transmission capital services (tcs) electrical … · appendix 5 – certificate for live lv...

Transmission Capital Services Ltd

Two London Bridge E-mail: [email protected]

London SE1 9RA Web: www.transmissioncapital.com

Transmission Capital Services (TCS) Electrical Safety Rules

SHEQ/HS/TCSESR/001-2.2

DOCUMENT AUTHORISATION SHEET

Version 2.2

Report Date 22/08/2014

Revised by:

Name: David White

Position: Senior Asset Manager

Date: 17/10/2014

Reviewed by:

Name: Keith Stonham

Position: Technical Consultant to TCS

Date: 17/10/2014

Authorised by:

Name: Mike Lee

Position: Head of Asset Management

Date: 17/10/2014

Version No. Date Comment Author Reviewed Authorised

A 14/05/12 LB

B 02/11/12 LB

C 10/02/2013 LB DO/BM ML

1.0 19/07/2013 Amendment to Section 3.2.1 (Para 1) to include conductive equipment connected to Live HV Conductors as forming Safety Distance ‘X’ dis-tance.

LB BM ML

2.0 22/08/2014 Review and Amendments DW BM ML

2.1 17/10/14 New LV section and minor amendments DW KS ML

2.2 21/10/14 Responsibilities section amended DW ML ML

mailto:office@[email protected]

http://www.transmissioncapital.com/


Transmission Capital Services PAGE 2

UNCONTROLLED WHEN PRINTED Review Date 31st Oct 2015 No part of this publication may be reproduced without the written

permission of Transmission Capital Services Ltd

Contents

1 ABBREVIATIONS........................................................................................................................... 3

2 PRELIMINARY ............................................................................................................................... 4 2.1 Introduction ........................................................................................................................................ 4 2.3 Definitions .......................................................................................................................................... 5 2.4 Specific Interpretations ....................................................................................................................... 9 2.5 Philosophy .......................................................................................................................................... 9 2.6 Principles .......................................................................................................................................... 10 2.7 Application of the Electrical Safety Rules ....................................................................................... 11 2.8 General Requirements ...................................................................................................................... 11 2.9 General Safety .................................................................................................................................. 12 2.10 Objections on Safety Grounds .......................................................................................................... 12 2.11 Exceptional Circumstances .............................................................................................................. 12

3 BASIC SAFETY RULES ............................................................................................................... 12 3.1 Putting New Equipment into Service ............................................................................................... 12 3.2 Approach to Exposed High Voltage Conductors / Insulators ........................................................... 12

3.2.1 Safety Distances ....................................................................................................................... 13 3.3 Safety Precautions for Work on or adjacent to High Voltage Equipment ........................................ 14 3.4 General Safety Precautions and Procedures Applicable to Low Voltage Systems .......................... 15 3.5 General Requirements for Working on Dead Low Voltage Equipment and Conductors ................ 16 3.6 Additional Precautions for Working on Dead Low Voltage Cables ................................................ 16 3.7 Work on or Testing of Live Low Voltage Equipment and Conductors ........................................... 16 3.8 Identification of Equipment .............................................................................................................. 17 3.9 Demarcation of Work Areas in Substations ..................................................................................... 17 3.10 Movement and Use of Vehicles, Ladders and Other Long Objects ................................................. 17 3.11 Automatic/Remotely Controlled Equipment .................................................................................... 17 3.12 Switching Operations ....................................................................................................................... 17

4 SAFETY DOCUMENTS PROCEDURES ................................................................................... 18 4.1 General ............................................................................................................................................. 18 4.2 Application ....................................................................................................................................... 18 4.3 Application of Safety Precautions .................................................................................................... 19 4.4 Preparation of Safety Documents ..................................................................................................... 19 4.5 Issue of Safety Documents ............................................................................................................... 20 4.6 Receipt of Safety Documents ........................................................................................................... 20 4.7 Clearance and Cancellation of a Safety Document .......................................................................... 21 4.8 Lost Safety Document / Key Procedure ........................................................................................... 21

5 RESPONSIBILITIES OF INDIVIDUALS APPOINTED UNDER THE ELECTRICAL

SAFETY RULES ......................................................................................................................................... 21 5.1 General ............................................................................................................................................. 21 5.2 Categories of Authorisation .............................................................................................................. 22 5.3 Competent Person Responsibilities .................................................................................................. 22 5.4 Authorised Person Responsibilities .................................................................................................. 23 5.5 Senior Authorised Person Responsibilities....................................................................................... 23 5.6 Control Person Responsibilities ....................................................................................................... 23

6 Notes ................................................................................................................................................ 25





Appendices

Appendix 1 – Permit to Work (PTW)

Appendix 2 – Sanction for Test (SFT)

Appendix 3 – Limitation of Access (LOA)

Appendix 4 – LV / Mechanical Permit to Work

Appendix 5 – Certificate for Live LV Working (CLLVW)

Appendix 6 – HV System Change Certificate (HVSCC)

Appendix 7 – Switching Schedule Pro-forma Appendix 8 - Record of Inter System Safety Precautions (RISSP) Appendix 9 - Working Party Register

1 ABBREVIATIONS

Al Aluminium (Periodic Table)

CB Circuit Breaker

CSE Cable Sealing Ends

CT Current Transformer

Cu Copper (Periodic Table)

CVT Capacitor Voltage Transformer

HAM High Accuracy Metering (Combined CT and VT)

OFTO Offshore Transmission System Owner

SA Surge Arrestor

SAP Senior Authorised Person

SCADA System Control and Data Acquisition

TCS Transmission Capital Services

VT Voltage Transformers





2 PRELIMINARY

2.1 Introduction

1. The Electrical Safety Rules are provided to ensure that work can be undertaken safely on or near to items of Equipment that form part of the Transmission System owned by a Transmission Capital OFTO and managed by Transmission Capital Services.

2. They are designed to ensure that any individual working on Equipment to which the Elec-trical Safety Rules apply is safeguarded from the inherent hazards arising from the electrical System.

3. The Electrical Safety Rules are mandatory. Every individual concerned with work on the System has a duty to make themselves familiar with the requirements for compliance with the project Safe System of Work. All individuals also have a duty to be conversant with and to observe statutory requirements relating to any activity with which they are involved.

4. The Health and Safety at Work etc. Act 1974 and Regulations made under it, place a duty on all employers and individuals employed to take reasonable care for the health and safety of themselves and others who may foreseeably be affected by their acts or omissions.

5. If, whether intentionally or through neglect or carelessness, an individual either fails to ob-serve the Electrical Safety Rules, or unnecessarily endangers the personal safety of either themselves or others, the individual will be liable to disciplinary action and render him or herself liable to prosecution.

6. These Electrical Safety Rules are supported by:

a. The Electricity at Work Regulations 1989

b. Memorandum of Guidance on the Electricity at Work Regulations 1989

c. The TCS Electrical Safety Rules Approved Supporting Procedures





2.3 Definitions

Term Definition

Approved

A written procedure sanctioned in writing by the Company

Tools and equipment sanctioned in writing by the Company

Authorisation Officer

An individual who has been appointed in writing by a Director of the Company to recommend authorisation of an Authorised Person, Senior Authorised Per-son or Control Person under the Electrical Safety Rules

Authorised Person A Person who has been appointed by the Company to carry out operational and safety switching duties as specified in writing.

Caution Notice

A notice in Approved form conveying a warning against interference, which shall be attached at all Points of Isolation. “CAUTION – DO NOT INTERFERE WITH THIS EQUIPMENT”

Certificate for Live LV Work-ing (CLLVW)

A Safety Document as shown in these Electrical Safety Rules, specifying the LV Equipment, the work which is to be carried out Live and the precautions to be taken to achieve a safe system of work.

Charged At a voltage when Isolated from the System by induc-tion or a retained charge due to capacitive effects.

Circuit Identification Colours or symbols used to identify circuits and other Equipment.

(The) Company Transmission Capital Services (TCS)

Competent Person

A Person who has been appointed by a Senior Au-thorised Person or Authorisation Officer as having sufficient technical knowledge and/or experience to enable them to avoid Danger and who may be nomi-nated to carry out duties specified in writing including the receipt and clearance of Safety Documents.

Consent

Confirmation by the Control Person before com-mencement of a Switching Schedule or the issue of a Safety Document that safety precautions have been carried out on the correct Equipment and that proce-dures have been put in place to maintain these until the Safety Document is cancelled.

Control Person

A Person who has been appointed by the Company to be responsible for controlling and co-ordinating safety activities necessary to achieve Safety from the System within and across defined boundaries.

Control Room Facilities for operational control of the System

Danger A risk to health or bodily injury.

Danger Notice A notice in Approved form used during works indicat-ing that equipment is Live. “DANGER-LIVE EQUIP-MENT”

Dead Not electrically Live or Charged.

Discharge Device An Approved device for discharging the remaining





Term Definition

voltage of Charged Equipment.

Earth The conductive mass of earth, whose electrical poten-tial at any point is conventionally taken as zero.

Earthed Connected to earth by means of an Earthing Device.

Earthing Device

A means of providing a connection between an electri-cal conductor and earth.

Primary Earth - An Approved fixed or portable Earthing Device applied to an electrical conductor to protect against inadvertent energisation. Ap-plied before the issue of, and at a position rec-orded in, a Safety Document.

Drain Earth – An Approved fixed or portable Earthing Device applied to electrical equipment for the purpose of protection against induced volt-ages and Charged Equipment and management of circulating currents. Applied after the issue of a Safety Document.

Earthing Schedule A schedule indicating the Drain Earth requirements for each stage of work.

Equipment Electrical or mechanical plant, apparatus, equipment and components of the System to which the Electrical Safety Rules apply

Equipment Identification The Nomenclature, name or code used to specifically identify the equipment to be operated or worked on

General Safety

The provision and maintenance of safe access to and from the place of work, a safe place of work, a safe working environment, safe systems of work and the correct use of personal protective equipment which are not covered by theses Electrical Safety Rules.

Grid Code

Permits the development, maintenance and operation of an efficient, co-ordinated and economical system for the transmission of electricity. National Grid and users of its transmission system are required to comply with the Grid Code.

High Voltage (HV) A voltage >1000 Volts

HV System Change Certifi-cate. (HVSCC)

A certificate used to notify contractors, TCS Staff, and NETSO when adding Plant or removing Equipment to/from the System, and changes in name or Nomen-clature for existing circuits or Equipment. On the completion of Part 6 the changes defined in Part 3 become effective. The Control Person’s copy of the document shall have printed names in Part 6, backed up with logged statements.

Isolated

Disconnected from associated Equipment by the op-eration of an Isolating Device to the isolating position or by physical separation which shall ensure the isola-tion gap cannot fail electrically.

Isolating Device A device for rendering Equipment Isolated.

Keys Control Key - a key for operating the control lock

of a Key Safe.





Term Definition

Safety Key - a key unique at the Location for locking an Isolation Device or Earthing Device.

Key Safe Key - a key unique at the Location for operating a lock, other than the control lock, on a Key Safe.

Key Safe A lockable device for the secure retention of Keys, links and fuses.

Limitation of Access (LOA)

A Safety Document as shown in these Electrical Safety Rules, specifying the Equipment, the work to be carried out, the limits of the work and/or work area necessary to achieve Safety from the System when verbal instructions are not considered sufficient for that purpose, and where a Permit-to-Work or Sanction-for-Test is not applicable.

Live At a voltage by being connected to a source of elec-tricity.

Location Any place at which work is carried out under the Transmission Capital Systems (TCS) Electrical Safety Rules.

Locked A condition of Equipment that cannot be altered with-out the operation of a secure fastening device.

Low Voltage (LV) A voltage up to and including 1000 Volts

LV or Mechanical Permit to Work (LVPTW / MPTW)

A Safety Document as shown in these Electrical Safety Rules, specifying the LV or Mechanical Equip-ment, the work which is to be carried out, the limits of the work and actions taken to achieve Safety from the System.

Method Statement

A logical sequence of exactly how a job is to be carried out in a safe manner and without risks to health. It in-cludes all the risks identified in the Risk Assessment and the measures needed to control those risks.

NETSO National Electricity Transmission System Operator

Nomenclature The Approved numbering system used to allocate unique name, number and code identifying to HV Equipment on the Company’s Transmission System.

Operational Service In service, under the operational control of the Control Person.

Permit to Work (PTW)

A Safety Document as shown in these Electrical Safety Rules, specifying the Equipment, the work to be carried out and the limits of the work and the ac-tions taken to achieve Safety from the System.

Person An individual recognised by The Company as having sufficient technical knowledge and/or experience to avoid Danger.

Plant Electrical and/or Mechanical items, which are not part of the System and disconnected from the System (i.e. not Equipment).

Point(s) of Isolation The point at which Equipment has been Isolated and where reasonably practicable Locked. Caution no-tices shall be attached at all Points of Isolation.

Risk Assessment As required by Regulation 3 of the Management of





Term Definition

Health and Safety at Work Regulations 1999

Record of Inter System Safety Precautions (RISSP)

A document conforming to OC8 of the Grid Code specifying the location of Isolation and/or Earthing points across System boundaries using different Safety Rules

Safe Custody To keep items dry and legible and ensure they cannot be lost or interfered with.

Safety Distance

The distance from the nearest High Voltage exposed conductor, or from an insulator supporting a High Voltage conductor, which shall be maintained to avoid Danger.

Safety Documents

Permit to Work (PTW), Sanction for Test (SFT), Limitation of Access (LOA), LV / Mechanical Permit to Work (LVPTW / MPTW) and Certificate for Live LV Work (CLLVW) are the Safety Documents used to control the work carried out on the System.

Safety Document Continua-tion Sheet

A continuation sheet used where space is inadequate on a Safety Document to record all necessary details.

Safety from the System That condition which safeguards individuals working on or near to Equipment from the Dangers, which are inherent in a System.

Sanction for Test (SFT)

A Safety Document as detailed in these Electrical Safety Rules, specifying the Equipment, and the test-ing/work to be carried out that may require the removal of Primary Earths and the actions taken to achieve Safety from the System.

Senior Authorised Person (SAP)

An Authorised Person who has been appointed by the Company to carry out duties specified in writing in-cluding the preparation, issue and cancellation of Safety Documents.

Site Responsibility Schedule (SRS)

The document specific to the site defining the bound-ary point of ownership, control and Safety Rules under which the Plant, Equipment, Apparatus, Structures, and associated Auxiliaries are managed.

System Operator Transmis-sion Operator Code (STC)

Defines the high-level relationship between the Na-tional Electricity Transmission System Operator (NETSO) and Transmission System Owner

Supervision

Local Supervision: Supervision by an individual, suitably authorised for the activity being supervised, who is continuously available at the Location where work is in progress and is able to attend the point of work as necessary to ensure the safe performance of the work. Personal Supervision: Supervision by an individual, suitably authorised for the activity being supervised, continually observing and in the presence of the individual(s) carrying out the work, with the ability to directly intervene, to ensure that individual(s) are not exposed to Danger.

Switching The operation of circuit breakers, isolators, disconnect-ors, fuses or other methods of making or breaking an electrical circuit and/or the application and removal of





Term Definition

Primary Earths.

Switching Schedule

A schedule of the Switching operations required to ensure that equipment is Isolated, Earthed, Locked and Point(s) of Isolation applied prior to the issue of a Permit to Work or Sanction For Test and the steps required to return the Equipment to service.

System Items of Equipment used separately or in combination for the generation, transmission and distribution of electricity.

Transmission Capital Ser-vices (TCS)

The Asset Managers for the OFTO projects owned by the OFTO

Transmission Capital OFTO Transmission Capital Offshore Transmission System Operator (OFTO); the owner of System and assets

Vented Having an outlet to the atmosphere so that pressure is equalised to atmospheric pressure.

Working Party

Individuals working under the Personal Supervision of a Competent Person or Persons working under the Local Supervision of a Competent Person, including a Competent Person or Person working alone.

Working Party Register Register containing the name of each individual work-ing on the System. Each individual must sign on and off of the register each day, recording the time.

2.4 Specific Interpretations

1. Shall

When “shall” is used in these Electrical Safety Rules with no qualification, this indicates a mandatory requirement. No discretion is permitted and no judgement can be made.

2. Shall where practicable

When “shall where practicable” is used to qualify a requirement, a slightly less strict stand-ard is imposed. It means that where possible to achieve, in the light of current knowledge and invention, then the requirement shall be met. To avoid the requirement on the grounds of difficulty, inconvenience or cost is not allowed.

3. Shall where reasonably practicable

When “shall where reasonably practicable” is used to qualify a requirement, then a judge-ment shall be made as to what is reasonable. This shall take into account an assessment of the magnitude of the risk on the one hand and the cost, time, trouble and effort necessary for averting the risk on the other hand.

2.5 Philosophy

1. Electrical and Mechanical items of Equipment are interconnected to form the System. The System contains inherent Dangers but has been designed so that when operated normally it is safe.





2. When work is to be carried out on, or near to, the System, Electrical Safety Rules need to be specified to achieve safety from the inherent Dangers.

3. These Electrical Safety Rules are based on a philosophy that individuals will be protected from the inherent Dangers. This is achieved by making them “Safe from the System”.

4. The inherent Dangers are those arising from the System. The Electrical Safety Rules de-fine procedures and responsibilities for achieving safety of individuals from the inherent Dangers. They may be summarised as follows:

a. Making available the Equipment concerned for the work required.

b. Establishing safe conditions for work. This can be achieved by limiting the scope of the work, or Isolation and Earthing from the System.

c. Authorising the commencement of work.

d. Receiving the authority to commence work, executing the work, supervising safety during the work and clearing the authority when the work is terminated.

e. Cancelling the authority on termination of work.

f. Restoring the System to normal.

5. Further Dangers are those arising from the environment in which individuals undertake work. The way in which these Dangers are managed shall be specified in Approved Pro-cedures.

2.6 Principles

1. To fulfil the requirements of the philosophy, the following principles have been adopted in formulating the Electrical Safety Rules:

a. The Electrical Safety Rules are concerned only with achieving safety for individuals.

b. When work is to be carried out on High Voltage Equipment, the primary means of achieving Safety from the System is by Isolation, followed by Earthing. Where rea-sonably practicable the Isolating Devices and Earthing Devices shall be Locked.

c. In the case of Low Voltage Equipment, the primary means of achieving safety from the System is by Isolation. If Isolation is not reasonably practicable, safety is achieved by the application of Approved procedures.

d. The fundamental means of protecting individuals at work is the application and maintenance of the primary means of achieving Safety from the System as speci-fied in 1 (b) and (c) supported by appropriate actions to maintain the effectiveness of the primary means, e.g. locking off Isolating Devices.

e. Safety from the System, will be achieved by one or more of the following functions:

i. Control – identify the work to be carried out and the precautions to be taken. This will include the preparation of Switching Schedules and the identifica-tion of additional safety procedures to be followed.





ii. Making Safe/Restoration of Equipment - before work commences, make Equipment safe for work and issue a Safety Document. After the comple-tion of work, cancel the Safety Document(s) and restore the Equipment to service.

iii. Work - receipt of a Safety Document, execution of the required work to its completion or termination and, after the work area has been cleared, clear-ance of the Safety Document.

The above three functions cover separate responsibilities, which are distinct from each other and are treated separately in the Electrical Safety Rules.

2. For a specific task, a Senior Authorised Person may prepare Equipment to his own in-structions, by use of a Switching Schedule, issue a Safety Document to himself, execute the work, clear and cancel the Safety Document and return the Equipment to service. Consent to proceed shall be obtained from a Control Person, who shall where reasonably practicable be a separate individual

2.7 Application of the Electrical Safety Rules

1. The Electrical Safety Rules shall be applied to all electrical Equipment managed by the Company and defined in the Site Responsibility Schedule.

2. Equipment shall be added to, and removed from, the System only in accordance with an Approved procedure, accompanied by a HV System Change Certificate (HVSCC), which will determine the point in time when the Electrical Safety Rules are to be applied to new Equipment, and cease to apply to Equipment removed from the System.

The Approved procedure may include provision for Equipment temporarily disconnected and removed from the normal service position to workshops or work area. The Equipment is to be considered as temporarily removed from the System.

Account and due regard must be given to compliance with Grid Code and System Opera-tor Transmission Operator Code (STC) procedures as appropriate for addition/removal of Equipment from the System.

3. When a cross-boundary isolation is required the Control Person or Senior Authorised Person shall ensure Safety from the System by use of a RISSP in accordance with Grid Code OC8 and the Company Approved Procedure.

2.8 General Requirements

1. All individuals with responsibilities under the Electrical Safety Rules must possess sufficient knowledge and/or experience to avoid Danger. They must have received training for the roles they are to perform under the Electrical Safety Rules.





2. If a hazard arises or is suspected during the course of work, which could give rise to Dan-ger, the work shall cease, the situation shall be reported immediately to a Senior Author-ised Person or Control Person and all individuals withdrawn from the Equipment and immediate Location concerned.

3. In addition to the Electrical Safety Rules, other associated documents used in conjunction with the Electrical Safety Rules issued by the Company or other authorities and the re-quirements of supporting mandatory documents must be complied with.

2.9 General Safety

1. In addition to the requirements for establishing Safety from the System specified in these Electrical Safety Rules, General Safety must be established and maintained at all times, in accordance with the Management of Health and Safety at Work Regulations and Company Policy. During the course of the work the Competent Person in charge of a Working Party shall ensure that all members of a Working Party maintain General Safety and ensure that other work areas are not adversely affected by their activities.

In addition, Persons are also responsible for the General Safety of themselves and others in accordance with the Health and Safety at Work etc. Act 1974.

2. The discharging of responsibility for General Safety will be achieved as part of the normal pattern of management delegation and control by ensuring that all activities are in accord-ance with appropriate instructions and guidance, and activities are supported by appropri-ate Risk Assessments and Method Statements.

2.10 Objections on Safety Grounds

1. Anyone who has objections on safety grounds in the application of the Electrical Safety Rules shall explain their reasons to the individual giving the instructions. Any such objec-tions shall be dealt with by the Senior Authorised Person, or the Control Person or cas-caded upwards within the Company.

2.11 Exceptional Circumstances

1. All work on Equipment which is part of the System and to which these Electrical Safety Rules cannot be applied, or for special reasons should not be applied, shall be carried out in accordance with Approved Procedures supported by appropriate Risk Assessments.

3 BASIC SAFETY RULES

3.1 Putting New Equipment into Service

1. A HV System Change Certificate shall be issued in accordance with TCS ESR Supporting procedure 12 (SRSP12) – “HV System Change Certificate” to transfer any item of Equip-ment to control under the Electrical Safety Rules.

3.2 Approach to Exposed High Voltage Conductors / Insulators





1. Access to any Equipment containing exposed High Voltage conductors shall be controlled by a Senior Authorised Person using an Approved procedure

3.2.1 Safety Distances

1. The Safety Distances (designated 'X' in Table 3.2.1 and Figure 3.2.1 below) shall be main-tained at the respective System voltages between any part of the individual or object and the nearest exposed Live High Voltage Conductor or any conductive equipment / apparatus con-nected to the Live High Voltage conductor.

Examples of conductive equipment / apparatus connected to Live High Voltage conductors are corona rings, busbar clamps, expansion clamps and arcing horns etc, as depicted in figure 3.2.1.

2. A distance of 300 mm shall also be maintained, at all System voltages, from the portion of insulators supporting Live High Voltage Conductors which is outside the appropriate Safety Distance from the Conductors.

3. Individuals shall not allow any part of their body or objects to approach within the following Safety Distances detailed in the table below unless the conductors have been Isolated, Earthed and a Safety Document has been issued.

Nominal System Voltage Safety Distance (X)

Up to and including 33 kV 0.8 m

Exceeding 33 kV but not exceeding 66 kV 1.0 m





Table 3.2.1 – Safety Distances

Figure 3.2.1 – Safety Distances





4. When Points of Isolation have been established, exposed conductors could still be Charged at High Voltage. The only objects permitted to approach within the specified Safety Distances, within the zone established by Points of Isolation shall be:

Approved voltage measuring devices

Earthing Devices

An Approved Discharge Device.

3.3 Safety Precautions for Work on or adjacent to High Voltage Equipment

1. When work, excluding operational or safety switching, is to be carried out on or adjacent to HV Equipment, a Senior Authorised Person shall assess the means of achieving Safety from the System. When Safety from the System can be achieved by limiting the work or work area, instructions in writing, clearly defining the limits shall be given where verbal in-structions are not adequate. When the Senior Authorised Person issues instructions in writing, he/she shall issue a Limitation of Access (LOA) certificate.

2. When Safety from the System cannot be achieved by limiting the work, or work area, the following safety precautions shall be applied: -

a. The Control Person or Senior Authorised Person shall release the HV Equip-ment from Operational Service, by use of a Switching Schedule and record its release.

b. The HV Equipment shall be Isolated at all points of infeed. Isolating Devices shall be Locked (where the facility exists) and Caution Notices shall be affixed at all Points of Isolation.

c. Primary Earths shall be applied within the zone established by the Points of Iso-lation. Primary Earths shall where reasonably practicable be Locked. Application of all Primary Earths shall be recorded.

d. Where applicable, the contents of the HV Equipment shall be adjusted to a level that avoids Danger. Where drain valves / vent valves are used they shall where practicable be Locked in the appropriate position. This may involve the purging / venting of systems.

e. Where Danger could arise from the release of stored energy, action shall be taken to contain or dissipate this energy safely by Approved Procedures or manufac-turer’s instructions.

3. When work on the HV Equipment does not require the removal of Primary Earths a Per-mit to Work shall be issued by a Senior Authorised Person.

4. It is permissible for more than one Permit to Work to be issued within the same zone established by Point(s) of Isolation

5. Any additional precautions taken during the course of work to maintain Safety from the System shall be specified on the Safety Document.





6. When work is to be carried out on HV Equipment and there is a possibility that an LV supply can backfeed the HV Equipment through a transformer, the Senior Authorised Person shall ensure that appropriate LV Isolation is achieved. The Point(s) of Isolation shall where practicable be Locked.

7. When testing on HV Equipment, requires the removal of Primary Earths a Sanction for Test shall be issued by a Senior Authorised Person. A Sanction for Test shall be issued to a Competent Person suitably trained and authorised under TCS ESR Supporting Pro-cedure 7 (SRSP7) – “Testing of HV Equipment”. Provided that Safety from the System is maintained the following additional precautions shall be applied: -

a. The Primary Earths that may be removed or replaced during testing shall be iden-tified.

b. The HV Equipment on which the testing is to take place shall be defined, as will the method of testing.

c. Testing shall be carried out in accordance with TCS ESR Supporting Procedure 7 (SRSP7) – “Testing of HV Equipment” and an Approved Method Statement.

d. No Permit to Work and Sanction for Test shall co-exist within the same zone es-tablished by Point(s) of Isolation.

e. Essential supplies that are necessary to enable the testing to take place shall be defined on the Sanction for Test.

f. The recipient of the Sanction for Test shall provide Personal Supervision during testing and be responsible for maintaining Safety from the System during the pe-riod of test.

8. Compartments or enclosures within the work area of a Safety Document containing Live HV conductors must be secured at all times to prevent unauthorised access.

9. While a Safety Document is in force Safety Keys shall be kept in a Key Safe that can only be accessed by a Senior Authorised Person.

3.4 General Safety Precautions and Procedures Applicable to Low Voltage Systems

All work on or near to LV Equipment shall be carried out in accordance with TCS ESR Supporting Procedure 11 (SRSP11) – LV Systems.

1. The preferred method shall be to work on or near LV Equipment which is Dead. Work shall not be carried out Live when it is reasonably practicable to work Dead.

2. When work is to be carried out on or near to LV Equipment, a Senior Authorised Per-son shall assess the means of achieving Safety from the System. The Senior Author-ised Person shall take into account the type of LV Equipment, whether work is to take place under Dead conditions or can be justified under Live conditions, and if a Safety Document is to be issued.

3. Control and operation of LV Systems shall be in accordance with TCS ESR Supporting Procedure 11 (SRSP11) – LV Systems. A Senior Authorised Persons shall be responsi-ble for the co-ordination, Switching and the preparation and issue of Safety Documents on LV Systems.





3.5 General Requirements for Working on Dead Low Voltage Equipment and Conductors

When Safety from the System cannot be achieved by limiting the work or work area, work on or near to LV Equipment shall where reasonably practicable be carried out with the LV Equipment Dead. The following safety precautions shall be applied:-

a) The Senior Authorised Person shall identify the LV Equipment and then release it

from operational service. b) The Senior Authorised Person shall ensure Equipment to be worked on is Isolated

and Point(s) of Isolation established. Fuses, links and Safety Key(s) used to secure the Point(s) of Isolation shall be retained in safe custody.

c) The Senior Authorised Person shall ensure Danger has been excluded from Charged conductors.

A Senior Authorised Person shall assess the work required on or near to the Dead LV Equip-ment and decide whether it will be carried out under:-

a) A Permit to Work and/or an LV Permit to Work (where Point(s) of Isolation only are required),

b) Personal Supervision of the Senior Authorised Person, or c) Oral instructions (where RAMS are deemed wholly sufficient to control Safety from

the System).

Work on or near to Dead LV Equipment in conjunction with, in the vicinity of, or requiring Isola-tion of, HV Equipment shall be carried out to the TCS Supporting Procedure 11 (SRSP11) – LV Systems.

3.6 Additional Precautions for Working on Dead Low Voltage Cables

1. When work is to be carried out on LV cables which could be subject to Impressed Condi-tions from a HV circuit, additional precautions to prevent Danger shall be taken in ac-cordance with TCS ESR Supporting Procedure 9 (SRSP9) – Cable Systems.

2. If a cable has been damaged or has faulted, the cable must not be approached until it has

been Isolated from the supply.

3.7 Work on or Testing of Live Low Voltage Equipment and Conductors

1. Work shall not be permitted on or near any Live LV conductor where Danger may arise, unless:-

a) It is unreasonable in all the circumstances for it to be Dead; and

b) It is reasonable in all the circumstances to be at work on or near it while it is Live; and

c) Suitable precautions (including where necessary the provision of suitable protective equipment) are taken to prevent injury.

2. No LV Live work shall be carried out except in accordance with TCS ESR Supporting Pro-cedure 11 (SRSP11) – LV Systems.

3. A Senior Authorised Person shall assess the work required on or near to Live LV Equipment and ensure a safe system of work is developed as per TCS Supporting Pro-cedure 11 (SRSP11) – LV Systems. This shall include the decision to issue a Certificate





for Live LV Work (CLLVW) as a control. The safe system of work shall adequately pre-vent Danger from electric shock and inadvertent short-circuiting of conductors.

3.8 Identification of Equipment

1. Work shall only be carried out on Equipment that is readily identifiable. A means of identi-fication shall be fixed to the Equipment and must remain in place and be clearly visible and legible during the course of the work.

3.9 Demarcation of Work Areas in Substations

1. Demarcation of work areas in substations shall be carried out in accordance with an Ap-proved procedure.

3.10 Movement and Use of Vehicles, Ladders and Other Long Objects

1. Movement and use of vehicles, ladders and other long objects in substations shall be car-ried out in accordance with an Approved procedure.

3.11 Automatic/Remotely Controlled Equipment

1. Where work is to be carried out on automatically or remotely controlled Equipment, the precautions taken to achieve Safety from the System shall include making the automatic or remote control features and local control features inoperable. Locks shall be applied to prevent the features being restored until the work has been completed.

2. If a Sanction for Test is issued the test procedure should include the means of maintaining Safety from the System whilst any automatic, remote or local control features are opera-ble.

3.12 Switching Operations

1. Prior to carrying out Switching operations to Isolate and Earth a System (or part thereof) in preparation to issue a Safety Document, a Senior Authorised Person or Control Per-son shall prepare a Switching Schedule that lists the proposed Switching operations.

2. A Control Person or Senior Authorised Person who has not planned the Switching Schedule shall where reasonably practicable check and signify approval of the document.

3. The sequence of operations shall ensure that the System is Isolated from all points of supply, including voltage and auxiliary transformers and common neutral earthing Equip-ment from which the System may become Live.

4. Immediately before carrying out the operations in a Switching Schedule the Control Per-son shall check the state of the HV System via SCADA and ascertain whether there is other work that may impact the proposed switching operations.





5. Each Switching operation shall be recorded on the Switching Schedule immediately after the operation with the:

Date

Time

Initials of the individual undertaking the switching operation

Where switching is undertaken by an Authorised Person or Senior Authorised Person they shall confirm completion of the Switching Schedule to the Control Person.

6. The Control Person shall record the completion of the Switching Schedule and amend the HV System diagram to show the revised System configuration.

7. The completed Switching Schedule shall be retained by the Control Person for a period of 24 months after the completion of the Switching Schedule activities.

8. All Switching activities shall be in accordance with TCS ESR Supporting Procedure 2 – “Operational and Safety Switching”.

4 SAFETY DOCUMENTS PROCEDURES

4.1 General

1. This part of the Electrical Safety Rules contains procedures for the preparation, issue, clear-ance and cancellation of Safety Documents.

2. All individuals involved in these procedures shall be trained, and if appropriate authorised, in their roles and responsibilities.

3. Any preparation, issue, clearance or cancellation of a Safety Document shall be in accord-ance with TCS ESR Supporting Procedure 6 (SRSP6) – “Safety Documents & Lost Key Procedure”.

4.2 Application

1. A Safety Document shall be prepared, issued and cancelled by a Senior Authorised Per-son only.

2. A Safety Document shall be issued to a Competent Person in accordance with section 4.5, Issue of Safety Documents, of these Electrical Safety Rules.

3. The maximum number of Safety Documents that may be held by a Competent Person at any one time shall not exceed 3.

4. A Safety Document shall be issued to cover: -





a. Access - when limiting the work or work area and/or access is sufficient alone to achieve Safety from the System and where verbal instructions are not adequate.

b. Work and/or Testing - when precautions need to be taken to achieve Safety from the System for work on Equipment.

4.3 Application of Safety Precautions

1. Safety precautions shall be applied prior to the issue of a Safety Document. The Senior Authorised Person shall record the safety precautions that have been carried out on the Safety Document.

2. The Safety Keys securing Safety from the System shall be placed by the Senior Author-ised Person in a Key Safe. The Control Key shall be operated and retained by the Senior Authorised Person in safe custody.

3. The Senior Authorised Person shall prepare the Safety Document in readiness for issue, obtaining when necessary confirmation of precautions taken across control boundaries from the Control Person.

4.4 Preparation of Safety Documents

1. Preparation of Safety Documents shall only be carried out by a Senior Authorised Per-son and on completion of the safety precautions taken to achieve Safety from the System. The Senior Authorised Person preparing a Safety Document shall enter the following details as appropriate: -

a. Location of work

b. Identification of Equipment to be worked on including the Circuit Identification and/or Equipment Identification

c. Work to be done

d. Limits of the work or the work area

e. Precautions taken to achieve Safety from the System

f. Further precautions to be taken during the course of the work to avoid System de-rived hazards

g. Safety precautions which may be varied by the recipient

h. Points of Isolation

i. Earthing Devices applied

j. Control Person giving Consent to the preparation

k. Key Safe number

l. Signature, time and date

Note: all Safety Documents Shall have a unique Safety Document Number

2. The Senior Authorised Person shall obtain Consent from a Control Person, prior to issue of a Safety Document, and the name of the Control Person shall be recorded under the





Preparation section. Where Reasonably Practicable the Control Person and the Senior Authorised Person should be separate individuals.

4.5 Issue of Safety Documents

1. The Senior Authorised Person issuing a Safety Document shall complete the Issue and Receipt section of the Safety Document and record as appropriate:

a. Key Safe Key issued from the Key Safe

b. Sketch (if provided)

2. The Senior Authorised Person issuing the Safety Document shall, if required, provide the Competent Person with the items listed in the Issue & Receipt section.

3. The Senior Authorised Person issuing the Safety Document shall ensure that the Com-petent Person: -

a. Reads and understands the Safety Document and any limits of work. This should include the Senior Authorised Person showing, where reasonably practicable, the safety precautions taken for the work to be carried out.

b. Can identify the Equipment to be worked on.

c. Is conversant with any further precautions or procedures to be followed.

4. The Senior Authorised Person shall sign the Issue section for the document to be formally issued.

4.6 Receipt of Safety Documents

1. To receive a Safety Document an individual must hold one of the following Authorisation levels: -

a. Competent Person

b. Authorised Person

c. Senior Authorised Person

2. The recipient of the Safety Document shall read and understand the requirements of the Safety Document and ensure he/she is conversant with the safety precautions established.

3. The recipient of the Safety Document shall sign the Issue and Receipt section entering the time and date to formally receive the Safety Document and all associated items issued with it.

4. The recipient of a Permit to Work or Sanction for Test shall personally retain in safe custody the Permit to Work or Sanction for Test, together with the Key Safe Key and any other items listed in the Issue and Receipt section.

5. The recipient of a Limitation of Access shall personally retain in safe custody the Limita-tion of Access, together with any other items listed in the Issue and Receipt section.





6. All members of the Working Party shall sign on to the Working Party Register.

4.7 Clearance and Cancellation of a Safety Document

1. Before signing the Clearance Section of a Safety Document the document holder shall ensure that: -

a. All individuals in the Working Party have been withdrawn from the work area and warned not to continue to work on the Equipment concerned. All members of the Working Party shall sign off the Working Party Register.

b. All items originally issued with the Safety Document are returned or accounted for as appropriate and all gear, tools loose materials and waste have been removed and guards and access doors have been replaced.

c. Any exceptions are recorded in the Cancellation Section of the Permit to Work or Sanction for Test.

2. If the Safety Document cannot be cancelled immediately it shall be secured in the substa-tion Control Room, or given to a Senior Authorised Person who will hold the Safety Document in safe custody.

3. If there are nil exceptions when a Permit to work or Sanction for Test is cleared, the Competent Person shall state this on the Permit to work or Sanction for Test.

4. A Senior Authorised Person shall cancel the Safety Document and advise the Control Person of the cancellation and any exceptions or restrictions on returning the Equipment to Operational Service.

5. Following the cancellation of all relevant Safety Documents and removal of safety precau-tions, the Senior Authorised Person shall return the Equipment to Operational Service.

6. All cancelled copies of Safety Documents and supplementary documentation shall be re-tained by the Control Persons for 24 months

Note: Where a Safety Document needs to be cleared in the absence of the Safety Document holder, the Approved procedure set out in Supporting Procedure 6 (SRSP6) shall be followed.

4.8 Lost Safety Document / Key Procedure

1. Lost Safety Document / Keys shall be addressed in accordance with TCS ESR Supporting Procedure 6 (SRSSP6) – “Safety Documents and Lost Key Procedure”.

5 RESPONSIBILITIES OF INDIVIDUALS APPOINTED UNDER THE ELECTRICAL SAFETY RULES

5.1 General

1. All individuals under appointment of these Electrical safety Rules shall comply with these Electrical Safety Rules and have regard to the supporting mandatory and guidance docu-ments.





5.2 Categories of Authorisation

1. The following categories of authorisation are recognised by the Electrical Safety Rules and appointment shall be in accordance with an Approved Procedure.

a. Person

b. Competent Person

c. Authorised Person

d. Senior Authorised Person

e. Control Person

2. The written Certificate of Level of Authorisation shall state the level of Authorisation of an individual.

Persons Responsibilities

1. A Person shall act in a way as to prevent Danger to themselves and others.

2. A Person shall follow the instructions of the working party leader and all other authorised individuals.

5.3 Competent Person Responsibilities

1. Within the limits imposed by their certification a Competent Person may receive Safety Documents from a Senior Authorised Person and shall be responsible for carrying out the work in accordance with the Safety Document and Approved procedures.

2. A Competent Person, when in charge of a Working Party shall ensure that all members of the Working Party understand the instructions specified in the Safety Document and the limits imposed on the work and/or working area.

3. Personally retain the Safety Document, Key Safe Key, and any other items and supple-mentary documents issued, in safe custody.

4. When in charge of work or testing, provide Local Supervision or Personal Supervision as determined by an Senior Authorised Person.

5. Ensure all “Further Precautions” listed in the Safety Document are taken to ensure Safety from the System.

6. Withdraw all individuals from work on Equipment if a potential hazard is identified that gives rise to Danger and report the situation to a Senior Authorised Person.





7. Before clearing a Safety Document a Competent Person shall ensure that:

a. All individuals in the Working Party have been withdrawn and are aware that all work under the Safety Document is suspended

b. All tools and materials have been removed

c. Guards and access doors have been replaced

d. Key Safe Key, supplementary documents and other items associated with the Safety Document have been returned to the Senior Authorised Person.

5.4 Authorised Person Responsibilities

1. In addition to the responsibilities of a Competent Person, an Authorised Person shall have the following responsibilities within the limits imposed by their certification: -

a. Carry out HV switching operations as instructed by a Control Person or Senior Authorised Person.

5.5 Senior Authorised Person Responsibilities

1. In addition to the responsibilities of an Authorised Person, a Senior Authorised Person shall have the following responsibilities within the limits imposed by their certification: -

a. Comply with the Electrical Safety Rules for the releasing of Equipment from Oper-ational Service, for work or testing.

b. Control and Co-ordination of LV Systems including the preparation, issue and can-cellation of Safety Documents.

c. Prepare Switching Schedules

d. Prepare, Issue and cancel Safety Documents for access, testing and work on HV Equipment in accordance with the Electrical Safety Rules

e. After cancelling a Safety Document, ensure that the Equipment is in the correct operational state to return to Operational Service.

f. Determine whether work on, or testing of, Equipment, is to be carried out under Local Supervision or Personal Supervision.

5.6 Control Person Responsibilities

1. A Control Person is deemed by the Company to be the duty holder responsible for the electrical system under the Electricity at Work Regulations 1989.

2. A Control Person shall have the following responsibilities: -

a. Preparation and issue of HV System Change Certificates (HVSCC)

b. Maintain the current HV System diagram in the substation (or remote) Control Room

c. Check and signify approval of Switching Schedules





d. Sanctioning the release of Equipment from Operational Service

e. Control and co-ordinate safety activities necessary to achieve Safety from the Sys-tem

f. Instruct Authorised Persons or Senior Authorised Persons to carry out specific switching activities

g. Prior to giving Consent to the issue of a Safety Document, ensure the following: -

i. that the control function for the Location, in accordance with mandatory safety rules, has been implemented

ii. that the Control Persons of other Systems have been consulted to agree, initiate and record those actions necessary to establish and maintain safety precautions on Equipment which is interconnected across control bounda-ries

iii. Obtain confirmation from the Senior Authorised Person that the safety pre-cautions which have been taken are adequate for the work or testing to be done.

h. Checking that the Safety Document to be issued correctly defines the Equipment which is to be released for work or testing together with the safety precautions taken.

i. Checking, prior to giving Consent to the issue of a Safety Document, the accuracy of Circuit Identification as reported from Locations remote from the Location where a Safety Document is to be issued.

j. Giving Consent to the issue and acknowledging the cancellation of Safety Docu-ments.

k. Implementing the necessary procedures to ensure that the safety precautions es-tablished to achieve Safety from the System are maintained during the period the Safety Document is in force.





6 NOTES


Transmission Capital Services APPENDIX 1 – PERMIT TO WORK (PTW)

APPENDIX 1 – PERMIT TO WORK (PTW)


Transmission Capital Services APPENDIX 1 – PERMIT TO WORK (PTW)


Transmission Capital Services APPENDIX 2 – SANCTION FOR TEST (SFT)

APPENDIX 2 – SANCTION FOR TEST (SFT)


Transmission Capital Services APPENDIX 2 – SANCTION FOR TEST (SFT)


Transmission Capital Services APPENDIX 3 – LIMITATION OF ACCESS

(LOA)

APPENDIX 3 – LIMITATION OF ACCESS (LOA)


Transmission Capital Services APPENDIX 3 – LIMITATION OF ACCESS

(LOA)


Transmission Capital Services APPENDIX 4 – LV / MECHANICAL

PERMIT TO WORK

APPENDIX 4 – LV / MECHANICAL PERMIT TO WORK


Transmission Capital Services APPENDIX 4 – LV / MECHANICAL

PERMIT TO WORK


Transmission Capital Services APPENDIX 5 – CERTIFICATE FOR LIVE

LV WORKING

APPENDIX 5 – CERTIFICATE FOR LIVE LV WORKING


Transmission Capital Services APPENDIX 5 – CERTIFICATE FOR LIVE

LV WORKING


Transmission Capital Services APPENDIX 6 – HV SYSTEM CHANGE

CERTIFICATE

APPENDIX 6 – HV SYSTEM CHANGE CERTIFICATE


Transmission Capital Services APPENDIX 6 – HV SYSTEM CHANGE CERTIFICATE


Transmission Capital Services APPENDIX 7 – SWITCHING SCHEDULE

APPENDIX 7 – SWITCHING SCHEDULE


Transmission Capital Services APPENDIX 7 – SWITCHING SCHEDULE


Transmission Capital Services APPENDIX 8 – RECORD OF INTER SYSTEM SAFETY PRECAUTIONS

(RISSP)

APPENDIX 8 – RECORD OF INTER SYSTEM SAFETY PRECAUTIONS (RISSP)

Implementor



(RISSP)



(RISSP)

Requestor



(RISSP)


Transmission Capital Services APPENDIX 9 – WORKING PARTY REGISTER

APPENDIX 9 – WORKING PARTY REGISTER

WORKING PARTY REGISTER

Safety Document reference number

(PTW, SFT, LOA)

Name of Competent Person in charge of

Working Party (document holder/recipient)

I the undersigned, hereby declare that I understand the requirements outlined on the above documents and the instruc-

tions given by the Competent Person in charge of the Working Party.

Name Company Sign On Sign Off

Signature Date & Time Signature Date & Time

* Write N/A if not applicable