsibilities is forbidden.

5.5.4 The responsibilities of a Control Person include the following:

(i) Giving authority for the release of Apparatus from service following consultation with the System Controller.

(ii) Giving authority for all High Voltage Switching except in cases of emergency or in other Approved cases.

(iii) Communicating directly with the Authorised Person who is to carry out the Switching.

(iv) Consulting with Control Engineers or Control Persons of other Systems to agree and initiate Switching where there is inter-connection across boundaries; also agreeing responsibility for the control of circuits in the Isolated state preparatory to sanctioning the issue of Safety Documents.

(v) Before giving authority for the issue of a Safety Document, ensuring that the necessary operations to obtain safety from the inherent Dangers in the System are carried out.

(vi) Giving authority for the issue, acknowledging cancellation of, Permits-to-Work and Sanctions-for-Test.




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Appendix 1 – Permit-to-Work format – front




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Appendix 1 – Permit-to-Work format – back




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Appendix 2 – Sanction-for-Test format - front




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Appendix 2 – Sanction-for-Test format – back




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Appendix 3 – Limitation-Of-Access format - front




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Appendix 3 – Limitation-Of-Access format - back




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Procedure No.: SAFETY RULES PROCEDURE No. 1

Procedure Title: High Voltage Switching

Status: Final Approved By:

Date of First Issue: January 2019 Current Version: Version 1

Contents Page 1. Purpose ......................................................................................................... 40 2. Scope ............................................................................................................ 40 3. Identification .................................................................................................. 40 4. Responsibilities .............................................................................................. 40 5. Definitions ...................................................................................................... 40 6. Preparation for Switching ............................................................................... 40 7. HV Switching ................................................................................................. 41 8. Principles for safe operation of High Voltage Switchgear ............................... 42 9. HV Switching – Emergency conditions ........................................................... 42 10. Summary of general principles for High Voltage Switching ........................... 43 APPENDIX 1A – Application of locks and safety signs to switchgear .................... 44




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SRP1 – HIGH VOLTAGE SWITCHING 1. PURPOSE

To ensure that all High Voltage Switching operations are completed safely, with correct equipment and PPE and is in accordance with the HaLVE HV Electrical Safety Rules and relevant legislation.

2. SCOPE

• All High Voltage Switching

• All people engaged to carry out High Voltage Switching operations on behalf of HaLVE. 3. IDENTIFICATION

Apparatus on which work or testing is to be carried out must be readily identifiable or have fixed to it a means of identification which will remain effective throughout the course of the work or testing.

4. RESPONSIBILITIES

All people who carry out High Voltage Switching operations have a duty to comply with this instruction

5. DEFINITIONS

Terms printed in bold type are as defined in Section 2 of the HaLVE HV Electrical Safety Rules.

6. PREPARATION FOR SWITCHING

6.1 Switching instructions must be recorded giving the name of the location(s) at which the Switching is to be carried out, the identification and nomenclature of the Apparatus involved and the effect of the operation.

6.2 The sequence of instructions must be such that all the Switching causing the Apparatus to be Isolated from all points of supply, including voltage and auxiliary transformers and common neutral earthing equipment from which the Apparatus may become Live, is confirmed before any earthing instructions are issued.

6.3 HV Switching instructions must be given directly to the Person who is about to carry out the operation. Where the Switching is to be carried out by a Person under training, he must be under the Personal Supervision of an Authorised Person who has also received the Switching instruction directly. If the Person has any objections or queries at any stage of the instruction or operation, he should raise them immediately, Switching on the Apparatus must stop until the queries or objections are resolved. The instructions must be given in two parts as detailed below.

6.4 An explanation of the purpose of the subsequent operations including the identity and location of the Apparatus involved is given to the Person who is about to carry out the instructions and to any supervising Authorised Person. It is not necessary to record this part of the instruction.

6.5 The formal precise instructions should follow a standard pattern and include:

(a) The name of the Person giving the instructions

(b) The location at which the Apparatus operates

(c) The actual operational requirement




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(d) The time and date of the instruction

6.6 The Authorised Person receiving the Switching instructions should write the instruction down, including his name, using a switching schedule, repeating the instruction back phrase by phrase as received. At the end of the message the instruction must be read back in full.

7. HIGH VOLTAGE SWITCHING – other than for Emergency or agreed routine purposes

7.1 When carrying out the Switching instructions, the Authorised Person should observe the following requirements:

a) He/she should be deliberate, neither rushing nor causing undue delay and should take nothing for granted

b) He/she should take with him the written instruction, consulting it and checking that he is on the correct Apparatus and, where appropriate the operational category of the switchgear, before taking any action

c) He/she should then pause and re-check his proposed action before carrying it out

d) After carrying out each operation he/she should record that operation and check by all means readily available that it has been satisfactorily completed

e) When a switch or similar piece of Apparatus shows any sign of distress, its condition should be reported immediately before continuing with the Switching instructions. All persons must be kept clear of that Apparatus

f) A switch should only be un-locked immediately before being operated and be Locked in position immediately after it has been operated

g) The Authorised Person should endorse his Switching instruction with the time of the completion of the operation or sequence of operations

7.2 Following HV Switching the Authorised Person should comply with the following

requirements:

a) Record the time of completion of operation, together with any circuit identification

b) Report to the Control Person the operations carried out, the time of completion and any circuit identification involved, without undue delay

7.3 Where isolation is affected by the opening of Isolating Devices, the integrity of which is

dependent on the presence of a gas at the design pressure, the pressure of the gas should be monitored throughout the period of the work by the Safety Document Recipient to ensure that the integrity of the isolation is maintained. Any significant change in gas pressure should immediately be reported to the appropriate manager and all Persons immediately leave the substation.

7.4 All recorded entries should be written legibly and indelibly and the records, with copies of switching instructions, retained in accordance with the appropriate management instructions.

7.5 Before returning to service any HV switchgear that has been worked on, the Competent Person must confirm with the Senior Authorised Person cancelling the Safety Document, the operational state of the switchgear.




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8. PRINCIPLES FOR THE SAFE OPERATION OF HIGH VOLTAGE SWITCHGEAR

8.1 It is important that full attention is paid to every operation. From entering the switchroom/substation onwards, a loss of concentration or poor working practices can lead to fatal consequences.

8.2 The following outlines the steps to be taken when switchgear of any description is to be operated: -

(i) On entry use all the senses and check the following:

• Are there any unusual smells?

• Are there any unusual noises? (Switchgear is normally silent except when being operated)

• Are there any sensations of heat? (Switchgear runs cold except when under extreme duress)

• Is there any visual sign of distress? (Quantities of oil on the floor, distortions of sheet metalwork, loss of gas pressure, etc.)

• If SF6 switchgear – is the indicated gas pressure satisfactory?

(ii) Only carry out the required operation when you are totally satisfied with the condition of the Apparatus. If you have any doubts - DO NOT OPERATE!

(iii) Be deliberate; neither rush nor cause undue delay - TAKE NOTHING FOR GRANTED!

(iv) Use the written schedule to consult and make certain you have the correct switchroom/substation, the correct operation and the correct switchgear (name and capability).

(v) Pause and check again before operating.

(vi) Confirm that each item on the Switching schedule has been completed satisfactorily before progressing to the next item.

(vii) Only remove those locks which are essential for you to carry out the operation. Replace them as soon as practicable.

8.3 Complete the relevant part of the Switching schedule and report back to the Person who requested the operation as soon as possible.

9. HIGH VOLTAGE SWITCHING - Emergency Conditions

9.1 Where HV Switching has taken place under emergency conditions and without instruction from the Control Person, the Authorised Person should inform the Control Person as soon as possible after the operation. All relevant details should be recorded.

9.2 When a switch opens under fault conditions, an Authorised Person should cancel the audible alarms and report to the Control Person the details of annunciations and any relay indications available. These details should be recorded. If any relay indications are not available within the local control room, the Authorised Person should report this to the Control Person who will decide when these indications are to be obtained. The annunciator display and relay indications should be recorded before resetting the relays.

9.3 When the Control Person gives instructions to restore a circuit that has opened under fault conditions, the Authorised Person receiving the instruction should ensure that the trip relays requiring manual resetting are reset before attempting to operate any circuit-breaker.

9.4 When Apparatus in its normal operating mode is showing signs of distress it must not be operated, and all persons must immediately leave the substation. HV Switching must be




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affected as soon as possible such that the Apparatus concerned will be removed from service without it being subjected to further operations.

10. SUMMARY OF GENERAL PRINCIPLES FOR HIGH VOLTAGE SWITCHING

10.1 All Switching, except for emergencies, must be carried out to the instructions of the appropriate Control Person.

10.2 Before issuing Switching instructions, the Control Person must consult with the Control Person of any adjacent System which may be affected by the Switching.

10.3 Before instructions are issued, the location of the intended Switching, identification and description of the Apparatus and the effect of the operation must be recorded.

10.4 It is essential that all Apparatus within the working zone is completely Isolated before any earths are applied.

10.5 Switching can be carried out under both written or verbal instructions. These instructions must be given directly to the Authorised Person who is about to carry out the operation.

10.6 Where the Switching is to be carried out by a person under training, that person must be under the supervision of an Authorised Person who has received the Switching instructions.

10.7 If the Person receiving the instructions has any doubts about the operation he MUST stop until the query is clarified.




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APPENDIX 1A – APPLICATION OF LOCKS AND SAFETY SIGNS SWITCHGEAR 1. Purpose

To provide guidance on the application of locks and notices to High Voltage switchgear and associated Apparatus in both the ‘static’ situation and ‘working’ situation to prevent unauthorised operation.

2. Scope

This procedure covers all of the following.

• The general principles of locking switchgear in the ‘Static’ and ‘Working’ situation

• The preparation of Switching schedules

• The general principles of operating switchgear

3. Contents

3.1 Locking of electrical Apparatus

3.2 Locks and locking accessories

3.3 Locking of HV Apparatus in the static situation

3.4 Locking of HV Apparatus in the working situation

3.5 Locking of particular items of switchgear

3.6 General principles for safe Switching




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APPENDIX 1A – Locking and labelling of switchgear

Introductory Comment Although primarily intended for HV Systems - some of the following applies equally to LV Systems, e.g. locking of isolators to prevent Apparatus becoming Live. 3.1 LOCKING OF ELECTRICAL APPARATUS Objectives of a Locking Policy are as follows:

(i) The safety of personnel

(ii) To comply with Statutory Regulations

(iii) To enhance the security of supply

Statutory Regulations Electricity at Work Regulations: (i) Regulation 7: Recommends that conductor be placed …. 'within a secure enclosure'... For

example, unused busbar and circuit shutters of circuit breaker type switchgear.

(ii) Regulation 13: Recommends.... 'a means of locking off an isolator can be used'... For example, points of isolation.

(iii) Regulation 12: States.... 'suitable means Safety Documents be available for cutting off the

supply'... and further recommends that the devices be suitably located with easy access. For example, a switch controlling consumers transformer or switch controlling transformer in indoor substation to be unlocked

. Why lock Switchgear?

Switchgear is Locked for the following reasons:

(a) Making Live a circuit on which persons are working

(b) Accidental / unauthorised interference

(c) Access to exposed HV conductor

(d) Incorrect operations

(e) Operation of Earthing Devices onto a Live Systems




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3.2 LOCKS AND LOCKING ACCESSORIES

(i) Standard Lock: A lock which is one of a series having a common key.

(ii) Unique Lock (plain): A lock provided with one key only and having no common key. The key of the lock being denoted by a white tag with black lettering. On one side of the tag is the name of the substation at which the lock is positioned and the other side of the tag denotes for which particular device the lock is used.

(iii) Unique Lock (Red): A lock provided with only one key and having no common key. The key of the lock being denoted by a red tag with white writing. On one side of the tag is the name of the substation where the lock is positioned and on the other side of the tag is the name of the device to which the lock is attached.

(iv) Safety Lock: A lock provided with only one key and having no common key. A safety lock gets its name from 'what it is doing' rather than 'what it looks like' or 'what it is'.

(v) Key Cabinet: A lockable cabinet attached to a substation wall containing the unique keys belonging to the locks positioned on the switchgear. The cabinet is locked with a standard lock to limit access Keys to this lock Shall only be issued to Authorised Person.

Unique

Lock




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3.3 LOCKING OF HV APPARATUS IN THE STATIC SITUATION

Type of Lock Apparatus to be Locked

Standard All Apparatus except as below

Unique (Plain)

(i) Compartments containing exposed High Voltage Conductors

(ii) Busbar selector switches (iii) Voltage transformers

Unique (Red) Earthing Devices

No locks Tripping mechanisms of Apparatus controlling a circuit which needs to be available in an emergency

3.4 LOCKING OF HV APPARATUS TO FACILITATE WORK ON THE SYSTEM

Type of Lock Apparatus to be Locked

Safety Lock

To lock-off all switches at points where the circuit on which work is to be carried out could be made Live Important: A lock is a Safety Lock by what it’s doing rather than what it looks like

Unique (Red) For locking of Earthing Devices in the closed (Earth ON) position

No. Operation Locking Action

1 Isolate the circuit or Apparatus

Remove Standard Locks

2 To lock off isolated circuit Apply Safety Locks; Keys to Key Safe

3 To Earth circuit Obtain key to Unique Red Lock from key cabinet

4 To ensure circuit remains Earthed

Lock Earthing Device – ‘’ON’ with unique Red locks

5 Issue Safety Document Give Competent Person in charge of Working Party a Key Safe Key

6 Cancel Safety Document Competent Person to return Key Safe key to Key Safe

7 Remove Earths Remove (to allow operation) and re-apply Unique Red lock and return keys to key cabinet

8 Re-commission circuit Remove Safety Locks and replace with standard locks

Locking check questions

(i) Does the lock prevent the circuit becoming live? ... if so, it is a 'Safety Lock' and therefore is the key in the Key Safe?

(ii) Can I apply the Earth without removing the Safety Lock? or interfering with the point of isolation?

(iii) Can I carry out all necessary tests without removing the Safety Lock? Or interfering with the point of isolation?

The answer to all three questions should be YES ......... if not, the locking is almost certainly wrong, but be wary of exceptions.




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3.5 LOCKING OF PARTICULAR ITEMS OF SWITCHGEAR 3.5.1 Locking of Circuit Breakers

On circuit breakers with integral transfer-earthing facilities, separate red locks should be applied to prevent:

(i) Selection of Busbar Earth facility

(ii) Selection of Circuit Earth facility

A single red Earth lock could be used to prevent the selection of both earthing modes, but this method should not be adopted because removal of a single red unique lock gives access to two earthing modes, one of which may give access to a Live circuit.

When using a circuit breaker with transfer-earthing circuit, the red 'earth' lock which is removed from the selector mechanism, Shall be used to prevent the circuit breaker from being tripped mechanically after being closed to the earth position. The red 'earth' lock on the selector prevents the earth being applied and when on the trip mechanism it prevents the earth being removed. 3.5.2 Locking of Switches

General

Single handled switches have a single operating handle. This handle operates both ON/OFF or OFF/EARTH after the appropriate selection by an interlock mechanism.

A two-handle switch has two separate handles, or a single handle with three distinct positions which are all separately lockable. Locking of Single Handled Switches

By their very nature single handled switches require a variation to a normal working procedure. To simply lock the switch in the OFF position, will also prevent the Earth being applied. Therefore, the switch is locked in the isolated position by the removal of the Earth lock and moving the selector to the Earth position. The selector will now be locked in place with a Safety Lock and Caution Notice. The red earth lock will now be applied to the ON/OFF handle which is still at this point in the OFF position. This method of locking will prevent the circuit being energised from this point. Earthing will be permitted at the appropriate time by removal of the Earth lock only. On restoration of a circuit from a single handled switch, the red Earth lock is removed from the ON/Off handle and the switch is opened to the OFF position. The red Earth lock then being re-applied to the ON/OFF handle. When it is appropriate to restore the circuit, the Safety Lock and Caution Notice is removed from the service position, which is now transferred back to the selector. The switch is now locked with a standard lock. Locking of Two Handled Switches

The ON/OFF function of this switch is simply locked in the open position by a Safety Lock and Caution Notice, to achieve isolation. This still allows the main Earth switch to be used.




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The Earth switch can be operated as necessary by removing the red earth lock, moving any 'MOVE BEFORE EARTHING' devices, and then closing. The red lock is then replaced to secure the Earth. Restoration is simply a reversal of the above procedure. Switching instructions should be formatted in the following way: -

1. Location Which Substation/Switchroom am I going to?

2. Action

What am I going to do? - Open a Switch to OFF - Close a Switch to ON - Apply an Earth to a Circuit

3. Action on what?

Which Circuit?

4. What type of equipment?

• Switch • Circuit Breaker • Switchfuse • Fuse

What is it designed and rated to do?

5. Safety Precautions

Safety Lock and Caution Notice Applied Red Lock applied to Earthing Device

It is necessary to record each operation and the time it was carried out.

The ideal form of record is the Switching schedule. A switching schedule should be prepared and completed for EVERY HV job and it may be advisable for LV jobs. Remember:

"A short pencil is better than a long memory"




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A Switching schedule can be any form of document capable of recording information. These tables can be tailored to individual needs and include any number of columns to record relevant information. The pre-written schedule below is merely an example and may only form the basis of a more personalised version.




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Procedure Title: Earthing High Voltage Apparatus



Contents Page 1. Purpose .......................................................................................................... 52 2. Definitions ....................................................................................................... 52 3. Dangers .......................................................................................................... 52 4. Introduction ..................................................................................................... 52 5. Earthing .......................................................................................................... 52 6. Portable Earths ............................................................................................... 53




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SAFETY RULES PROCEDURES SRP2 - EARTHING HIGH VOLTAGE APPARATUS 1. PURPOSE

To give guidance on the positioning of earthing devices to achieve safety from the System for personnel requiring to work on or test High Voltage Apparatus. 2. DEFINITIONS

Terms printed in bold type are as defined in the HaLVE HV Electrical Safety Rules.

3. DANGERS

The main Dangers to personnel applying Earths to High Voltage Apparatus are electric shock, burns or falls, arising from one of the following:

a) The application of Earths to Live High Voltage Apparatus

b) Badly connected or insecure earthing devices

c) The incorrect sequence or method of application or removal of portable Earths 4. INTRODUCTION

4.1 Earthing of High Voltage Apparatus is carried out as part of the safety precautions to protect Persons working on or testing such Apparatus against the effects of inadvertent energisation, and induced voltages. The protection afforded by Earthing is dependent upon a combination of the following:

a) The effectiveness of the connection of Circuit Main Earths and their capability to carry the fault current until the electrical protective devices operate

b) The speed of operation of electrical protective devices in service called upon to operate in such circumstances

c) The voltage gradient to the point of earthing and the fault level at the point of work

5. EARTHING

5.1 When High Voltage Apparatus and Conductors are to be discharged and Earthed it Shall be done as follows:

a) Where reasonably practicable by the use of a circuit breaker or earthing switch provided for the purpose to make the earthing connection. When a circuit breaker is used, the trip feature Shall normally be rendered inoperative before closing, unless this is not practicable when it Shall be done afterwards. Wherever possible the use of remote operation facilities should be employed. After closing, the circuit breaker or earthing switch it Shall be locked in the Earthed position, so that it remains inoperative while it is the Circuit Main Earth.

b) Where (a) is not reasonably practicable or not applicable, the High Voltage Apparatus

and Conductors Shall be checked by means of an Approved voltage testing device or other Approved means to verify that they are not Live, and may then be discharged and Earthed by an earthing lead applied by means of an Approved earthing pole or other Approved appliance.




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6. PORTABLE EARTHS

6.1 At certain locations it may be necessary to apply more than one portable Earth lead at each point of Earthing to cater for the maximum fault level of the Apparatus. These locations and the number of Earths required Shall be detailed at the specific location.

6.2 Portable Earths Shall be examined immediately before use by the Person responsible for the application of such Earths. All defective portable earthing devices Shall be immediately withdrawn from service.

6.3 Where portable Circuit Main Earths are to be used the Senior Authorised Person Shall check that the points at which the portable Circuit Main Earths are to be applied to the High Voltage Apparatus have been correctly identified and the Earths are of adequate capacity so as to safely discharge the resultant fault current due to any inadvertent energisation after they have been secured in position.

6.4 The points of application of portable Circuit Main Earths Shall not be such as to inhibit the operation of any protective devices or other ancillary equipment that is in service and which may be required to operate.

6.5 Where it is not reasonably practicable to apply Circuit Main Earths between the point of work and the points of isolation, they may be placed in an alternative position so as to have a similar electrical effect to that which would occur if they were placed between the point of work and the points of isolation.

6.6 At no time Shall the Conductors end clamp of a portable Earth lead be allowed to remain connected, when its Earth end clamp has become detached or defective. If such a disconnected or defective portable Earth lead is the only Earth on that Conductors at that point, then an additional portable Earth lead Shall be connected between Earth and that conductor before the detached or defective portable Earth lead conductor end clamp is removed. In all cases, before the Earth end clamp is reconnected the Conductors end clamp Shall be removed.

6.7 Before a break is made in a conductor or a connection is made across a break, any Danger that could arise from voltage difference Shall be excluded. If Danger cannot otherwise be excluded, then the Conductors Shall be Earthed on both sides of and in close proximity to the point where the break or connection is to be made




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Procedure Title: Work on High Voltage Metalclad Switchgear



Contents Page 1. Definitions ........................................................................................................... 56 2. Dangers ............................................................................................................. 56 3. Identification ....................................................................................................... 56 4. General Requirements for Work on Metal clad Switchgear ................................. 57 5. Work on Busbars of Multi-Panel Switchboards .................................................. 57 6. Work on Feeder Spouts and Connections, Voltage Transformer Spouts and Connections and Single Panel Busbar Spouts and Connections ......................................................................... 58 7. Work on Cable Boxes ......................................................................................... 59 8. Work on Double Busbar Switchboards ............................................................... 60 9. Withdrawable Apparatus .................................................................................... 60 Appendix ‘3A’ - Application of Circuit Main Earths to confirm isolation

where no other means exist ............................................................. 61




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SAFETY RULES PROCEDURES SRP3 - HIGH VOLTAGE METALCLAD SWITCHGEAR 1. Definitions


2. Dangers

The main Danger to personnel working on metalclad switchgear are electric shock or burns, arising from the following:

(a) The application of earthing devices to Live Apparatus.

(b) The incorrect sequence and method of application or removal of earthing devices.

(c) Erroneously gaining access to Live Conductors. 3. Identification

3.1 Apparatus on which work or testing is to be carried out Shall be readily identifiable or have fixed to it a means of identification that will remain effective throughout the course of the work or testing.

3.2 Where access is required to compartments or spouts containing High Voltage Conductors

the Senior Authorised Person is responsible for the positive identification of these Conductors, which have been Isolated and Earthed in accordance with Sec 4.1 of the HaLVE HV Electrical Safety Rules and this Safety Rules Procedure. Where the work or testing requires the removal of covers giving access to compartments containing HV Conductors, the Senior Authorised Person Shall identify the correct access covers to be removed and provide Personal Supervision of their removal. It is therefore essential that the Senior Authorised Person is fully conversant with construction and conductor configuration of the switchgear to be worked on or tested.

3.3 Where the facility exists, the Senior Authorised Person Shall test to prove the HV

Conductors are not Live by means of an Approved voltage indicator prior to the commencement of work or testing.

3.4 Where it is not possible for the Senior Authorised Person to prove the HV conductors

are not Live, because the HV Conductors are insulated or shrouded, verification that the HV Conductors are safe to work on can be achieved by verifying that the HV Conductors are connected to earth by means of a Circuit Main Earth. This will normally be achieved by visually tracing from a Circuit Main Earth position to the proposed point of work. Where visual tracing is not possible then the Senior Authorised Person Shall verify that the HV Conductors are Earthed by applying the principles detailed in Section 3.2.

3.5 Where the Senior Authorised Person is unable to positively verify that the HV

Conductors are:

(a) Isolated and Earthed, or,

(b) are within an Isolated zone, being fully Isolated from all sources of energy and Circuit Main Earths applied against all points of HV isolation, in situations where section 5.2.3 is applicable.

the Senior Authorised Person Shall suspend all activities and seek advice from the Designated Engineer.




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3.6 During the course of work or testing no further covers Shall be removed without the

sanction of the Senior Authorised Person. The removal of further covers Shall be in accordance with paragraphs 3.2, 3.3, 3.4 and 3.5 above.

4. General Requirements for Work on Metal clad Switchgear

Before work commences on High Voltage conductors that form part of metal clad switchgear the following procedure Shall be applied:

(a) The switchgear Shall be Isolated from all sources of HV supply.

(b) Isolation Shall be confirmed, where practicable by use of an Approved voltage indicator. Where this is not practicable, confirmation of isolation Shall be achieved by the application of Circuit Main Earths as described in paragraph (c) below.

(c) A Circuit Main Earth Shall be applied against all points of HV isolation. If a Circuit Main Earth is used to confirm isolation it Shall be carried out in accordance with Appendix ‘A’ of this Safety Rules Procedure.

5. Work on Busbars of Multi-Panel Switchboards

5.1 Isolation

5.1.1 When work is to be carried out on Busbars, Busbar spouts and Busbar connections, the isolation procedures Shall be as follows:

(a) the section of the Busbars on which work is to be carried out Shall be Isolated from all points of supply from which it can be made Live;

(b) isolating arrangements Shall be Locked, where practicable, so that they cannot be operated;

(c) on withdrawable switchgear, where practicable, the shutters of Live spouts Shall be Locked shut;

(d) Caution Notices Shall be attached at all points of Isolation;

(e) Danger Notices Shall be attached, where applicable, on, or adjacent to Apparatus containing Live Conductors at the limits of the zone in which work may be carried out.

5.2 Earthing

5.2.1 Where practicable, at least one Circuit Main Earth Shall be applied to Busbars which are to be worked on.

5.2.2 Switchgear with the facility for Bus Bar Earthing

Where the facility exists, the section of Busbars on which work is to be carried out, Shall be tested by means of an Approved voltage indicator to verify that it is not Live. The checking with the HV indicator Shall be carried out on the panel at which the Circuit Main Earth is to be applied.

5.2.3 Switchgear without the facility for Bus Bar Earthing

Where no busbar earthing facility exists work may only commence after all points of isolation have been established and Circuit Main Earths applied against each point of isolation in accordance with Appendix ‘3A’.

5.3 Work or Testing

5.3.1 A Permit-to-Work or Sanction-for-Test Shall be issued in accordance with Section 4.5 or 4.6 of the HaLVE HV Electrical Safety Rules.




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5.3.2 Before the 'Receipt' section of the Permit-to-Work is signed, the Senior Authorised Person who is issuing the Permit-to-Work Shall, at the point of work, satisfy himself that the recipient is aware of the location of all adjacent Live High Voltage Apparatus and of the safety precautions to be taken by the recipient. Immediately the Senior Authorised Person has obtained the receipt signature on the Safety Document and before any work is carried out, then:

5.3.3 Where work is to be carried out on busbar spouts it Shall be carried out under the Personal Supervision of the Senior Authorised Person who Shall identify the Busbar spouts to be worked on and where necessary provide access by removing any locks applied to such spout shutters. He Shall then prove that each spout is not Live by means of an Approved voltage indicator before any work is undertaken on the spout.

5.3.4 Where work is to be carried out on Busbars or Busbar connections the Senior Authorised Person Shall identify in an Approved manner where the access is to be made. Access Shall then be made, by the removal of the appropriate cover plates, under the Personal Supervision of the Senior Authorised Person, who Shall not leave site until he is satisfied that no further access is required to complete the work and that he has taken such action to prove, that each Busbar or Busbar connection at the point of work is not Live by means of testing with an Approved voltage indicator where practical, or other Approved means.

5.3.3 No further access Shall be made to other parts of the switchboard during the course of the

work. 6. Work on Feeder Spouts and Connections, Voltage Transformer Spouts and

Connections and Single Panel Busbar Spouts and Connections

6.1 Isolation

6.1.1 When work is to be carried out on feeder and voltage transformer spouts or connections, or on the Busbar spouts or connections of a single panel, the following procedures Shall be carried out:

a) the spouts or connections on which work is to be carried out Shall be Isolated from all points of supply from which they can be made Live;

b) the isolating arrangements Shall be Locked so that they cannot be operated and the shutters of Live spouts Shall be Locked shut;

c) Caution Notices Shall be attached at all points where the circuit can be made Live;

d) Danger Notices Shall be attached, where applicable, on or adjacent to the Apparatus containing Live Conductors at the limits of the zone in which work may be carried out.

6.2 Earthing

6.2.1 Where practicable the spout contacts or connections and cable boxes Shall be checked by means of an Approved voltage indicator to verify that they are not Live.

6.2.2 The circuit Shall be Earthed with Approved earthing equipment at the point of work and where reasonably practicable, at all points of isolation from the supply. Any special appliances used for the purposes of earthing metal-enclosed switchgear Shall also be of an Approved type, but the insertion of the hand or any tool into contact spouts for this purpose is forbidden.

6.2.3 A Permit-to-Work or Sanction-for-Test Shall be issued in accordance with Section 4.6 or 4.7 of the HaLVE HV Electrical Safety Rules. Where the work to be done requires the removal of the Circuit Main Earths at the point of work the Permit-to-Work Shall state how this is permitted under Rule 6.3.1(a) below.




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6.3 Work

6.3.1 Before the 'Receipt' section of the Permit-to-Work is signed, the Senior Authorised Person who is issuing the Permit-to-Work Shall, at the point of work satisfy himself that the recipient is aware of the location of all adjacent Live High Voltage Apparatus and of the safety precautions to be taken by the recipient. Immediately the Senior Authorised Person has obtained the receipt signature on the Permit-to-Work and before any work is carried out, then:

a) Where the work is to be carried out on the feeder, voltage transformer or Busbar spouts on a single panel unit, it Shall be carried out under the Personal Supervision of a Senior Authorised Person who, not withstanding the requirements of Safety Rule 4.1, may, where necessary remove Circuit Main Earths at the point of work and provide access by removing any locks applied to such spout shutters. He Shall then prove that each spout is not Live by means of an Approved voltage indicator before any work is undertaken on the spout. On completion of the work, the Circuit Main Earths Shall be re-applied, if necessary, before the Permit-to-Work is cancelled. If the only earthing devices that can be applied to the circuit are those applied to the spouts are Circuit Main Earths then, while work is in progress no other work Shall be carried out to the circuit connected to those spouts.

b) Where work is to be carried out on feeder or voltage transformer connections on single panel Busbars or connections the Senior Authorised Person Shall identify in an Approved manner where access is to be made. Access Shall then be made by the removal of the appropriate cover plates under the Personal Supervision of the Senior Authorised Person who Shall not leave site until he is satisfied that no further access is required to complete the work and that he has taken action to prove, where practicable, that each connection in the working area is not Live by means of testing with an Approved voltage indicator or other Approved means. No further access Shall be made to other parts of the switchboard during the course of the work.

7. Work on High Voltage Cable Boxes

7.1 Isolation

7.1.1 When work is to be carried out on HV cable connections to connect or disconnect cable terminations, the following procedures Shall be carried out:

a) HV cable box connections on which work is to be carried out Shall be Isolated from all points of supply from which they can be made Live;

b) the isolating arrangements Shall be Locked where practicable, so that they cannot be operated;

c) Caution Notices Shall be attached at all points where the circuit can be made Live;

d) Danger Notices Shall be attached, where applicable, on adjacent Live Apparatus at the limits of the zone in which work may be carried out.

7.2 Earthing

7.2.1 The circuit Shall be Earthed via an Earthing Switch or other Approved earthing device at all points of HV isolation, where practicable.

7.3 Work

7.3.1 A Permit-to-Work or Sanction-for-Test Shall be issued in accordance with Safety Rule 4.6 or 4.7.

7.3.2 Before the 'Receipt' section of the Permit-to-Work is signed, the Senior Authorised

Person who is issuing the Permit-to-Work Shall, at the point of work satisfy himself that




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the recipient is aware of the location of all adjacent Live High Voltage Apparatus and of the safety precautions to be taken by the recipient. Immediately the Senior Authorised Person has obtained the receipt signature on the Permit-to-Work and before any work is carried out, then:

a) The Senior Authorised Person Shall identify the cable box to be worked on in accordance with Section 3 of this Safety Rules Procedure and Shall provide Personal Supervision for the removal of the cable box cover.

b) Where practicable, the HV terminals Shall be tested to prove that the terminals are not Live by means of an Approved voltage indicator before any work is undertaken on the cable box terminals.

8. Work on Busbars of Double Busbar Switchgear

8.1 Where work is required to be carried out on the Busbars of a Double Busbar switchboard with one set of remaining Busbars Live, where it is not practicable to prove that the Busbar to be worked is not Live, by the use of an Approved voltage indicator, then both Busbars Shall be Isolated and a Circuit Main Earth applied against each point of HV isolation.

8.2 If Voltage Transformers are fitted they Shall where practicable, be withdrawn from connection with the HV system. Where this is not practicable isolation will be achieved on the Low Voltage side by the removal of fuses or links.

8.3 Caution Notices Shall be applied at all points of isolation. 8.4 Work or testing Shall be carried out in accordance with Section 5 of this Safety Rules

Procedure. 9. Withdrawable Apparatus

9.1 Work

9.1.1 Work may only commence on withdrawable High Voltage Apparatus under the following conditions:

(a) when withdrawable High Voltage Apparatus has been disconnected from all supplies and removed from its normal housing. Its conductors Shall be discharged to earth, but need not remain connected to earth;

(b) all spout shutters not required to be opened for immediate work or operation Shall, if the spouts are not otherwise made inaccessible, be Locked shut;

(c) work, within the confines of the switch room, Shall be carried out under a Limitation-of-Access.

Appendix ‘3A’ - Application of Circuit Main Earths for work on Busbars Example 1 – Withdrawable Circuit Breakers – isolation can be confirmed by testing – see page

3.10 Example 2 – Fixed pattern Circuit Breakers where no Busbar earthing facility exists – see page

3.11




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Procedure Title: Work on High Voltage Cables



Content Page 1. Definitions ...................................................................................................... 64

2. Dangers ......................................................................................................... 64 3. Identification .................................................................................................. 64 4. General principles for working on High Voltage cables ................................... 64 5. Excavation to expose High Voltage cables ..................................................... 65 6. Specific Requirements for work on High Voltage cables ................................ 65 7. Safety Rules Procedures for identifying cables, spiking cables and High Voltage cable identification e.g.11kV ...................................................... 66

7.1 Cable Identification .................................................................................. 66

7.2 Cable Spiking .......................................................................................... 67

7.3 Exemption from Spiking ........................................................................... 67

7.4 Phase Identification Tests ....................................................................... 67

Appendix 4A - Use of Cable Identifier .................................................................. 68 Appendix 4B - Use of Cable Spiking Gun ............................................................. 71 Appendix 4C - . Phase Identity tests ...................................................................... 72 Appendix 4D - . Pressure Testing .......................................................................... 74 Appendix 4E - . Phasing out tests .......................................................................... 75




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SAFETY RULES PROCEDURE

SRP4 - WORK ON HIGH VOLTAGE CABLES 1. DEFINITIONS

Terms printed in bold type are as defined in Section 2 of HaLVE HV Electrical Safety Rules. 2. DANGERS

The main Dangers to personnel working on HV cables are electric shock, burns, asphyxiation or falls arising from:

(a) mistaking HV cables on which it is unsafe to work for those on which it is safe to work under this Safety Rules Procedure.

(b) voltage difference when the sheath or cores at the point of work are connected to a different earthing area from the one at the point of work, and an earth fault occurs in one of these earthing areas.

(c) induced voltages from cables that run physical in parallel to the cable being worked on carrying fault current, or from the cable being worked on being normally connected to an overhead line.

(d) proximity of exposed Live Apparatus, other cables or services

(e) physical conditions in the vicinity of the point of work due to deep excavations or working at height.

(f) chemicals and fumes from fluxes and other sources.

(g) the sudden release of gas from pressurised cables.

3. IDENTIFICATION

3.1 Apparatus associated with the cables on which work or testing is to be carried out Shall be readily identifiable or have fixed to it a means of identification that will remain effective throughout the course of the work or testing.

3.2 Cables Shall be identified at their terminations by means of the permanent identification label on the Apparatus to which they are connected or by their appropriate circuit identification.

4. GENERAL PRINCIPLES FOR WORKING ON HIGH VOLTAGE CABLES

4.1 Where a cable is either damaged, or has exposed conductors, no assumption Shall be made that it is Dead. No person Shall touch the insulation which covers any conductors subject to High Voltage unless the conductor is Dead, Isolated and Earthed.

4.2 Work Shall not commence on any High Voltage cable unless the Person in charge of the work is in possession of a Safety Document and personally instructed at the point of work by the Senior Authorised Person issuing the Safety Document.

4.3 Before issuing a Permit-to-Work for work on a High Voltage cable, the Senior Authorised Person, in addition to the requirements of Section 4 of the HaLVE HV Electrical Safety Rules, Shall by the use of Approved spiking procedures or other Approved means, at the point of work identify the cable to be worked on and then prove it dead. The Control Person Shall be informed before any cable is spiked.




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4.4 Where work is to be carried out on the insulated sheath system of a High Voltage cable route, additional precautions to prevent Danger from any sheath voltages Shall be taken in accordance with Safety Rules Procedures.

4.5 Where work is to be carried out on any cable or ancillary equipment associated with a High Voltage cable route which may be subject to induced voltages from other Live circuits in their proximity, then such work Shall only be carried out in accordance with Safety Rules Procedures.

4.6 A Permit-to-Work or Sanction-for-Test Shall be issued in accordance with Section 4.5 or Section 4.6 of the HaLVE Safety Rules.

4.7 Unless the work is restricted to that which can be done under a Limitation-of-Access the circuit Shall be Isolated, Earthed at all points of isolation and a Permit-to-Work issued.

5. EXCAVATION TO EXPOSE HIGH VOLTAGE CABLES

5.1 The Company's Safe Digging Policy will be used at all times and PPE equipment Shall be used as required.

5.2 Reference Shall be made to records of the cable(s) and other services (when available) and use made of an Approved detection instruments to determine the position of the required cable(s) and other cables and services in order to safely excavate at the appropriate position.

5.3 When carrying out excavations to expose Live High Voltage cables a Limited-Work-Certificate may be issued at the discretion of the Senior Authorised Person.

5.4 Care Shall be taken in deciding the extent to which mechanical means of excavation may be used, in order to avoid Danger from, or damage to, cables or other services.

5.5 If cable tiles or other cable markers, or protectors are exposed during excavation, it Shall not be assumed that they are in their correct position directly above the cable(s) they were originally intended to protect - they may have been moved by previous excavation or careless backfilling. The position of a cable is not certain until it is uncovered and identified.

5.6 Precautions Shall be taken, when appropriate, to prevent trench excavations from collapsing. Shall the excavation depth be such that a trench collapse might bury or strike and injure anyone near or in the vicinity, the excavation Shall be suitably supported.

5.7 When excavating close to a cable, spades and shovels Shall be used rather than other tools to prevent damage to the cable(s) and other services and subsequent Danger from, any services.

5.8 The work area Shall be defined and adequate precautions taken to guard, sign and illuminate the work area to protect personnel, other persons and road users (as appropriate).

5.9 The excavation Shall be made large enough to expose all the cables, pipes and ducts necessary to establish the position of the required cable(s).

5.10 Reference Shall also be made to HSE Publication HS(G)47 'Avoiding Danger from Underground Services', when excavating to expose cables. See also Safety Rules Procedure 11 – Excavation and Safe Digging.

6. SPECIFIC REQUIREMENTS FOR WORK ON HIGH VOLTAGE CABLES

6.1 Work Shall not commence on any High Voltage cable unless the Person in charge of the work is in possession of a Safety Document and personally instructed at the point of work by the Senior Authorised Person issuing the Safety Document.




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6.2 Unless the work is restricted to that which can be done under a Limitation-of-Access the circuit Shall be Isolated, Earthed at all points of isolation and a Permit-to-Work issued.

6.3 When any High Voltage cable is to be cut or opened the Senior Authorised Person issuing the Safety Document Shall identify the cable as that covered by the Safety Document and on which it is safe to work. Identification Shall be by reference to the appropriate cable records (where available), supplemented where necessary, by tests.

6.4 No work, other than work external to the pressurised parts, Shall be carried out on gas pressurised cables, or associated gas pressure equipment until the gas pressure has been adjusted to a level that avoids Danger.

7. SAFETY RULES PROCEDURES FOR IDENTIFYING CABLES, SPIKING CABLES AND HV CABLE IDENTIFICATION

7.1 Cable Identification

7.1.1 Before any work commences on a High Voltage cable the Senior Authorised Person issuing the Safety Document Shall identify the cable as that detailed on the Safety Document and on which it is safe to work.

7.1.2 The Senior Authorised Person Shall identify the cable using the appropriate cable route records (where available) supplemented where necessary, by tests.

7.1.3 The identified cable Shall be suitably marked at the intended point of work by the Senior Authorised Person issuing the Safety Document.

7.1.4 The cable Shall be Isolated, Earthed and a Sanction-for-Test Shall be issued before cable identification is commenced. The Circuit Main Earth at one end of the cable may be removed and a cable identifier connected to the cores to identify the cable at the point of work.

7.1.5 The cable Shall be spiked by the Senior Authorised Person issuing the Safety Document, using an Approved spiking device at any point where the cable has to be cut, unless it is established that there can be no error in the identification of the cable by it being visibly traced over its whole length from the point of work to:

(i) a termination where a Circuit Main Earth is confirmed applied or the terminal Apparatus has been proved not to be Live and is clearly identified,

or

(ii) a point on the cable that has been previously identified and the conductor worked on, after which work the cable has not been made Live.

7.1.6 Identification through visual tracing is not acceptable if the cable is hidden from view for any distance, no matter how small.

7.1.7 Identification, the clear detection of a 'rise and fall' in the signal by moving the detector along the length of the cable, and around its circumference is essential before the Spiking Gun is fitted to the cable.

7.1.8 Where it is still not possible to identify the cable then:

(i) at the appropriate ends on each side of the point of work Portable Earths Shall be substituted for the Circuit Main Earth. These Shall be at least 16mm² copper equivalent cross-sectional area;

(ii) following the application of Portable Earths at the appropriate ends, on each side of the point of work, any other Circuit Main Earths Shall be removed;




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(iii) on one side of the point of work, the portable Earths on two of the phase Conductors Shall be removed and the two-phase conductors connected together free from Earth. The third conductor Shall be connected to Earth;

(iv) on the other side of the point of work the Portable Earths on the same two conductors Shall be removed, the third phase conductor remaining connected to Earth;

(v) an Approved cable identifier Shall then be connected to these two cable cores, disconnected from Earth, and the cable identified at the point of work.

7.1.9 Where more than one cable exists at the point of work, each cable Shall be identified, before any cable spiking starts.

See also Appendix 4A - Use of Cable Identifier

7.2 Cable Spiking

7.2.1 Where the cable is to be spiked the following sequence Shall be applied:

(i) cartridges Shall be in the custody of the Senior Authorised Person prior to spiking;

(ii) the spiking gun Shall be fitted under the Personal Supervision of the Senior Authorised Person;

(iii) with the cable identifier still connected, the cable Shall be spiked, the spike to remain in position until after the re-application of the Circuit Main Earths.

(iv) it is recommended that a time of at least 3 minutes Shall elapse between spiking and the removal of the spiking gun.

(v) the Senior Authorised Person Shall confirm that the spiking has been effective by checking the cable identifier signal on each side of the spike. The signal Shall have disappeared or diminished on the side of the spike remote from the cable identifier.

7.2.2 The Senior Authorised Person is responsible for the removal of the cable identifier and re-application of the Circuit Main Earths to all phase Conductors at the ends of the circuit.

See also Appendix 4B - Use of Cable Spiking Gun 7.3 Exemption from Spiking

7.3.1 The following work may commence on cables that have not been spiked provided that the cable is identified and marked by the Senior Authorised Person in the presence of the Competent Person only if:

(i) spiking would cause unacceptable damage to the cable, particularly oil and gas ways, in oil and gas pressurised cables.

(ii) the cable is only to be physically moved.

(iii) the cable can be visibly traced along its entire length from a termination where a Circuit Main Earth is confirmed applied or the terminal Apparatus has been proved not to be Live and is clearly identified (reference paragraph 7.1.5).

7.4 Phase Identification Tests

7.4.1 The Senior Authorised Person Shall then carry out the necessary phase identification tests, removing the minimum number of Circuit Main Earths required.

7.4.2 The Conductor phase identity Shall be written down and also given verbally.




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7.4.3 Before work is resumed, all Circuit Main Earths Shall be replaced on all phase conductors by the Senior Authorised Person. The Senior Authorised Person may be assisted by a Competent Person under his Personal Supervision or an Authorised Person under his Immediate Supervision.

7.4.4 The Senior Authorised Person in charge of the work Shall cancel the Sanction-for-Test used for cable and phase identification.

7.4.5 When work is to be resumed the safety precautions achieving safety from the System Shall first be confirmed by the Senior Authorised Person who is to issue the Permit-to-Work.




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Appendix 4A - Use of Cable Identifier It is vital that a HV cable has been correctly identified as the one that is isolated and earthed before work starts. To ensure that this is so the following procedure Shall be followed.

• At S/S 'A' isolate the cable.

• At S/S 'B' isolate the cable.

• At S/S 'B' earth the cable.

• At S/S 'A' earth the cable.

• At S/S 'A' insert test bushings onto the earthed circuit.

• Attach the cable identifier to 2 cores and activate.

• At S/S 'A' remove the earth.

• At the point of work I/d the cable by: -

- the strength of signal

- rise and fall of the signal along the length of the cable

NOTE: Where no facility exists to earth one end of the circuit, or short circuit the cable cores,

(e.g. a radial feeder directly connected to a HV/LV transformer), the signal generator will not function, as there will be no effective return path for the signal. In such circumstances the Senior Authorised Person Shall determine the safety measures necessary in accordance with AP 4 – ‘Safety Rules Procedures for Identifying Cables, Spiking Cables and HV Cable Identification’ - Section 7, to ensure that the correct cable is positively identified. The use of cable records Shall not be the sole means of identifying a HV cable.

CableIdentifier

Substation

‘A’

Substation

‘B’

Method 1

Joint hole




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Rise and Fall

If the Cable Identifier is connected to the RED and YELLOW cores and the detector head run along the outer sheath of the cable, the signal will be quietest when both cores are furthest from the detector - due to the lay of the cable (Position 1), and loudest when they are nearest to the detector (Position 2).

If the volume is the same along the length of the cable YOU’VE GOT THE WRONG ONE!! This is another cable picking up an induced signal from the one you want.

If it is difficult to get a strong signal on one cable only, i.e. other cables appear to radiate a signal, then Method 2 Shall be used. This requires the removal of the earth from the remote end, earthing one core at either end, shorting two cores at the remote end and applying the Cable Identifier to the two shorted cores as illustrated below (Method 2).




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Appendix 4B - Use of Cable Spiking Gun

Once you have decided which is the most likely cable you Shall attach the cable spiking gun. What Does It Do?

The spiking gun is a device which penetrates the cable with a steel blade

When fired, the blade offers a short-circuit between the cores of the cable. This means the signal, sent from one-end of the circuit no longer has to travel to the Circuit Main Earth before it can return to the source.

After firing the signal on the “sending” side of the spiking gun is very much stronger than on the Circuit Main Earth side.

It is only when you see this significant difference in signal strength, on either side of the spiking gun that you have positively identified the cable.

Remember the cable spiking gun is not a tool to reduce the effort of cutting the cable. Its job is to identify the cable circuit you have isolated and earthed ready for work. IMPORTANT: Part of the preparation for Cable Spiking is a Risk Assessment of the effects of firing the Spiking Gun: -

• the Danger associated with the possibility of spiking a Live cable - all persons Shall be kept well away from the point of spiking.

• the effect of the 'BANG' on people in the vicinity - adequate warning needs to be given prior to firing, to minimise the effects.

Procedure (summary from Section 7.2)

Where the cable is to be spiked the following sequence Shall be applied:

(i) cartridges Shall be in the custody of the Senior Authorised Person prior to spiking;

(ii) the spiking gun Shall be fitted under the Personal Supervision of the Senior Authorised Person;

(iii) the Senior Authorised Person Shall advise the Control Person of his intention to spike the cable immediately prior to spiking;

(iv) with the cable identifier still connected, the cable Shall be spiked, the spike to remain in position until after the re-application of the Circuit Main Earths.

(v) the Senior Authorised Person Shall advise the Control Person that the cable has been spiked. The Control Person Shall record the time of spiking in case a loss of supply is reported.

(vi) it is recommended that a time of at least 3 minutes Shall elapse between spiking and the removal of the spiking gun.

(vii) the Senior Authorised Person Shall confirm that the spiking has been effective by checking the cable identifier signal on each side of the spike. The signal Shall have disappeared or diminished on the side of the spike remote from the cable identifier.

(viii) The Senior Authorised Person is responsible for the removal of the cable identifier and re-application of the Circuit Main Earth to all phase conductors at the ends of the circuit.




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Appendix 4C - Phase Identity Tests It is vital that when cables are jointed the phase relationship, between the Red, Yellow and Blue phases are retained, i.e. that there is no crossing of the phases between one end of the cable and the other. If not, upon re-energisation 3 phase drives may run in reverse and back-feeding supplies will result in all circuits tripping under fault. The core numbers of High Voltage cables are not connected to the Red, Yellow and Blue phase in any particular order and therefore the core numbers of High Voltage cables Shall be positively identified as to which phase they belong to prior to jointing them. The various techniques that can be used to identify the phase identity of individual cores are illustrated on the next page. IMPORTANT: when core phase colours are identified they Shall be recorded in relation to which cable end they belong to and their relationship to the physical environment recorded as illustrated below.

The jointer Shall be given a sketch or diagram confirming the cores to be jointed. This is often drawn on the reverse side of the Permit-for-Work. See next page for methods




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Phase Identity Tests




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Appendix 4D - Pressure Testing The Need to Test

The Electricity at Work Regulations require that all electrical equipment Shall be fit for the duty that it is expected to perform. An important technique in achieving this is Pressure Testing or Over Voltage testing. The purpose is to ensure that the insulation between all conductors is sufficient to prevent short-circuits occur during use. Equipment Available

The standard device used to carry out these tests is the D.C. Test Set. There are a range of devices available from a simple 1000V Megger to much more sophisticated (and expensive!) devices delivering up to 50 kV dc across two output terminals. Pass / Fail Conditions When a cable is tested the amount of leakage current, between the conductors under test, is measured. This is the measure which indicates how effective the insulation actually is. The acceptability of test results will depend on the minimum values standards set by HaLVE for individual installations and connected equipment.

Typical D.C. Overvoltage Test Set




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Appendix 4E - Phasing Out Tests Phasing Out Tests

The final test before returning a circuit to its normal duties it is vital to make sure that its phase relationships are correct. The following procedure Shall be applied whenever any jointing work has taken place. The circuit, shown, below for instance, has been altered by the addition of a joint after the cable was damaged during an excavation. The sections indicated by the purple arrows have been unaffected by the work.

The section indicated by the orange arrows, however, are unproven. This section extends from the joint to the Cable Spouts in the HV Circuit Breaker at S/S 'A'.

If the circuit breaker is closed without confirmation tests, and a mistake has been made within the joint, a Phase to Phase fault condition will apply, which cause supply failure and possible explosion.

Before we can restore the circuit to normal duties two tests Shall be completed:

Joint

? unchanged

Network status - changed or unchanged?

(Are the phase connections known to be correct?)

S/Stn.’B’

Busbar Spouts

Circuit Spouts

HV Circuit

Breaker

S/Stn.’A’

Y

R

B

Y

R

B




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Phasing Out

Confirming that both sets of 3 phases across the affected switch match.

Failure to satisfy this requirement will result in a phase-phase short circuit and possible explosion.

Phase Rotation The order in which each phase achieves its peak voltage is critical. Normal phase rotation is R-Y-B. Reverse phase rotation occurs when the phases are connected in a different order, e.g. R-B-Y. The effect could be that three phase machines (motors, etc.) will run backwards or paralleled supplies do not phase out and a phase to phase short circuit occurs.




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Testing Procedure

The main method of Phasing Out is by the use of HV Indicators: - High Voltage Method

This is only possible if there is withdrawable HV switchgear at one end of the circuit which has been worked on. A typical circuit is shown below

The cable that has been altered Shall first be over-voltage tested and then energised (in this case from S/S 'B').

Using specially designed equipment (Phasing Sticks) the voltage difference across the Busbar and Cable spouts is compared to ensure that they are at the same potential and phase angle.

It is only possible to 'Close' the Circuit Breaker at S/S 'A' when it has been confirmed that the phasing is correct. Using Test Sticks

The order of the tests and the results that Shall be obtained are as follows: -

(NB. The HVI’s referred to are Edgecumbe–Peebles. It is vital that you make sure that you are familiar with the instrument that you are using)

Remember—If all else fails—READ THE INSTRUCTIONS!




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Test 1 - Red Phases Instrument Shall read: - 12.6kV - IN PHASE (based on 11kV system voltage)

Test 2 - Red (Busbar) -Yellow Circuit Instrument Shall read 6.3kV - OUT OF PHASE (based on 11kV system voltage)

Test 3 - Yellow Phases Instrument Shall read: - 12.6kV - IN PHASE (based on 11kV system voltage)

Test 4 Yellow (Busbar) - Blue Circuit Instrument Shall read 6.3kV - OUT OF PHASE (based on 11kV system voltage)

Test 5 - Blue Phases Instrument Shall read: - 12.6kV - IN PHASE (based on 11kV system voltage) It is now safe to parallel the circuit and then restore to its normal running arrangements

Low Voltage Method

If the facility does not exist to phase out across the Busbar and Circuit spouts of a HV withdrawable circuit breaker, then the phasing must be checked using the Low Voltage System. To phase out at Low Voltage requires feeding a HV / LV transformer from a HV source that has not been disturbed by alterations and checking the phase rotation and if possible that it phases out at LV, against an unaltered LV source. The transformer is then fed via the altered HV cable and phase rotation and LV phasing out checked. The illustration overleaf shows Substation 'X' connected into a HV ring circuit.




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Switch 'A' should be a point of isolation for the altered section of HV cable and should 'OPEN', Safety Locked and Cautioned. Switch 'B' should be CLOSED, providing the alternative feed to Substation 'X'. STEP 1 - Secure LV supplies - if LV interconnection is possible from another Substation. OPEN

LV Transformer switch. STEP 2 - check Phase Rotation. Phase out across LV terminals as illustrated - if an alternative

LV supply can be obtained from another substation (if LV interconnection is possible) STEP 3 - OPEN Switch 'B' (apply Unique Lock to maintain non-parallel condition). CLOSE Switch

'A' to energise transformer from altered HV circuit. Check Phase rotation and phase out across LV terminals (if possible).

STEP 4 - if Phase rotation and Low Voltage system phases out it should be in order to CLOSE

Switch 'B' and prove the parallel connection. IMPORTANT:

If Phasing out across the LV terminals was not possible, due to no alternative interconnected supply being available, then it must be remembered that a Phase rotation check is not a 100% test. There will always be some element of risk that the cable core colours were all cross jointed and were connected in such a way that the Phase Rotation was still correct. In practice this is very unlikely. If there are practical difficulties in phasing out, consideration should be given to confirm that the cable cores are correctly jointed after they have been 'ferruled through', by cancelling the Permit(s)-to-Work at this point in the job and issuing a Sanction-for-Test to 'bell' the cores through - testing the core colours from one end of the circuit to the other. On completion of testing the Sanction-for-Test is cancelled and a Permit(s)-to-Work issued to complete the jointing.

LV Busbars

HV / LV transformer

Check phaserotation andphasing

Joint

Altered HVcable

Switch ‘A’ Switch ‘B’

Unaltered HV cable(alternative HV feed)

Substation ‘X’




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Procedure Title: Work on High Voltage Transformers



Contents Page 1. Definitions ...................................................................................................... 82 2. Dangers ......................................................................................................... 82 3. Identification .................................................................................................. 82 4. Isolation ......................................................................................................... 82 5. Earthing ......................................................................................................... 83 6. Work on Low Voltage side of transformer ...................................................... 84




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SAFETY RULES PROCEDURE SRP5 - WORK ON TRANSFORMERS 1. DEFINITIONS

Terms printed in bold type are as defined in Section 2 of the HaLVE HV Electrical Safety Rules. 2. DANGERS

The main Dangers to personnel working on transformers are electric shock, burns, or falling, arising from the possibility of personnel mistaking Apparatus which is Live, or Shall be considered to be Live, for that on which it is safe to work. 3. IDENTIFICATION

Apparatus on which work or testing is to be carried out Shall be readily identifiable or have fixed to it a means of identification which will remain effective throughout the course of the work or testing. 4. ISOLATION

4.1 When work is to be carried out on the connections to or the windings of a transformer, the switchgear or fuse-gear controlling all windings Shall be opened or the windings or connections Isolated by other Approved means from Live conductors.

4.2 Additionally, to prevent the possibility of the transformer being made live by back-feeds, all Low Voltage fuses or links on associated voltage or auxiliary transformers Shall be withdrawn and, where practicable, the voltage or auxiliary transformers Isolated.

4.3 The transformer Shall be Isolated from all common neutral earthing Apparatus from which it may become Live. This does not require the disconnection of solidly Earthed neutrals or neutral Apparatus connected solely to the transformer on which work is to be done.

4.4 Where work is to be carried out on a High Voltage to Low Voltage transformer and the Low Voltage windings of the transformer are controlled by a switch or isolator, the switch or isolator Shall be secured open in an Approved manner. In other cases, arrangements Shall be made to ensure that the Low Voltage windings are Isolated from all sources of Low Voltage supply.

4.5 Before any withdrawable voltage transformer is Isolated or re-connected, the associated High Voltage connections, Shall where reasonably practicable, be made Dead. If it is suspected that the voltage transformer is faulty the associated busbars or feeder connections Shall be made dead before it is Isolated.

4.6 Caution Notices Shall be attached at all points of isolation including those of Low Voltage.




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5. EARTHING

5.5 The transformer Shall be Earthed with Approved Earthing Devices at all points of isolation from High Voltage supplies.

5.6 Before a Permit-to-Work or Sanction-for-Test is issued the Senior Authorised Person Shall, at the point of work, identify in a suitable manner, the transformer to be worked upon.

5.7 A Permit-to-Work or Sanction-for-Test Shall be issued in accordance with Section 4.1 of the HaLVE HV Electrical Safety Rules.

Isolation and Earthing of a typical 11,000V / 250V transformer




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6. WORK ON LOW VOLTAGE SIDE OF TRANSFORMER

6.1 Where work is to be carried out on the Low Voltage side of a HV/LV transformer between the transformer and the LV point of isolation, the isolation and earthing arrangements as specified in Section 4 and 5 above Shall be applied and a Permit-to-Work issued.

6.2 Where there is a requirement work on the LV isolated Apparatus at, or in close proximity to the LV point isolation, the Senior Authorised Person Shall risk assess the proposed work activity in order to ensure that the work activity can be carried out safely, where there may be a Danger from adjacent Live Apparatus or Conductors.

Example where a Permit-to-Work is required on Low Voltage side of HV/LV Transformer




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Procedure Title: Access to Substations and Operational Areas



Contents Page 1. Introduction .................................................................................................... 86 2. Access ........................................................................................................... 86 3. Precautions Prior to entry of a Substation or an electrical container................ 86 4. Precautions Upon Entry of a Substation or an electrical container .................. 87 5. Precautions on Exit of a Substation or an electrical container ......................... 87 Appendix AP6 – Substation Access Checklist ...................................................... 88




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SAFETY RULES PROCEDURE SRP6 - ACCESS TO SUBSTATIONS AND OPERATIONAL AREAS 1. Introduction

This procedure is to be followed when a Substation is entered which forms part of an electrical network or System

Definitions applicable to this Safety Rules Procedure:

Substations – premises that house electrical Apparatus for the generation and/or distribution of electrical energy. Access to such Substations premises Shall be strictly controlled by the HaLVE and/or the company that has operational and maintenance responsibility for the Substation.

2. Access

No person Shall enter or remain in a Live Substation unless they are a Competent Person or are personally supervised by a Competent Person. 3. Precautions Prior to Entry of a Substation or an electrical container

3.1 Before entering any Substation, the Competent Person Shall comply with the following requirements:

(i) Check for any breaches of security, signs of external damage.

(ii) Check any inadequacies in security arrangements, for instance those which may have deteriorated as a result of adjacent building works.

(iii) Check any deterioration or inadequacy of warning notices or other statutory signs.

(iv) Observe any requirement in respect of emergency procedures both prior to and during entry.

(v) Comply with Company Personal Protective Equipment (PPE) requirements in order to protect against Step and Touch potentials that may arise during the course of work or testing.

N.B. The requirements for PPE will vary according to the operational status of the installation (e.g. construction, commissioning, operations and maintenance) and appropriate PPE Shall be worn at all times when Persons are within an operational area.

3.2 Prior to entry consideration Shall be given to the Dangers associated with toxic and flammable gases, oxygen deficient atmospheres and high temperatures. If these are suspected in a Substation, Approved detectors Shall be used before the Substation is entered. If the tests prove positive immediate steps Shall be taken to ventilate the area by approved means. The source of Danger Shall be traced and work and operations Shall not proceed. It is forbidden to use any electrical item within the Substation – for instance light switches or sockets until it has been confirmed by using Approved detectors that it is safe to do so.

3.3 No person Shall use naked flames in any Substation or an electrical container, until authorised by the Person in charge that it is safe to do so, and issued with a Hot Work Permit.

3.4 Any observed abnormal condition e.g. damage, breaches in security, inadequate signs should be reported immediately to the Control Person. Where such conditions present an immediate Danger, the appropriate remedial action will be carried out before work commences.




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3.5 Confirm that you have arrived at the correct Substation. 4. Precautions Upon Entry of a Substation or an electrical container

4.1 Upon entering a Substation or an electrical container you Shall:

(i) Look for signs of internal damage.

(ii) Look for signs of illegal entry, interference or misuse.

(iii) All persons entering the Substation Shall wear the appropriate Approved Personal Protective Equipment required to carry out the work or operations being undertaken. As a minimum this Shall include safety boots and flame-retardant coveralls.

4.2 Ensure that you are familiar with any emergency exits and means of escape from the Substation and that they are not obstructed.

4.3 Visually check the safe condition of Apparatus in particular those items to be worked upon or is in close proximity of the zone of work.

4.4 Record your name, date and time in the Substation Log-Book and the purpose of visit.

4.5 Report any abnormalities to the Control Person.

4.6 Observe any precautions taken prior to entry that continue to be appropriate.

4.7 Some areas may be designated as a confined space. These areas Shall be locked, with signage attached and entry to such areas is restricted to appropriately authorised Competent Persons.

4.8 All appropriate warning notices displayed Shall be followed.

4.9 Substations Shall not be used as rest rooms, general work areas, etc. The temporary storage of specific site materials at a Substation is acceptable provided that it does not impinge on Access or Egress or does pose a hazard. The storage of flammable, corrosive or toxic substances or materials must adequate risk assessed prior to any temporary storage and such storage adequately controlled.

4.10 Competent Persons, who have entered the Substation for the purpose of reading instruments, Shall be limited to that activity. No other actions are to be undertaken whilst in the Substation, and on completion of the works they Shall then exit the Substation ensuring that it is secured before leaving.

4.11 The entry of the Substation will be recorded in the Substation Log Book.

5. Precautions on Exit of a Substation or an electrical container

5.1 Before leaving a Substation remove all rubbish / debris that has accumulated as a result of the work being carried out, both internally and externally leaving the substation tidy. If any other rubbish / debris that has been left in the Substation then this should be reported to the Control Person.

5.2 Make an entry in the Log Book to confirm that you have left the Substation or an electrical container, and record the condition of the Substation internally and externally.

5.3 Inform the Control Person that you have left the Substation, and that the works are complete.

5.4 Switch off lighting.

5.5 Lock doors and secure Substation to prevent unauthorised access.




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Appendix AP6 – Substation Access Checklist

1. BEFORE YOU ENTER:

Question Action Next step

1.1 Are you at the correct Substation? Wearing PPE?

Check Substation Name/No. Report any damage or defect to substation nameplate. If satisfactory proceed to next item

1.2 Who knows you are there? Contact Control Room or Control Person

1.3 Structural integrity:

a) Are walls, roof, doors, windows & fencing in sound condition?

Record & report any defects If serious damage / deterioration do not enter

b) Are there any signs of theft/vandalism?

Record & report any evidence If serious damage / deterioration do not enter

c) Are downpipes & guttering OK? Record & report any defects

d) Are there any potential man-traps? Check for razor blades / needles in door locks and handles

If there are hazards, report and remove/make safe hazard before entering substation.

1.4 Automatic Firefighting equipment? If fitted – what type & how does it work? If appropriate – set to manual control and lock off & label 2. ON ENTERING AN INDOOR SUBSTATION:

2.1 Before switching the light on - is gas present?

Check for gas – smell, if in doubt – refer to Supervisor

Ventilate substation if necessary by leaving door open for a short time (not unattended)

2.2 Are there any unusual sounds / smells?

Check if there are any unusual sounds or smells

If unusual sounds / smells exist – STOP – leave and secure Substation – report situation.

2.3 Is light switch close to any live conductors?

Check that light switch is not close to any live conductors

If OK – switch light(s) on

2.4 Is lighting level adequate? Consider the need for torch / additional portable lighting.

If lighting level OK for intended work activity proceed to next step

2.5 What is the condition of floor? Check that its not wet/slippery If hazards exist decide and take action.

2.6 Are any trench covers missing or loose?

Identify hazards that could cause a fall or trip If hazards exist decide and take action. Report any damaged or missing trench covers.

2.7 Substation equipment / apparatus Visually inspect (externally) for soundness If equipment / apparatus is showing signs of distress / poor condition – STOP – report and get advice before proceeding

2.8 Substation Earthing Visually inspect for soundness If Earthing damaged or missing leave substation and report immediately

2.9 Is Substation heating (if fitted) functioning?

Check for dampness which could cause deterioration to equipment and building

Visually inspect, record and report any defects. Assess potential risk associated with dampness

2.10 Substation Log Book? Record details of visit




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Procedure Title: Testing of High Voltage Apparatus



Contents Page 1. Definitions ...................................................................................................... 90 2. Dangers ......................................................................................................... 90 3. Identification .................................................................................................. 90 4. Preparation for Testing .................................................................................. 90 5. Testing ........................................................................................................... 90 6. Completion of Testing .................................................................................... 91




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SAFETY RULES PROCEDURES SRP7 - TESTING OF HIGH VOLTAGE APPARATUS 1. DEFINITIONS


2. DANGERS

The main Dangers to personnel during the course of testing are electric shock, burns, or physical damage arising from one of the following:

(a) Inadvertent or erroneous contact with the System to which Apparatus is normally connected.

(b) Electrical energy and mechanical pressures and forces imposed by testing. 3. IDENTIFICATION

High Voltage Apparatus on which testing is to be carried out Shall be readily identifiable or have fixed to it a means of identification that will remain effective throughout the course of the testing.

4. PREPARATION FOR TESTING

4.1 The Senior Authorised Person Shall ensure that there is no other Safety Document in force for the Apparatus on which he/she is to issue a Sanction-for-Test.

4.2 The Apparatus on which testing is to be done Shall be Isolated and prepared for testing. This preparation Shall include the following:

(a) The placing of Danger Notices on any Apparatus which may give rise to Danger and which will be in the vicinity of persons carrying out the testing.

(b) Where necessary to avoid Danger the visible identification of the test area and its boundaries and limits.

4.3 The Apparatus in the test area Shall be Isolated from all supplies other than those test supplies necessary for the required testing. The Keys for the safety locks for those points of isolation which Shall be maintained for the period of the test Shall be placed in a Key Safe.

4.4 A Sanction-for-Test, the Key Safe Keys where appropriate and such safety lock Keys as are necessary to enable the testing to be done, Shall be issued to and received by the Authorised Person together with, where applicable, any necessary Additional Earths.

5. TESTING

5.1 Under the terms of the Sanction-for-Test the recipient is responsible for all matters of safety concerned with the test and for the control function within the test area. To enable testing to be done he may, if specified on the Sanction-for-Test, remove, replace or instruct to be removed or replaced, Circuit Main Earths. He may also operate, or instruct to be operated, Apparatus within the test area. Essential minor work associated with testing may also be done under the Sanction-for-Test.

5.2 Before testing commences, the Authorised Person in charge of the testing Shall ensure, where practicable, that notices reading 'Danger - Testing Area' are attached in conspicuous positions inside the test area facing outwards, such that they will be seen by persons approaching the test area.




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5.3 Where Apparatus is to have test, voltage applied to it and the Apparatus has a remote end that may be made Live by the test voltage, then the remote end of that Apparatus Shall be safeguarded so as to prevent Danger.

5.4 If the remote end of the Apparatus which may become Live by the test voltage is readily accessible from ground level, i.e. is not within a locked compartment or on a structure or tower, then it is the responsibility of the Authorised Person who receives the Sanction-for-Test to obtain confirmation that the potentially Live Apparatus has been included within a barrier system which is under the control of a Competent Person before a test voltage is applied. It is the responsibility of that Competent Person to ensure that any person, including himself, does not approach the Apparatus unless instructed to do so by the Authorised Person in charge of the testing.

6. COMPLETION OF TESTING

When a Sanction-for-Test is to be cleared, all changes of the condition of isolation and earthing within the test area from that at the time of issue of the Sanction-for-Test Shall be fully specified on the Sanction-for-Test by the Authorised Person who clears it.




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Procedure No.: SAFETY RULES PROCEDURE NO. 8

Procedure Title: Areas with Automatic Fire Suppression Systems



Contents Page

1. Purpose ......................................................................................................... 94

2. Scope ............................................................................................................ 94

3. Identification .................................................................................................. 94

4. Responsibilities .............................................................................................. 94

5. Definitions ...................................................................................................... 94

6. Dangers ......................................................................................................... 94

7. Precautions in Fire Protected Areas ............................................................... 95




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SRP8 - AREAS WITH AUTOMATIC FIRE SUPPRESSION SYSTEMS

1. Purpose

To ensure that following appropriate risk assessment, any work carried out in Fire Protected Areas is undertaken safely, with the correct equipment and PPE, and is in compliance with the relevant legislation.

2. Scope

This procedure applies to the following where the work or testing is to be carried out under the HaLVE HV Electrical Safety Rules:

All work in Fire Protected Areas

All persons engaged to work in Fire Protected Areas

All Apparatus within Fire Protected Areas

3. Identification

Apparatus on which work or testing is to be carried out must be readily identifiable or have fixed to it a means of identification, which will remain effective throughout the course of the work or testing.

4. Responsibilities

4.1 All persons who work in Fire Protected Areas have a duty to comply with this procedure.

4.2 All line managers supervising work in Fire Protected Areas are to issue and implement this instruction to appropriate staff at safety meetings and appropriate group congregations which Shall include contractors.

5. Definitions

Terms printed in bold type are as defined in the HaLVE HV Electrical Safety Rules.

6. Dangers

6.1 The main Dangers to personnel for operation of fixed fire protection equipment are:

(i) Asphyxiation by the gases or chemical Extinguishants used.

(ii) Poisoning due to toxicity of Extinguishants.

(iii) Falling or striking against objects due to poor visibility after the release of gases or chemical Extinguishants.

(iv) Low temperature.

(v) The effect of excessive noise.




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7. Precautions in Fire Protected Areas

7.1 Equipment Incorporating Water as an Extinguishant

(i) Water Sprinkler System

Water used as an extinguishing agent from a sprinkler system does not, in itself, cause Danger. Such a system may generally be left in service when Persons enter, work or testing in an area or space protected by a sprinkler system. The only occasion when such firefighting equipment Shall be Isolated is when the work or testing being done in the area or space, such as Live Low Voltage working, could cause additional Danger due to the Live parts and the safe methods or work used being affected by impure water.

(ii) Emulsifier System

Before work or testing commences in an area or space protected by water emulsifier firefighting equipment such that, if it operates it could cause Danger then that firefighting equipment must be Isolated.

7.2 Equipment Incorporating Gas or Chemical Extinguishants

The following precautions must be taken if Persons are to enter or work in areas in which the operation of automatic fire protection equipment, using gas or chemical Extinguishants, could cause Danger:

(i) Whether or not the area is fitted with mechanical access interlocks, the automatic control of the firefighting equipment Shall be rendered inoperative and the control placed on "Manual Control" and if practicable locked. These actions Shall be recorded in the Log Book where provided at the location where work is taking place.

(ii) A Notice requiring the above action should be displayed at the points of access to area.

(iii) Caution Notices(s) indicating that the control is on “Manual Control” Shall be fixed to the automatic / manual selector.

(iv) Precautions taken to render the automatic control inoperative must be noted on any Safety Document issued for work in the protected area.

(v) Automatic control of the firefighting equipment Shall be restored immediately all persons have withdrawn from the area and all access doors have been Locked.

7.3 Access to Area following the Operation of Fire Protection Equipment

(i) Before permitting Persons, who are not wearing breathing apparatus to enter areas into which gas or chemical Extinguishants have been discharged, the areas must be thoroughly ventilated and the atmosphere verified as safe by an Authorised/Senior Authorised Person. If the atmosphere cannot be verified as safe, Approved breathing apparatus must be worn.

(ii) Where the equipment has been operated other than as firefighting equipment, when a Person using Approved breathing apparatus is required to enter the area, he Shall be able to communicate with another Person stationed immediately outside the area. An additional Person Shall be stationed outside the area who must have immediately available, and be able to use, another set of Approved breathing apparatus.

(iii) Where the equipment has been operated in a fire-fighting situation and Persons using Approved breathing apparatus enter the area, the Home Office (Fire Department) requirements apply.




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Procedure Title: Work on or Testing on Customers’ HV and LV Systems



Contents Page

1. Purpose ................................................................................................ 98

2. Scope ................................................................................................... 98

3. Identification ......................................................................................... 98

4. Definitions ............................................................................................. 98

5. Dangers ................................................................................................ 99

6. Responsibilities ..................................................................................... 99

7. Objections ............................................................................................. 99

8. Introduction ........................................................................................... 99

9. Basic principles for working on Customers HV or LV systems ............... 100

10. Stages for planning and execution of the work ...................................... 101

11. The Planning Stage (Stage 1) ............................................................... 101

12. Work on or testing of Customers HV installations ................................. 102

13. Work on or testing of Customers LV installations .................................. 105

14. Emergency work or work under fault conditions .................................... 109




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SRP9 – WORKING ON OR TESTING ON CUSTOMERS’ HV AND LV SYSTEMS 1. Purpose

1.1 This Approved Procedure sets out the procedures to be followed when work is to be undertaken by the Company, or its formally appointed contractors, undertaking the work on behalf of the Company on customers High Voltage and Low Voltage systems.

1.2 It clearly identifies the various stages involved in the planning, organisation and execution of the work in order that the work will be carried out safely and in accordance with clearly defined Company standards.

2. Scope

2.1 This Approved Procedure applies to the following:

a) All work or testing on Customer's electrical equipment and systems carried out by, or on behalf of the Company, on Customer's premises.

b) All persons engaged to project manage or to carry out work or testing on Customer's electrical equipment and systems, on behalf of the Company, on Customer's premises

c) When Company personnel are contracted to take control and operate a Customer’s High Voltage system

d) When Company personnel are involved with the control of Safety at the interface of Distribution Network Operators, Distribution Network and the Customer’s system.

2.2 This procedure does not apply to work undertaken as part of a ‘competition in connection’ contract. This type of work will be completed in accordance with the relevant Electrical Safety Rules.

3. Identification

3.1 Plant and Apparatus on which work or testing is to be carried out must be readily identifiable or have fixed to it, a means of identification that will remain effective throughout the course of the work or testing.

4. Definitions

4.1 The words printed in bold text within this document are either headings or definitions. The definitions are either defined within this section or the Company’s High Voltage Safety Rules.

4.2 Definitions applicable to this Approved procedure are as follows:

COMA – ‘Control, Operation and Maintenance Agreement’ – an agreement which authorises the Company under contract, to operate a Customer’s defined HV and/or LV Systems to facilitate repairs and maintenance on such defined Systems or undertake routine switching operations as requested by the Customer.

Complex Work - where work/testing is to be undertaken on LV Apparatus which meets the criteria as described in Section 13 of this Approved Procedure.

Customer – the organisation who owns/operates the electrical System to be worked on.

Customer Liaison Document - a document, used normally at the pre-work planning stage, to confirm/request/agree, in conjunction with the Customer, key information, which will include, the work to be done, who will control the Danger and authorisation where appropriate to operate the Customer’s switchgear.

Customer’s Senior/Authorised Person – a person appointed by the Customer with the capability and responsibility of undertaking HV switching, isolation and earthing and issue Safety Documents for work or testing on HV Apparatus.




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Non-Complex Work - work on LV Apparatus which normally requires only one point of isolation from known voltage sources and the Arc Flash risk is deemed to be low to ensure safety at the point-of-work as described in Section 13 of this Approved Procedure.

Project Manager – the HaLVE representative who is responsible for:

- liaising with the Customer to determine and agree the work to be carried out

- complete the Customer Liaison Document with the Customer’s nominated representative, collecting and recording all relevant information

- co-ordinate the planning and organising of the project to completion

5. Dangers

5.1 The main Dangers to personnel working on a Customer's electrical installations are electric shock or burns arising from:

Lack of adequate information on the Customer's Installation.

The operation of switching devices that are not in a serviceable and safe condition

Personnel working on wrongly identified Apparatus.

The Apparatus becoming Live whilst work or testing is preceding due to incomplete isolation of all sources of supply.

The possibility of the Apparatus being worked on, or tested, accidentally or inadvertently being made Live.

The possibility, when working on or testing isolated Apparatus, of inadvertent contact with Live conductors within the work or test area.

6. Responsibilities

6.1 All project managers or persons who carry out work or testing on Customer's electrical equipment and Systems have a duty to comply with this Approved Procedure

6.2 It is the responsibility of all Company staff to resist any harassment from the Customer for rapid completion of the work or testing, or to be influenced to attempt to work or to test on an unsafe Systems, Apparatus or equipment

6.3 It is equally important to prevent the Customer attempting to carry out work or testing adjacent to the Company work or test area, when this work or testing may affect the safety of the Company or the Customer’s staff.

6.4 It essential that as part of the pre-work planning process that boundaries of responsibility between various parties are clearly identified, discussed, agreed and recorded.

7. Objections

7.1 When any person receives instructions regarding work on or near, or the operation of any equipment, they Shall report any objections they may have to the carrying out of such instructions to the person issuing them, who will then have the matter investigated and if necessary, refer it to higher authority for a decision before proceeding.

8. Introduction

8.1 There are many non-utility Customers who are not competent to operate, maintain or repair the electrical equipment on their premises who will request the Company, to carry out work on their behalf.

8.2 When work is to carried out on Customers’ electrical systems, then the Company and its staff will bear legal responsibilities under the Health and Safety at Work etc Act 1974 and




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the Electricity at Work Regulations 1989. It is important therefore that the Company and the Customer firstly agree on the safety measures to be taken and that the responsibilities of persons are clearly defined, allocated, understood, accepted and put into effect.

8.3 Working on Customer's equipment and premises may present a number of challenges. The Customer’s installation and environment may be unfamiliar, and the range of equipment may of varying:

Types and manufacture

Age

Standard of maintenance

State of repair

8.4 Often, the Customer's staff may have little electrical knowledge although some may give the impression that they have. They may well, because of a lack of appreciation of electrical safety and the law, and in a desire not to interrupt production, expect Company staff to work in an unsafe manner or in unsuitable, cramped or dangerous places or to take short cuts.

8.5 Often there may be no reliable information of the system to be worked on. Even if there is information available in the form of labels or circuit diagrams, it should not be relied upon unless there is very good reason to be able to do so. In this situation it is imperative that an accurate single line diagram of the network is prepared and the function of all switches established before planning of the work commences.

8.6 To effectively comply with their legal responsibilities, it is essential that staff do not allow themselves to be harassed by the Customer, pressurised to omit stages in the safe preparation or execution of the work, or rely on anything that has not been confirmed to be correct and or safe.

8.7 The normal method of working to be adopted when working on Customer's systems will be in accordance with the HaLVE Electrical Safety Rules.

8.8 The basic principle is that Live working is NOT permitted. The System to be worked on must be Isolated, the points of isolation secured and the System proved safe.

8.9 There should be adequate working space, means of access and egress, and there should be adequate lighting. No electrical terminal or exposed conductor Shall ever be regarded as being Dead, unless it has been proved to be so.

8.10 It is advisable that before any work is carried out on Customer’s Apparatus, that the integrity of the Apparatus to be worked on is established, if necessary by testing. When the work or testing is complete the integrity of the Apparatus after the work or testing is complete can be established and if necessary a comparison can be made.

9. Basic Principles for working on Customers HV or LV Systems

9.1 Work on a Customer’s System Shall be undertaken in one of two ways:

a) Work under the Customer’s Safe System of Work (SSoW), where the Customer’s SSoW has been formally Approved by the Company as being of an equal or better standard than the HaLVE Electrical Safety Rules.

OR

b) Work under the HaLVE Electrical Safety Rules.

9.2 Unless a COMA contract is in place, the procedures for isolation and making Apparatus safe for work, Shall normally be the responsibility of the Customer.

9.3 In situations where the Customer requests the Company to take responsibility for the operation of its HV and/or LV switchgear it Shall be undertaken in accordance with this Approved Procedure.




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10. Stages for the planning and execution of the work

10.1 There will normally be four stages in the planning and execution of the work:

Stage 1 Pre-work planning

Stage 2 Job Organisation

Stage 3 Making safe the Apparatus to be worked on

Stage 4 Execution of the work

AND

Upon successful completion of the work – handing that part of the Customer’s System that has been worked on, back to the Customer to enable him to restore the System to normal.

11. The Planning Stage (Stage 1)

11.1 The ‘Planning Stage’ is an important stage in the process, which will usually determine the overall success of the proposed work and enable the work to be carried out in a safe and efficient way. This stage will determine:

Whose Safety Rules are to be used for the work to be undertaken

Who will control the Danger

Who will operate any switchgear to make safe the Apparatus to be worked on – if this has not already been determined at the quotation stage.

11.2 All aspects of the work Shall be subject to a Risk Assessment (RA) so that Danger is

avoided. The pertinent factors to be established are:

Details of the work to be done

Safety precautions to be taken

Who will be in control of the System

Who will operate the Customers Apparatus

Adequate working space, access and lighting

The existence of generation or alternative energy sources

Customer's Safety & Emergency Procedures

Processes carried out around the workplace

Sufficient knowledge of the Customers System by means of:

– Diagrams

– local knowledge

– history of previous work

Note: Diagrams, labels, etc, must not be relied upon until they have been verified.

11.3 If there is any doubt about the High Voltage state of any equipment, isolation Shall be achieved further up-stream on Isolating Devices which are considered to be safe to operate or at the DNO’s (Distribution Network Operator) supply point. The decision for HaLVE Senior Authorised Person to undertake Live switching will be entirely at his/her discretion. Their decision will be final.

11.4 The process of information gathering at the ‘Planning Stage’ Shall require the completion of a Customer Liaison Document which Shall be used to request and record the key information in order that the job can progress to Stage 2 - ‘Job Organisation’ stage.

11.5 Requests from a Customer for work at short notice (e.g. where production has ceased due to equipment failure) Shall not detract from the need to prepare a detailed Risk Assessment of the complete work activity.




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12. Work on or Testing of Customer’s High Voltage Installations

12.1 Work on Customer’s HV System Shall normally be carried out by the application of the four stages referred to in section 10.1.





12.2 Stage 1 will require the completion of a Customer Liaison Document (HV) which will

provide the mechanism for requesting/acquiring key information as part of the initial information gathering process.

12.3 The key essential Stage 1 information Shall include those items listed on the Customer

Liaison Document. 12.4 The procedure is based on the application of the following principles:

a) Prior to working or testing, the HaLVE Senior Authorised Person Shall be fully familiar with the Customer's HV installation and the extent of the work or testing to be carried out. Work or testing Shall not commence until sufficient information has been gathered to allow the work or testing to proceed safely.

b) A High Voltage Diagram Shall be prepared and Shall detail the Customer's electrical distribution System. The diagram Shall be a true reflection of the System at that time.

c) It Shall clearly be agreed and understood who is in control of the Customer’s System and if control of the System or parts of it, are to be taken over by the HaLVE Senior Authorised Person

d) Switching including earthing Shall normally be carried out by the Customers Authorised Person, unless prior agreement has been reached with the Customer that this will be undertaken by an HaLVE Senior Authorised Person in accordance with a pre-written authorisation under a COMA agreement or consent to operate the Customer’s HV/LV switchgear, obtained via the Customer Liaison Document (HV).

e) Where the HaLVE Senior Authorised Person is to carry out the Switching, this Shall be agreed and planned in advance.

f) Where appropriate, a Circuit State Certificate Shall be used to confirm completion of safety precautions which have been established by the Customer’s Senior Authorised Person.

g) In circumstances where the Customer is unwilling to issue a Circuit State Certificate, then agreement must be reached between the Customer’s Senior Authorised Person and the HaLVE Project Manager at the Planning Stage, for the issue and receipt of a suitable alternative Safety Document in accordance with Section 12.5.

h) The Apparatus to be worked on will be identified and proved Dead at the point of work and Safety Documents Shall be issued, in accordance with the HaLVE Electrical Safety Rules and Approved Procedures.

i) Before work or testing commences in a confined space, cable tunnel or culvert, reference must be made to the Approved Procedure for working in confined spaces, cable tunnels or culverts

j) Make proper use of the Approved tools and equipment, which should be examined before use to ensure their condition and suitability

k) Upon successful completion of the work or testing, the HaLVE Senior Authorised Person Shall ensure that all Safety Documents issued for the work/testing have been




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cleared and cancelled and the Apparatus/System which has been worked on is fit for restoration to service by signing the Clearance section of any Safety Documents issued by the Customer’s Senior Authorised Person to enable him/her to restore the System to normal.

12.5 Completion of the Customer Liaison Document

a) As part of the Stage 1 – ‘Pre-work planning’, the Project Manager Shall meet with an appropriate representative of the Customer and complete the Customer Liaison Document (HV). This will provide the opportunity to:

Record customer details – Customer, Customer Liaison person, work to be done

Acquire the relevant answers to questions 1 -13 on the Customer Liaison Document (HV).

Determine and record persons responsible

Obtain consent (where appropriate) to operate the Customer’s HV/LV switchgear

b) Where the details recorded on the Customer Liaison Document (HV) indicate that conditions exist which will need to be satisfactorily resolved before the job can be safely carried out (Stage 4 – Execution of the work), the Project Manager must ensure that arrangements are made to control or remove the risk

c) Where a situation exists where there are outstanding safety issues which are un-resolved then the job Shall not commence until these issues are satisfactorily resolved.

12.6 Safety Document requirements

a) Whilst this Safety Rules Procedure promotes the use of the Circuit State Certificate as the preferred means of recording and confirming:

The Location

The Apparatus to worked on

The safety measures that have been put in place

The Apparatus has been proved Dead at the point of work

and is the mechanism by which the safety measures will be maintained until the work is complete. It is recognised that the Customer and/or the DNO may be unwilling to issue a Circuit State Certificate. In such circumstances the use of an alternative Safety Document must be agreed between the HaLVE Project Manager and the Customer’s Senior Authorised Person.

b) In situations where the use of an alternative Safety Document is deemed to be necessary the alternative options are:

(i) A Customer’s Permit-to-Work

(ii) A Customer’s Safety Document of a similar format to the HaLVE Circuit State Certificate

c) In agreeing to use an alternative Safety Document it should be borne in mind that if option (a) is used, an HaLVE Permit-to-Work Shall be issued to before work can commence. The recipient of the HaLVE Permit-to-Work Shall be the HaLVE Senior Authorised Person who received the Customer’s Safety Document. The HaLVE Permit-to-Work holder is responsible for supervision of the Working Party and Shall remain on site whilst work is in progress.

d) It should also be borne in mind that the issue of two Permits-to-Work for work on the same Apparatus is not ideal, but may have to be tolerated if an acceptable alternative is not achievable.




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12.7 Customer Liaison Document (HV) format




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13. Work on or Testing of Customers Low Voltage Installations 13.1 Category of work or testing to be undertaken

a) Work on or testing on Customer’s LV Systems will fall into one of the following categories:

(i) Complex Work - where work/testing is to be undertaken on LV Apparatus where:

• There are multiple working parties involved

• There are multiple locations for the same System

• There are multiple means of isolation

• There are multiple energy sources

• Additional Arc Flash protection is required

• The Competent Person in charge of the work decides that the work is complex

• If work is planned to extend beyond one shift the work will be deemed Complex Work.

(ii) Non-Complex Work - work on LV Apparatus which normally requires only one point of isolation from known voltage sources and the Arc Flash risk is deemed to be low, to ensure safety at the point-of-work.

b) The category of work or testing will normally be determined at Stage 1 – Planning, which will then determine how the further three stages will be carried out – Stages 2 – 4.





13.2 Basic requirements for work on or testing of LV Systems

a) The basic principle is that Live working is NOT permitted.

b) The work to be undertaken Shall be categorised as either Complex or Non-Complex.

c) A Customer Liaison Document (LV) Shall be completed for all pre-planned work Complex work.

d) All work or testing activities will be carried out in accordance with Section 5 of the HaLVE High Voltage Safety Rules (Safety Precautions and procedures applicable to Low Voltage Systems).

e) The following principles Shall be applied:

i) Prior to working or testing, staff Shall be fully familiar with the Customer's electrical installation at the location, referring to diagrams/records detailing the Customer's electrical distribution System. All diagrams used Shall be a true reflection of the System at that time.

ii) For all work/testing which is categorised as Complex, switching Shall be carried out by the Customers Authorised Person, unless prior agreement has been reached with the Customer that this will be undertaken by an HaLVE Senior/Authorised Person in accordance with a pre-written authorisation under a COMA agreement or consent to operate the Customer’s HV/LV switchgear, obtained via the Customer Liaison Document (LV). The decision for the HaLVE SAP to undertake Live switching will be entirely at his/her discretion. This decision is final.

iii) Where the work or testing requires HV points of isolation (and earthing where appropriate) to be established, this Shall be carried out in accordance with paragraph (ii) above.




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iv) Before work or testing commences in a confined space, cable tunnel or culvert, reference must be made to the Approved Procedure for working in confined spaces, cable tunnels or culverts.

v) Verification that the Customer's Installation is Isolated, precautions are taken to secure the isolation and Caution Notices are fixed at all points of isolation to a comparable HaLVE standard.

vi) Make proper use of the Approved tools and equipment, which should be examined before use to ensure their condition and suitability.

vii) Where Live conductors are near to the work or test zone, suitable precautions must be taken to avoid Danger from those Conductors.

viii) If work or testing is interrupted, then prior to restarting the work or testing, it must be confirmed that the safety precautions that were in place before the work or testing was interrupted are still in place.

13.3 Planning the Work or Testing and Assessing the Risks

a) Work on Customer’s LV System Shall normally be carried by the application of the four stages referred to in section 13.1.





b) Stage 1 will require the completion of a Customer Liaison Document which will provide the mechanism for requesting/acquiring key information as part of the initial information gathering process.

c) The key essential Stage 1 information Shall include those items listed on the Customer Liaison Document,

d) Before work or testing commences, all aspects of the work or testing Shall be risk assessed to avoid Danger. Many accidents are caused by lack of forethought and proper planning, resulting in the work needing to be rushed, the lack of the proper tools and equipment being available and dangerous situations arising during the course of the work or testing.

e) Requests from a Customer for work or testing at short notice Shall not detract from the need to prepare a detailed plan for that work or testing.

f) Agreement Shall be reached with the Customer's Authorised Person on the full extent of the work or testing to be carried out, and who is responsible for putting safety precautions into effect.

g) The following points Shall be addressed at an early stage so that all parties have a clear and common understanding:

(i) Persons carrying out the work or testing Shall know its full extent and what they are required to do.

(ii) Agreement Shall be reached with the Customer on the safety precautions to be taken and on who will be in control of the System.

(iii) Where possible plans and records Shall be available.

(iv) Persons working on or testing the Installation Shall be suitably authorised to carry out the work or testing which they are to undertake.

(v) Persons working on or testing the Installation Shall have sufficient knowledge and understanding of it to prevent Danger.




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(vi) Persons operating or working on Apparatus Shall be familiar with that Apparatus.

(vii) The existence of any generation or alternative energy sources Shall be established.

(viii) The identification of all points of isolation and the establishment of locking arrangements Shall be made.

(ix) Any specific safety rules or procedures operated by the customer Shall be notified to Persons carrying out work or testing so that those rules etc. can be followed during the period on the Customer's premises.

(x) Action to be taken in the event of fire on the premises Shall be notified to Persons carrying out the work or testing.

(xi) Adequate working space, access and lighting conditions Shall be provided

(xii) Any dangerous process carried out by the Customer in the vicinity of the work or testing Shall be notified to the Persons carrying out the work or testing.

13.4 Completion of the Customer Liaison Document (LV)

a) As part of the Stage 1 – ‘Pre-work planning’, the appointed Project Manager Shall meet (face to face) with a suitable representative of the Customer and complete the Customer Liaison Document (HV). This will provide the opportunity to:

Record customer details – Customer, Customer Liaison person, work to be done

Acquire the relevant answers to questions on the Customer Liaison Document (LV).

Determine and record persons responsible

Obtain consent (where appropriate) to operate the customer’s HV/LV switchgear

b) Where the details recorded on the Customer Liaison Document (LV) indicate that conditions exist which will need to be satisfactorily resolved before the job can safely be carried out (Stage 4 – Execution of the work), the Project Manager must ensure that arrangements are made to do so.

c) Where a situation exists where there are outstanding safety issues which are un-resolved then the job Shall not commence until these issues are satisfactorily resolved.




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13.5 Customer Liaison Document (LV) format




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14. EMERGENCY WORK OR WORK UNDER FAULT CONDITIONS

14.1 General Principles

a) There will be occasions where Company personnel are required to work on installations that are not working for reasons that need to be first ascertained because for example there could be a fault.

b) Under these circumstances equipment may be damaged to such an extent that operations or re-energisation could be dangerous for the operator and to people in the vicinity (or at remote locations). Therefore, before any attempt is made to re-energise the circuit and/or equipment, the Apparatus Shall be fully tested and made safe.

c) Where High Voltage switching is to be carried out by HaLVE personnel, this type of work can only be undertaken by appropriately ‘authorised’ personnel, either a HaLVE Senior Authorised Person or Authorised Person, dependant on the type of System that is being worked on and the requirements of the HaLVE High Voltage Safety Rules.

d) In these circumstances the appropriately authorised person Shall direct and sanction all High Voltage activities under these emergency conditions.

e) The HaLVE Senior Authorised Person or Authorised Person, Shall carry out a risk assessment to identify any hazards and record them and any necessary actions to control or remove them on an appropriate Safety Document.

f) Initially the Senior Authorised Person or Authorised Person Shall make an assessment of the condition of all High Voltage equipment. Consideration Shall be given to the following items:

Types of manufacture

Age

Standard of maintenance

State of repair 14.2 Testing to Prove Status

a) It will be necessary to carry out tests to prove the status of the Apparatus before any work or operations are carried out. Testing Shall be carried out under the requirements for Live working conditions until the Apparatus is proven to be Dead.

b) Once the status of the Apparatus has been ascertained and Isolation has been achieved, work may commence under normal arrangements set out in HaLVE Electrical Safety Rules




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Procedure Title: Procedures when normal Safety Document and Key Procedures cannot be complied with



Contents Page

1. Introduction .................................................................................................. 112 2. Procedure for Clearance and Cancellation of Safety Documents in the absence of the Recipient .............................................................................. 112 3. Procedure for returning Apparatus to Service when a Safety Document and/or Keys are lost ..................................................................................... 112 Appendix 10A – Declaration Form where the following are missing or cannot be accounted for ................................................................................ 114 Recipient Keys Safety Document




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SAFETY RULES PROCEDURES SRP10 - PROCEDURES WHEN NORMAL SAFETY DOCUMENT AND KEY PROCEDURES

CANNOT BE COMPLIED WITH 1. INTRODUCTION

1.1 The following procedures must be adopted when the recipient of a Safety Document is absent or when a Safety Document or Keys have been lost.

1.2 The procedures must only be used after all reasonably practicable steps have been taken to contact the recipient of the Safety Document or retrieve lost Safety Documents and Keys.

2. PROCEDURE FOR CLEARANCE AND CANCELLATION OF SAFETY DOCUMENTS IN

THE ABSENCE OF THE RECIPIENT

2.1 The Senior Authorised Person cancelling the document Shall:

a) Complete the relevant parts of Declaration Form – Appendix 10.

b) Obtain Safety Document and Keys from safe custody.

c) Ascertain that all the work covered by the Safety Document is complete and that all gear, tools, Additional Earths and loose materials have been removed and guards and access doors replaced.

d) Ensure that all persons that have worked under the Safety Document are withdrawn from the Apparatus and informed that the Safety Document is about to be cancelled.

e) Ensure that the Apparatus is in a suitable condition to return to service.

f) The Senior Authorised Person Shall then suitably endorse the clearance section of the Safety Document stating “In the absence of the recipient, I am responsible for clearing this Safety Document”.

g) Carry out the normal cancellation procedure and record all relevant information. 2.2 Following the cancellation of the Safety Document the Senior Authorised Person must

take whatever steps are necessary to contact the recipient, either before or immediately upon their return to site. They must then inform them that the Safety Document is no longer in force and obtain their signature in the clearance section of the Safety Document.

3. PROCEDURE FOR RETURNING APPARATUS TO SERVICE WHEN A SAFETY

DOCUMENT AND/OR KEYS ARE LOST OR CANNOT BE RETRIEVED

3.1 The recipient of the Safety Document and/or Keys must sign a Declaration Form (Appendix 10) stating that if they find the Safety Document and/or Keys they will consider the Safety Document cancelled and return the Safety Document and/or Keys to the Senior Authorised Person.

3.2 In the case of lost Keys, the recipient must give the Senior Authorised Person written permission to obtain the necessary Keys from the Key Safe.

3.3 If the Safety Document is lost, the clearance and cancellation procedures must then be carried out in the normal way using the paper copy of the Safety Document in the Safety Document Book.

3.4 Where the recipient cannot be contacted e.g. due to sickness, in hospital or is away on

holiday the Senior Authorised Person Shall establish the current state of the System and confirm this with the Control Person.




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3.5 The details of the lost Safety Document and Keys Shall be displayed on relevant Notice Boards.

4. PROCEDURE FOR CLEARANCE AND CANCELLATION OF SAFETY DOCUMENTS

WHEN THE SENIOR AUTHORISED PERSON IS UNABLE TO ACCOUNT FOR ALL ADDITIONAL EARTHS ISSUED WITH THE DOCUMENT

4.1 The recipient of the Safety Document Shall sign a Declaration Form (Appendix 10) stating the number of Additional Earths for which they are unable to account for and this must be fixed to the Safety Document.

4.2 The Senior Authorised Person Shall ensure that all Additional Earths have been removed from the Apparatus

4.3 When the Senior Authorised Person is certain that the Apparatus is free of any Additional Earths they must cancel the Safety Document using the normal procedure.

4.4 The Senior Authorised Person Shall determine the numbers of the Additional Earths unaccounted for and display the information on relevant Notice Boards.




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APPENDIX 10A PROCEDURES TO BE ADOPTED WHEN NORMAL SAFETY DOCUMENT AND KEY PROCEDURES CANNOT BE APPLIED

DECLARATION FORM

Type of Safety Document concerned: ........................................................ No: ...........

1 The Lost or Missing Items (tick as appropriate)

( ) SAFETY DOCUMENT

( ) RECIPIENT OF SAFETY DOCUMENT

( ) KEY SAFE KEY

I acknowledge that the ticked item(s) above are either lost or missing.

Signed: .......................……….........Time: ...................... Date: ..........................

2 Clearance of Safety Document

I certify that all Persons working/testing under the Safety Document detailed above have been withdrawn from and warned not to continue working/testing on the Apparatus in Section 1 of the Safety Document. All gear, tools, and equipment used in the work/test activities have been removed and access covers/plates have been replaced and the condition of the System is as received except for: -

…………………………………………………………………………………………

…………………………………………………………………………………………

Signed: ..............................………....... Time: ...................... Date: .................

(being the Person responsible for clearing the Safety Document)

3 Confirmation of Actions Taken

I confirm that the above actions have been carried out.

Signed ..............................………Time: ...................... Date: .......................... (being a Senior Authorised Person)




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Procedure Title: Excavations and Safe digging



Contents Page 1. Definitions .......................................................................................................... 116 2. Purpose ............................................................................................................. 116 3. Scope ................................................................................................................. 116 4. Dangers ............................................................................................................. 116 5. General Safety Precautions ............................................................................... 116 6. Cables laid in concrete cable trenches within substations .................................. 117




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SRP11 – EXCAVATIONS AND SAFETY DIGGING 1. DEFINITIONS

Terms printed in bold type are defined in the Operational Safety Rules. 2. PURPOSE

To ensure that all excavations and digging to locate and expose High Voltage, Low Voltage and auxiliary cables used for protection, control, telemetry or communication are completed safely, with correct equipment and PPE and is in accordance with the Company’s safety management system and relevant legislation.

3. SCOPE

• All excavations in the vicinity of buried cables, cables laid in concrete cable trenches and cables rising from the ground to above ground terminations

• All excavations carried out to locate buried cables in order that work may be carried out 4. DANGERS

The main Dangers to personnel undertaking excavations to locate and work on buried cables are electric shock and burns arising from: -

a) Physically damaging existing in-service cables resulting in the short circuiting of Conductors

b) The proximity of exposed Live Apparatus, other cables or services

c) The physical conditions in the vicinity of the point of work due to deep excavations

d) The sudden release of gas from pressurised cables

5. GENERAL SAFETY PRECAUTIONS

5.1 Reference must be made to records of the cable(s) and other services and use made of Approved specialised detection instruments to determine the position of the required cable(s) and other cables and services in order to safely excavate at the appropriate position. Allowance should be made for the possibility of errors or inaccuracies in the records, of changes in local geography that have not been recorded and for the possibility of movement of the cable(s) by others.

5.2 Care should be taken in deciding the extent to which mechanical means of excavation may be used, in order to avoid Danger from, or damage to, cables or other services. Careful hand excavation is preferable to mechanical excavation. When excavating in close proximity to a cable, consideration should be given to the type of tools being used. Spades and shovels should be used rather than other tools where necessary to avoid damage to, and subsequent Danger from, any services.

5.3 When carrying out excavations for this purpose a Limited Work Certificate may be issued at the discretion of a Senior Authorised Person.

5.4 If cable tiles or other cable markers, or protectors are exposed during excavation, it should

not be assumed that they are in their correct position directly above the cable(s) they were originally intended to protect. Previous excavations and careless backfilling may have




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misplaced such cable markers or protectors. The position of a cable is not certain until it is uncovered and identified.

5.5 As excavations progress, precautions should be taken to prevent collapse of the trench or hole by shuttering or similar means. Should the depth of the excavation or the nature and the contour of land by the excavation be such that a fall might bury or strike and injure anyone near or in the vicinity of the trench, the excavation and surrounding parts must be suitably supported. Attention should be given to supporting excavations in the vicinity of walls, particularly retaining walls, where a landslip, whether it is initiated by the digging of a trench or not, may cause Danger. Such support should be inspected regularly and, if the trench is more than 2 metres deep, it must be inspected daily by the Person in charge of the work. Any defect found at any time must be rectified immediately.

5.6 As work progresses, the work area must be defined and precautions taken to adequately sign, fence, guard and illuminate the area as necessary so as to give proper warning of the excavation to employees, the walking public, road users and other persons.

5.7 The excavation should be made large enough to expose all the cables, pipes and ducts necessary to establish the position of the required cable(s).

5.8 Reference should also be made to Health and Safety Executive Publication HS(G)47 'Avoiding Danger from Underground Services', when excavating to expose cables.

5.9 The Company's Safe Digging Procedure will be used at all times and Personal Protective Equipment Shall be used as required.

6. CABLES LAID IN CONCRETE CABLE TRENCHES WITHIN SUBSTATIONS

6.1 Where cables are laid in purpose made concrete cable trenches within substations/switching stations care must be taken to ensure that cables are not damaged due to:

(a) Cable trench covers collapsing whilst persons or mechanical equipment passing over the cable trench

(b) Cable trench covers being accidentally dropped onto cables

(c) Tools, equipment or heavy materials being dropped onto cables whilst the trench covers are removed.

6.2 Access to cables laid in such cable trenches shall be undertaken with great care to ensure

that cables are not damaged. Damage occurring to High Voltage and Low Voltage power cables can result in:

(a) Short circuiting of High Voltage or Low Voltage Conductors with the consequence of serious burns or explosion

(b) The release of gas or oil under pressure in the case of pressurised High Voltage cables

(c) The mal-operation of protective devices due to damage of cables used for power system protection

(d) The loss or interference to communication circuits affecting SCADA of telecommunication systems

6.3 The use of barriers to protect open trenches should be considered as part of the Risk

Assessment process prior to and during the process of removing trench covers to gain access to cables.




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Procedure Title: Authorisation Procedures



Contents Page 1. Scope ............................................................................................................... 120 2. General Requirements ..................................................................................... 120 3. Requirements to achieve Authorisation ............................................................ 120 4. Authorising Panel ............................................................................................. 121 5. Refresher Training/Re-assessment .................................................................. 121 6. Suspension / Removal of Authorisation ............................................................ 122 7. Authorisation Categories .................................................................................. 122




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SRP12 - AUTHORISATION PROCEDURES

1. SCOPE

1.1 This document details the procedures that HaLVE Shall use when appointing personnel to access, operate and work on High Voltage and Low Voltage Systems.

2. GENERAL REQUIREMENTS

2.1 It is the duty of all Persons who are responsible for the implementation of HaLVE HV Safety Rules to comply with them and the associated Safety Rules Procedures. Ignorance of them, as ignorance of relevant legal requirements, Shall not be accepted as an excuse for neglect of duty

2.2 To ensure all Persons are competent to carry out their duties safely and in compliance with HaLVE HV Safety Rules and Safety Rules Procedures, and to ensure legal requirements are met, the Company Shall ensure all Persons who are to work and operate on electrical systems are as follows:

(a) Trained

(b) Experienced

(c) Assessed

(d) Supervised

2.3 A written Authorisation Certificate Shall be given to each Person to indicate that they have proven they are able to perform their designated role in implementing the Safety Rules.

2.4 The Authorisation Certificate Shall indicate the class of operation and/or work permitted and the section of the System to which the authorisation applies.

2.5 Authorisation to undertake operational duties set out in the HaLVE HV Safety Rules are not transferable to other organisations or companies when Persons leave the Company’s employment.

2.6 The following provisions Shall be met before an appropriate Authorisation Certificate is issued.

3. REQUIREMENTS TO ACHIEVE AUTHORISATION

3.1 Persons being considered for an authorisation level Shall have all the following:

(a) Sufficient experience of the work to be undertaken

(b) The successful completion of a recognised training course/academic qualification in that type of work

(c) Satisfied an Assessment process of their competence. This assessment Shall be conducted within 20 working days of attendance at the appropriate course.

3.2 Persons being considered for authorisation as Authorised Persons (HV), Shall additionally

meet the following two requirements.

(a) Have attended a recognised Switching operations course (minimum 3 days)




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(b) Have carried out 10 High Voltage Switching operations (including a minimum of 6 isolations for work, where applicable) under the Personal Supervision of a Senior Authorised Person (SAP).

3.6 Persons being considered for authorisation as Senior Authorised Person Shall

additionally meet the following two requirements.

(a) Have attended a recognised SAP course (5 days) or an Authorised Person to Senior Authorised Person bridging course (minimum 3 days)

(b) Have issued 10 (minimum) Safety Documents for work on HV Systems or High Voltage testing under the Personal Supervision of an SAP.

3.7 Where Persons requiring authorisation under the HaLVE HV Safety Rules hold existing

authorisations or have previously held authorisations issued by other organisations, they Shall be assessed against a standard assessment criteria appropriate to the duties and responsibilities associated with the authorisation category sought. The Authorisation assessment Shall take into account existing and previous competencies and experience supported by verifiable evidence and will be based on the requirements above.

4. AUTHORISATION ASSESSMENTS

4.1 The authorisation process Shall be conducted by an Assessing Officer appointed by the Company to undertake operational assessments. The Assessing Officer will normally be assisted by at least one additional Person who holds an authorisation category of at least one level higher than the category being sought, except for Senior Authorised Persons where this Person will have this status. Following successful completion of the assessment, the Assessing Officer will recommend the candidate to the Company’s Authorising Officer as being suitable for the authorisation category being sought.

4.2 The Assessing Officer is responsible for confirming that, based on the results of the

assessment process and evidence presented by the candidate, has demonstrated a satisfactory level of knowledge, skill and competence, relevant to the category of authorisation being sought.

4.3 Proof of the candidate’s ability to meet these requirements will be assessed by means of

some or all of the following (dependant of the assessment criteria):

(a) Provision of evidence that the appropriate number of Switching operations and, where appropriate, the issue of Safety Documents has been carried out.

(b) Technical questions on appropriate procedures and HaLVE HV Safety Rules.

(c) Desk-top exercises which replicate the types of work that Shall be undertaken with the new level of Authorisation.

(d) A Switching test which Shall include all the major tasks envisaged for the type of work.

4.4 The assessment for Authorised and Senior Authorised Persons will usually take approx. ½ day to fully explore the required range of competencies.

5. REFRESHER TRAINING

5.1 Each Authorised Person and Senior Authorised Person Shall undergo a 3-day refresher course every three years.

5.2 Competent Persons Shall receive a 1-day refresher course every 5 years.




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5.3 Persons attending a refresher course Shall be expected to pass the end of course assessment.

6. SUSPENSION / REMOVAL OF AUTHORISATION

6.1 The Authorisation panel may suspend any issued Authorisation at any time. Authorisation Shall be immediately suspended under the following circumstances:

• A Switching operation where the switchgear has failed, putting the operator at risk

• An erroneous operation (e.g. intended to carry out ‘On’ to ‘Off’ operation, but actually carried out an Earthing operation, etc.)

• Non-compliance with HaLVE HV Electrical Safety Rules and/or Safety Rules Procedures

6.2 Restoration of a suspended Authorisation Shall be the responsibility of an Assessment

panel, chaired by an Assessing Officer, who Shall consider all the factors that lead to the suspension. Though the panel may choose to immediately restore the authorisation they have many more options at their disposal. For instance, further training, onsite monitoring, reducing the authorisation level or permanent removal of all authorisation levels, etc.

7. AUTHORISATION CATEGORIES

Persons authorised for duties under the Safety Rules Shall be authorised under the following categories:

COMPETENT PERSON DUTIES

Carry out the following on HV and LV systems under the operational control of HaLVE HV:

CP1 Independent entry to Substations with no exposed Live conductors

CP2 Carry out non-electrical work in Substations/Switchrooms when in receipt of a Limitation-of-Access

CP3 Carry out work on HV or LV Apparatus when in receipt of a Permit-to-Work or Limitation-of-Access and supervise the Working Party

AUTHORISED PERSON DUTIES

Carry out the following on HV and LV systems under the operational control of HaLVE:

AP1 Undertake switching operations on HV and LV systems up to and including 11kV

AP2 Establish points of isolation on HV and LV systems up to and including 11kV

SENIOR AUTHORISED PERSON

Carry out the following on HV and LV systems under the operational control of HaLVE:

SAP1

Apply Circuit Main Earths to HV systems up to and including 11kV

Issue and Cancel Permit-to-Work and Sanction-for-Test safety documents for work/testing on HV Apparatus

SAP2 Carry out the role of Control Person responsible for controlling and co-ordinating safety activities necessary to achieve safety from a System, where safety measures are established on HV Systems.