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The following information is associated with Network Rail Standard: NR/L3/ELP/29987 Issue 5

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Module information

Network Rail Standards

Proceed to document u

Information for users

To access individual modules referenced within this standard, blue active links are provided from the relevant index pages where these are listed. Clicking on a specific reference will lead to the corresponding document. Please ensure to open bookmarks for easier navigation within the document and to access index of modules.

Alternatively, you may use the search facility to search for a specific document by using the complete document reference number – such as NR/L3/SIG/30082/002 – in the search field.



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Ref: NR/L3/ELP/29987

Issue: Date: 01 December 2018 Compliance date: 01 June 2019

Level3

Work Instruction

Working On or About 25 kV A.C. Electrified Lines

Approvals

Content approved by:

Paul Thompson,

Technical Lead

Content approved by:

.. �.:� ............................................ .

Philip Doughty,

Standard and Control Document Owner

Approved for publication by:

Mick McManus,

Standards and Controls Management team

This document is the property of Network Rail. It shall not be reproduced in whole or part nor disclosed to a third party without the written permission of Network Rail.

© Copyright 2018 Network Rail.

Uncontrolled copy or:ice printed from its electronic source.

Published and Issued by Network Rail, 2nd Floor, One Eversholt Street, London NW1 2DN.

Network Rail

-.. I



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Ref: NR/L3/ELP/29987 Issue: 5 Date: 01 December 2018 Compliance date: 01 June 2019

Page 2 of 29

User information This Network Rail standard contains colour-coding according to the following Red–Amber–Green classification.

Red requirements – no variations permitted

• Red requirements are to be complied with and achieved at all times.

• Red requirements are presented in a red box.

• Red requirements are monitored for compliance.

• Non-compliances will be investigated and corrective actions enforced.

Amber requirements – variations permitted subject to approved risk analysis and mitigation

• Amber requirements are to be complied with unless an approved variation is in place.

• Amber requirements are presented with an amber sidebar.

• Amber requirements are monitored for compliance.

• Variations can only be approved through the national variations process.

• Non-approved variations will be investigated and corrective actions enforced.

Green guidance – to be used unless alternative solutions are followed

• Guidance should be followed unless an alternative solution produces a better result.

• Guidance is presented with a dotted green sidebar.

• Guidance is not monitored for compliance.

• Alternative solutions should be documented to demonstrate effective control.



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Compliance This Network Rail standard/control document is mandatory and shall be complied with by Network Rail Limited and its contractors if applicable from 1st June 2019. Where it is considered not reasonably practicable1 to comply with the requirements in this standard/control document, permission to comply with a specified alternative should be sought in accordance with the Network Rail standards and controls process, or with the Railway Group Standards Code if applicable. If this standard/control document contains requirements that are designed to demonstrate compliance with legislation they shall be complied with irrespective of a project’s GRIP stage. In all other circumstances, projects that have formally completed GRIP Stage 3 (Option Selection) may continue to comply with any relevant Network Rail standards/control documents that were current when GRIP Stage 3 was completed. NOTE 1: Legislation includes Technical Specifications for Interoperability (TSIs).

NOTE 2: The relationship of this standard/control document with legislation and/or external standards is described in the purpose of this standard.

Disclaimer In issuing this standard/control document for its stated purpose, Network Rail Limited makes no warranties, expressed or implied, that compliance with all or any standards/control documents it issues is sufficient on its own to provide safety or compliance with legislation. Users are reminded of their own duties under legislation. Compliance with a Network Rail standard/control document does not, of itself, confer immunity from legal obligations. Where Network Rail Limited has granted permission to copy extracts from Network Rail standards or control documents, Network Rail Limited accepts no responsibility for, nor any liability in connection with, the use of such extracts, or any claims arising there from.

This disclaimer applies to all forms of media in which extracts from Network Rail standards and control documents might be reproduced.

Supply Copies of standards/control documents are available electronically, within Network Rail’s organisation. Hard copies of this document might be available to Network Rail people on request to the relevant controlled publication distributor. Other organisations can obtain copies of this standard/control document from an approved distributor.

1 This can include gross proportionate project costs with the agreement of the Network Rail

Assurance Panel (NRAP).



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Issue record

Issue Date Comments 4 June 2015 Incorporation of several outstanding letters of

instruction. Changes to wording to improve clarity and consistency. Reformatted and reworded to comply with current ‘house style’ for the drafting of Network Rail standards. R-A-G indications and definitions added.

5 December 2018 Incorporation of several Emergency Changes with the formalisation of Modules X & Y into the standard. Update of scope excluding areas undertaking the trial of the Single Approach to isolations on 25kV a.c. infrastructure.

Reference documentation

GE/RT8000 Railway Group standard: Rule Book NR/L2/CTM/014 Competence & Training In Overhead Line Engineering NR/L2/CTM/018 Competence & Training In Traction Power Distribution

Engineering NR/L2/ELP/21088 General Maintenance Parameters for Overhead Line

Electrification Equipment NR/L2/ELP/24011 Network Rail standard: Booster Transformer Outages NR/L2/ELP/24013 Network Rail standard: Notification of Energisation of New

AC and DC Electrified Lines NR/L2/ELP/27550 Traction Power Isolation Documentation NR/L2/ELP/27715 Overhead Contact System design specification NR/L2/RVMP/0200 Infrastructure Plant Manual NR/L2/ELP/27314 Test & Commissioning of New or Modified Overhead

Contact Systems NR/L2/OHS/019 Safety of people at work on or near the line NR/L3/ELP/21067 Network Rail standard: Instructions for Making Out, Issuing

and Cancelling High Voltage Permits-to-Work, Sanctions-for-Test and Circuit State Certificates

NR/L3/ELP/27237 Network Rail standard: Overhead Line Work Instructions NR/SP/ELP/21085 Network Rail standard: Specification for the Design of

Earthing and Bonding systems for 25 kV AC Electrified Lines

NR/SP/ELP/21131 Network Rail standard: Warning and Other Signs for AC and DC Electrified Lines



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NR/SP/ELP/27203 Network Rail standard: Provision of Isolation, Earthing and Indication Facilities where Local Isolations are Permitted on AC Electrified Lines

NR/SP/ELP/27205 Network Rail standard: Installation and Operation of Buffer Sections and Permanently Earthed Sections in AC Overhead Line Equipment



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Contents 1 Purpose 7

2 Scope and Modules 7

3 Definitions 9



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1 Purpose This modular standard sets out a consistent approach to working on or about 25 kV electrified lines in relation to the dangers arising from proximity to live equipment. This overarching standard for the modules provides an introduction to the suite of modules and consistent use of terminology in the application of the standard. This standard and each of its modules should be read in conjunction with all other standards relevant to the activity to be undertaken. NOTE: Further requirements are contained in the Rule Book Module AC (GE/RT8000/AC) and Handbook 16 (GE/RT8000/HB16).

Compliance with this standard will mitigate the risks of electric shock or equipment damage resulting from uncontrolled approach to, or contact with, live overhead line equipment, high voltage bushings or cable sealing ends or through mishandling of conductors carrying electric traction current. Compliance with this standard will also mitigate the risks of injury or equipment damage resulting from incorrect or uncoordinated installation, testing, operation, maintenance, repair and dismantling of 25 kV a.c. electrified equipment. 2 Scope and Modules This standard applies to all those required to work on 25 kV a.c. electrified lines, or so near to them that danger might arise, including persons who:

a) assess electrical risk; b) plan, prepare and implement mitigations of electrical risk such as isolating,

earthing and issuing of formal safety assurance documents; c) install, test, operate, maintain, repair and dismantle 25 kV a.c. overhead line

equipment and traction return systems; d) use special tools to work on live overhead line equipment; or e) work on rail vehicles or other equipment within 2.75 metres (9 feet) of

overhead line equipment normally energised at 25 kV a.c.; f) work on or about any future sections of electrification on Network Rail

controlled infrastructure and areas required to adopt a process for securing points of disconnection to form points of isolation to implement a Supplementary Isolation Process (Module X);

g) plan, prepare and implement isolations on 750V d.c. overhead line equipment system (Sheffield Tram Train – Module Y);

h) work on or about 25kV electrified lines except for areas undertaking the trial of the Single Approach to Isolations on 25kV a.c. infrastructure and Network Rail controlled infrastructure equipped with the 1500V d.c. overhead line system.

It is applicable to Network Rail personnel and to Network Rail’s contractors. To provide a consistent approach to working on or about 25 kV a.c. electrified lines, Train Operating Companies may, as best practice, apply this standard to infrastructure they control.



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Index of modules

Module Title Issue Date Standard Working On or About 25 kV A.C.

Electrified Lines 5 01/12/2018

1 General Requirements 5 01/12/2018 2 Assessment of Electrical Risks 5 01/12/2018 3 Management of Electrical Risks 5 01/12/2018 4 Maintaining the Integrity and Safe

Operation of 25 kV A.C. Electrified Lines 5 01/12/2018

5 Particular Actions to be Taken by the Infrastructure Maintainer

5 01/12/2018

6 Planning of Isolations 5 01/12/2018 7 Isolation and Earthing of Overhead Line

Equipment 5 01/12/2018

8 Local Isolation and Earthing of Overhead Line Equipment

5 01/12/2018

9 Isolation and Earthing when Constructing or Dismantling Overhead Line Equipment

5 01/12/2018

10 Use of Voltage Testing Devices, Portable Earthing Equipment and Temporary Continuity Jumpers

5 01/12/2018

11 Working On Overhead Line Equipment 5 01/12/2018 12 Management of Local Isolation

Instructions for Overhead Line Equipment

5 01/12/2018

W Planning and Implementation of Overhead Line Permits and Western Limitation of Access Certificates on Overhead Line Equipment

Withdrawn 01/12/2018

X Securing of points of disconnection for earthed isolations on new electrification infrastructure

2 01/12/2018

Y Isolation and Earthing of Sheffield Tram Train D.C. Overhead Electrified Lines.

2 01/12/2018



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3 Definitions For the purpose of this standard, the following terms and definitions apply.

Alternative feed switch Overhead line switch which connects a subsection of overhead line equipment to either of two other subsections of overhead line equipment. Alternative feed switches are also used to provide a supply to other electrical equipment from either of two sections of overhead line equipment.

APC track inductor Magnet fixed on the sleeper ends before and after a neutral section which operates the automatic power control system on a train.

Authorised person (AP) Person who holds a certificate to show that they are competent to carry out specific duties in relation to the requirements of this standard.

Authority to test (Form B) Form of declaration issued by an Electrical Control Operator to a Nominated Person using the Form B ‘Authority to Test’. NOTE The purpose of the Form B is to tell the Nominated Person exactly which equipment is switched off and to grant permission to commence testing and applying portable earths.

Automatic dropping device (ADD) Device which automatically lowers the pantograph to minimise damage to the overhead line equipment if:

a) the pantograph carbons are displacedor the head is damaged; or

b) the pantograph head becomesdamaged or detached; or

c) the pantograph height limit is exceeded.



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Automatic power control (APC) Means by which the electric power circuits on the traction unit are:

a) automatically switched OFF before atrain enters a neutral section; and

b) automatically switched ON after a trainleaves a neutral section.

NOTE: This is also used where a permanently earthed section under which electric trains can run is installed beneath a very low bridge. See ‘Permanently earthed section’.

Autotransformer (AT) Transformer with a single winding that is centre tapped to provide a zero potential traction return connection. The +25 kV terminal is connected to the catenary and the –25 kV terminal is connected to theautotransformer feeder. NOTE: An autotransformer is used in this way as a device to assist with system voltage regulation and reduce to a minimum any interference with lineside equipment.

Autotransformer feeder (ATF) Live bare conductor or cable, connecting the 25 kV terminals of adjacent autotransformers. The autotransformer feeder is normally a bare conductor mounted upon 25 kV insulators directly above the mast on cantilever and headspan structures, or directly above the uprights of a portal structure.

Autotransformer feeding system System of electrification in which the supply transformer secondary voltage is 50 kV, centre tapped to earth. Two live 25 kV secondary connections are made to the catenary and autotransformer feeder wires respectively. The earthed centre tapping is connected to the traction return circuit. Autotransformers are installed at intervals along the system to assist with voltage regulation and system immunisation.



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Autotransformer site (ATS) Building and/or compound containing electrical switchgear, autotransformers and other electrical equipment which is arranged to connect the autotransformers to the autotransformer feeders, overhead line equipment and traction return rails. The switchgear is also arranged so as to connect together a number of sections of overhead line equipment and autotransformer feeders at that location.

Auxiliary catenary wire Bare stranded conductor which is the middle wire where there are three vertically spaced wires in the overhead line equipment. It is suspended from the catenary wire. The contact wire is suspended from the auxiliary catenary wire.

Bare feeder (BF) Bare live conductor, forming a connection between two separate electrical sections or a switching station and the overhead line equipment and identified as such on an isolation diagram. See ‘Riser’.

Block To Electric Trains (BTET) Arrangement between Electrical Control Operator and Route Controller, signal box Supervisor or Signaller to block the line to electric trains. The granting of a BTET does not mean that all train movements are stopped on the lines concerned, and where necessary such arrangements shall be made in accordance with the Rule Book GE/RT8000 The granting of a BTET does not mean that the electrical supply has been switched off.

Block to electric trains (Form AE) Communications or process (and form) initiated by an Electrical Control Operator to arrange for a Route Controller, signal box Supervisor or Signaller to block to electric trains specific lines or routes and to gain confirmation that the block to electric trains has been imposed.

Bond Electrical connection to or in the running rail traction return circuit, or in a signalling track circuit.



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Booster transformer (BT) Device to induce into the return conductors virtually all the traction return current, so as to minimise electrical interference with communication circuits.

Buffer section A special example type of Permanent Earthed Section (PES) which is provided at the extremity of energised OLE where it abuts onto equipment not yet declared energised (usually under construction). See ‘Permanently earthed section’.

Bushing Special insulator which provides a passage for a conductor through a partition such as a wall or roof and insulates it from the partition.

Cable Insulated conductor which might be laid directly in or on the ground or in pipe or troughing or attached directly to an overhead line structure or bridge or tunnel wall.

Cant rail Line of intersection on the vertical profile of a rail vehicle or traction unit at which the bodyside meets the roof.

Catenary wire Bare stranded conductor which is the uppermost of the wires forming the overhead line equipment.

Caution notice Notice attached to an overhead line switch giving warning that it might form part of an isolation.

Circuit Arrangement of conductors and electrical apparatus connected to an electricity supply.

Circuit breaker Switch arranged to open automatically when a current above a set value or phase angle flows through it.

Competent person In the context of this standard, person with sufficient technical knowledge or experience to avoid danger.

Conductor Material which permits electricity to flow readily through it. In this context a solid or stranded wire forming part of the overhead line equipment and which carries the electric current.



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Contact wire Bare solid conductor which is the lowest of the wires forming the overhead line equipment. The pantograph carbons of electric trains press against the underside of this wire and collect the electric current.

Continuity bond (traction) Bond across the gap in the traction return rails at points and crossings.

Contractor Organisation contracted to Network Rail for specific work on its infrastructure.

Controller of site safety (COSS) As defined in GE/RT8000. In the context of this standard, Controller of Site Safety is also taken to include Safe Work Leader.

Cross bond (traction) Bond between the traction return rails of the same track or adjacent tracks.

Cross-span wire Wire suspended across tracks, holding the overhead line equipment in the correct position.

Current Rate of flow of electrical charge

Daily Wire A daily supplement to the Weekly Operating Notice (WON)

De-energisation Switching off of the electricity supply to overhead line equipment.

Designated earthing point (DEP) Location at which the overhead line equipment can be earthed, for the purpose of issuing Overhead Line Permits, using short portable earths applied between spigots using insulated earthing poles.

Designated person (DP) As defined in GE/RT8000.

Dropper Arrangement of wires or strips and clips by which one wire of the overhead line equipment is suspended from another.

Dual electrified line Line which is electrified using the 660/750 V d.c. conductor rail system, as well as the 25 kV a.c. overhead line system, to allow trains of either system to operate.



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Earth The general mass of the earth and any conductor in direct electrical connection with it. NOTE 1: ‘Earth’, for the purpose of overhead line equipment only, is also used to denote the running rail traction return circuit and the overhead line equipment supporting structures which are connected to it.

NOTE 2: The term ‘earth’ is also used to refer to the cable used to form a connection between overhead line conductors and earth. See ‘Portable earth’.

Earth wire Wire electrically connecting together the steelwork of two or more structures where circumstances prevent each structure from being independently bonded directly to the traction return running rail. The earth wire can be aerial, at ground level or buried.

Earthed Connected directly to the traction return running rail or to a structure which is itself connected to the traction return running rail (when used in the context of overhead line equipment which is normally live).

Earthing connection Conductor for connecting electrical equipment to earth or to the running rail traction return circuit.

Earthing device Normally open, remotely controlled switch or circuit breaker which when closed connects the overhead line equipment to earth.

Earthing pole Device consisting of a bottom handle section, a primary insulator section and a top section, and other attachments, used for the application and removal of short portable earths, long portable earths and temporary continuity jumpers. An earthing pole may also be used to apply certain voltage testing devices and to operate other approved live line tools.

Earthing switch Overhead line switch which connects a section of overhead line equipment to earth. Switches are also fitted on the roofs of electric traction units so that the pantographs and electric train equipment can be connected to earth.



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Electric train Electrically powered train with one or more raised pantographs through which electric current is collected from the overhead line equipment. Dual powered, bi-mode or self-powered test trains with a raised pantograph are also classed as electric trains when operating with a raised pantograph. Electrically powered trains are NOT classed as electric trains when ALL pantographs are lowered.

Electrical control (EC) Secure location accommodating apparatus for the remote control of the electric traction system and the staff who operate it.

Electrical control instructions (ECI)

Specific instructions describing procedures the Electrical Control Operators must follow to carry out their duties, and the actions to be taken circumstances.

Electrical control operator (ECO) Person who controls the power supply to the electric traction system, who is responsible for all switching operations, facilitates isolations of its electrical equipment, and who holds a certificate to show that they are competent in these duties.

Electrical equipment Equipment used, intended to be used or installed to generate, transmit, transform, rectify, convert, distribute, conduct, control, store, measure or consume electrical energy.

Emergency switch-off The opening of a switching device intended to remove electrical power from an electrical installation to avert or alleviate a hazardous situation. NOTE: The ‘emergency switch-off’ becomes a short notice isolation when the Nominated Person has made the appropriate arrangements and issued Overhead Line Permits.

EMMIS controller Controller located in Ashford Control Centre responsible for monitoring and controlling the traction power supply to the Network Rail (High Speed 1 Ltd) controlled electrification system.

Energised See ‘Live’.



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Feeder Transmission line or cable in the electrical power distribution system for:

a) bringing a supply of electricity to afeeder station;

b) connecting a feeder station, tracksectioning cabin, track sectioninglocation or autotransformer Site to theoverhead line equipment.

Feeder station (FS) Building or compound containing electrical switchgear and equipment to which main supplies from the Electricity Supply Industry are brought and from which the overhead line equipment is supplied.

Feeder switch Overhead line switch which connects a section of overhead line equipment to its feeder at a switching station. NOTE: Switches can also have an ‘earth’ position.

Harmonic damper Arrangement of 25 kV resistors and capacitors housed in a structure mounted enclosure and connected to the electrification system. Its purpose is to reduce the magnitude of voltage spikes produced by electric trains which would otherwise damage the electrification system.

Headspan Form of construction where the overhead line equipment is supported by wires suspended from masts on each side of the track.

Headspan wire Wire suspended across tracks and from which overhead line equipment is suspended.

High Speed 1 (HS1) High speed line between London (St Pancras International) and Cheriton and its associated chords and connecting lines.

Impedance bond Device which allows traction return current to flow freely but impedes the flow of track circuit current so as virtually to isolate two track circuits from each other.

Infrastructure maintainer Organisation responsible for maintenance of the infrastructure.

Infrastructure maintainer’s staff Persons employed by the Infrastructure Maintainer who are competent, and have certificates where appropriate, to undertake specific duties in connection with 25 kV a.c. electrified lines.



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Insulated knuckle Knuckle with insulation between the two sets of overhead line equipment so that one is normally electrically separated from the other, except whilst the pantograph of an electric train passes under it.

Insulated overlap span Overlap span arranged with insulation between the two lengths of overhead line equipment so that by the opening of a switch or circuit breaker, or by the removal of connections, one equipment is electrically separated from the other except while the pantograph of an electric train passes through it.

Insulation Layer or covering of solid material which provides extremely high resistance to the passage of electricity.

Insulator Component constructed of rigid insulation designed to provide mechanical support or restraint while separating the live parts of a circuit from each other or from earth.

Isolate Disconnect and separate securely from all sources of electricity supply. See ‘Isolated’.

Isolated Disconnected and separated securely from all sources of electricity supply, in accordance with this standard. NOTE: It is not possible to isolate the return conductors as they are part of the return current system. The Return Conductor will be considered as isolated if the associated booster transformers have been isolated from all sources of supply as part of the OLE isolation

In this standard ‘isolated’ refers to the disconnection, separation and securing of those parts of the overhead line equipment normally live at 25 kV.

Isolating section Section of overhead line equipment installed usually at the changeover from a 25 kV a.c. overhead line system to a 660/750 V d.c. conductor rail system, designed to prevent traction return current flowing from one electrification system into another.

Isolating transformer Type of transformer installed at an isolating section. See ‘Isolating section’.



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Isolation Process which causes an electrical section(s) or subsection(s) of the overhead line equipment to be isolated intentionally and, in the context of this standard, to be secured so that in the event of an operational error, failure of a device or instance of material breakdown it will not inadvertently be re-energised through conduction, induction or capacitance so as to present danger. See ‘Isolated’. NOTE: An ‘Isolation’ can be taken to refer to the arrangements for the interruption of the traction electricity supply to a particular part of the railway, including details of the section(s) or subsection(s) or group of section(s) or subsection(s) being isolated, together with the dates and times, and shown as such in the Weekly Operating Notice. It embraces the entire process of switching off, securing, testing and earthing, and issue of Overhead Line Permits.

Isolation details form (IDF) Form produced by a Nominated Person to let all parties involved know in advance the specific details of each isolation.

Isolation diagram Diagram which shows schematically the electrified lines, the overhead line equipment sectioning, switching and feeding arrangements together with certain relevant signal and point numbers, adjacent overhead power lines and other relevant information. Diagrams use notes to highlight Residual electrical Hazards such as cross-track feeds, live sealing ends etc, these are identified in accordance with NR/L2/ELP/27550 See Residual Electrical Hazards (REH)



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Isolation instructions Instructions, in two separate complementary forms, which specify for each section and subsection of overhead line equipment either:

a) the electrical switching which normallyhas to be carried out to effect anisolation of the particular section orindividual subsection and theassociated limits of the isolated sectionor subsection for the purpose of issuingOverhead Line Permits; or

b) the protecting signals, the limits beyondwhich electric trains must not proceedand the signals or routes which are notto be used for electric trains, applicableto an isolated section or subsection.

Isolation limits See ‘Limits of isolation’.

Isolation plan Collated and coordinated information which defines, in advance, an isolation in terms of purpose, extent, timing and resources. See ‘Isolation planning form’.

Isolation planner Network Rail nominated representative competent in the isolation planning process, or their appointed agent.

Isolation planning form (IPF) Form issued by an Isolation Planner to let all parties involved in the isolation planning process know in advance the agreed isolations.

Isolation record book Document in which isolations carried out under a local isolation procedure are recorded. See ‘Isolation – Local isolation’.

Jumper Permanent or temporary electrical conductor which connects two conducting elements together which would otherwise be electrically separate or poorly connected.

Knuckle Item of equipment used to arrange the meeting of two sets of overhead line equipment at an angle without crossing one over the other. It is designed so that pantographs of electric trains can pass smoothly and without break of electrical contact from one contact wire to the other.



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Limits of isolation Limits stated in the isolation instructions for complete electrical sections and individual subsections, usually in the form of structure numbers, between which the Nominated Person may be authorised (by a message recorded on Form B) to test, earth and issue Overhead Line Permits (Form C).

Line guard Short length of mechanical protection fitted onto an overhead line conductor to prevent damage to the conductor when portable earths are applied.

Live At a voltage by being connected to a source of electricity or by induction or capacitance from other live conductors.

Local isolation Isolation carried out locally by a person who has local control over train movements, and so does not need to follow the Form A procedure, and is completed using a lock-off system instead of issuing an Overhead Line Permit.

Local isolation instructions Instructions for isolating and earthing overhead line equipment at specific locations carried out locally by a person who has local control over train movements. See ‘Isolation instructions’

Long portable earth Portable earth longer than 1.5 metres which has blue sheathing, for use at locations other than designated earthing points. NOTE: It is fitted at one end with a hand applied clamp suitable for attachment to an overhead line structure or traction return rail. At the line (live) end it is fitted with an earthing pole applied clamp suitable for attachment to an overhead line conductor.

Master bonding plan Plan drawing, jointly agreed by the relevant Route Asset Managers, which shows the tracks, track circuit and traction return rails and the bonding arrangements.



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Method statement Statement in a required format of the methods, systems, tools, plant and equipment and competence of persons to be used in performing a particular task, for the purpose of demonstrating that safety is not prejudiced. Example formats include:

• work package plans,

• task briefing sheets,

• work instructions, and

• risk control sheets.

Mid point connection (MPC) See ‘Bond – Return conductor-to-rail bond’.

Motorised switch

Power-operated overhead line switch which can be remotely controlled. NOTE: Switches can also have an ‘earth’ position.

Mutual screening conductor (MSC)

A separate conductor located alongside telecommunications cables, independently earthed down to copper rods at typically 1 km intervals. NOTE: The inductive coupling to the 25 kV OLE results in it carrying a current in opposite phase which suppresses the interference (value of longitudinal voltage VL) induced in the telecoms cables.

Network Rail (NR) Organisation owning and controlling the railway infrastructure.

Network Rail controlled infrastructure

As defined in the Network Rail Railway Safety Case.

Network Rail route Geographical subdivision of Network Rail.

Network Rail route control(ler) Network Rail organisation (person) that controls Operations.

Neutral section (NS) Arrangement of insulators installed in the overhead line equipment which is designed so that two sections which must not be connected electrically are kept separated even during the passage of pantographs of electric trains.

New overhead line equipment Overhead line equipment that is complete in every respect but is not yet in operational use. See ‘Overhead line under construction’ NOTE All new OLE, or OLE under construction which is physically connected to existing OLE is treated as live.



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Nominated person (NP) Person certificated as competent to carry out isolation and earthing, to issue and cancel overhead line permits or other authorities to work as defined in local isolation instructions, and nominated as such with electrical control in relation to particular equipment or locations.

Normally open switch Overhead line switch which, when required, connects two normally separate sections or subsections of overhead line equipment so as to provide an alternative electrical feed but is kept open in normal feeding arrangements.

Occurrence Book A book kept by signallers to record the passage of trains, transmission of bell signals and any exceptional circumstances.

Open circuit Condition applying when a circuit is incomplete (see Circuit), as caused by the opening of a switch, or by the omission of a connection in the circuit, which prevents the flow of electric current.

Overhead line equipment (OLE) Arrangement of wires, suspended over the railway line, for supplying electricity to electric trains, together with its associated fittings, insulators and other attachments including risers, feeders, autotransformer feeders, overhead line switches, jumpers and return conductors. NOTE: The term ‘overhead line equipment’ is sometimes used in a narrower sense to describe the electrical circuits of the overhead line contact system when it is necessary to distinguish them from those of the autotransformer feeders.

Overhead line jumper Flexible conductor which is a component of the overhead line equipment and which connects other parts of the overhead line equipment together electrically.



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Overhead line permit (Form C) Form of declaration signed and issued by a Nominated Person to the Controller of Site Safety (COSS) concerned with the work to be carried out on or near to electrical equipment using the Form C ‘Overhead Line Permit’. The purpose of the form is to make known to the COSS exactly which equipment is isolated and earthed, and upon which, or near to which, it is safe for the specified work to commence so far as the electrical equipment is concerned. NOTE: The issue of an Overhead Line Permit does not mean that train movements are stopped on the lines concerned and where necessary such arrangements are carried out in accordance with Rule Book GE/RT8000.

Overhead line switch Non-load-breaking device, mounted on an overhead line structure, for opening or closing an electrical circuit.

Overhead line under construction Overhead line equipment that is not complete and is in the process of being built. See ‘New overhead line equipment’

Overlap span Portion of track where the ends of two lengths of overhead line equipment are vertically graded and overlap so that the pantographs of electric trains can pass smoothly and without break of electrical contact from one contact wire to the next over the same track.

Pantograph Vertically extendable mechanism, mounted on insulators on the roof of electric traction units, the head of which carries carbon strips which, when the pantograph is raised, press against the underside of the contact wire and through which the electric current is collected from the overhead line equipment.

Permanently earthed section (PES)

A subsection of overhead line equipment permanently connected to earth, but treated as live OLE with respect to the requirements for isolation, testing, earthing and issue of Overhead Line Permits. In some circumstances electric trains can run under them (e.g. where installed beneath very low over-line bridges).

Point of Disconnection See ‘Module X definition’



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Point of Isolation The point at which separation of the electrical equipment from every source of electrical energy is achieved in such a way that disconnection and separation is secure. Note: Limits of isolations stated in isolation instructions in accordance with Network Rail standard NR/L2/ELP/27550

Possession Planning System (PPS)

A single system for the recording of national engineering and access requirements. These requirements are captured in real time as possessions, worksites and Temporary Speed Restrictions.

Portable earth Portable appliance of an approved type consisting of a length of sheathed flexible cable provided with electrical clamps at each end and used to establish electrical connection between overhead line conductors and earth. See Notes under ‘Earth’.

Protection wire Wire connected to the non-live side of insulators, and insulated from earth, to act as a path for any fault current from insulator flashover to the traction return circuit, where this is insulated from masts, etc. It is usually associated with isolating sections.

Public Area Areas to which the public lawfully have access and public standing surfaces, e.g. stations, public footpaths and level crossings etc.

Rail For London Infrastructure (Elizabeth Line) (RFLI)

The Elizabeth Line is primarily a high frequency tunnel railway which connects the Great Eastern Main Line in the East near Stratford Main Line Station with the Great Western Main Lines in the West near Paddington Main Line Station.

Rail joint bond Bond across a joint in the running rails.

Red bond Bond which, if disconnected, could result in either the bond or the equipment to which it is connected rising to a dangerous voltage.



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Residual electrical hazard (REH) Live equipment within the safe working limits, the location and nature of which are added to the Form C and briefed to the Controller of Site Safety, Safe Work Leader or other recipient of the Form C. NOTE: Examples include (but are not limited to):

• cross track feeders, • cable sealing ends, • adjacent energised equipment.

Return conductor (RC) Conductor attached to the overhead line equipment supporting structures, generally at the side of the track, which carries traction return current. In some areas it is carried on insulators and can also be used with booster transformers. At certain places it is sheathed with insulating material, but otherwise it is bare. In other areas it is not carried on insulators, is in electrical contact with the structures and also fulfils the function of an earth wire. See ‘Conductor’.

Return conductor-to-rail bond Bond from the traction return rail to the return conductor, often called a ‘mid point connection’. NOTE: These will usually be ‘Red bonds’.

Return screening conductor (RSC)

Insulated cable acting as a lineside longitudinal bond and connected at regular intervals to the traction return rail. For the purposes of this standard, a return screening conductor is considered as a continuity bond. See ‘Bond’. NOTE: A return screening conductor is provided for immunisation purposes and is normally in close proximity to signalling and telecommunications cables.

Riser Bare solid or stranded conductor run between the roof bushing or sealing end of a switching station and the overhead line equipment, not identified as a bare feeder on an isolation diagram. See also ‘Bare feeder’.

Risk assessment Structured process to evaluate the consequences of certain tasks or activities.



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Route Control Centre (RCC) Secure location accommodating apparatus for the remote control of the electric traction system and the staff who operate it.

Safe work leader (SWL) See ‘Controller of Site Safety (COSS)’.

Safe work limits Limits stated on an Overhead Line Permit (Form C), usually in the form of structure numbers, between which it is safe to work.

Sealing end Special insulator which secures the termination of a cable and is mounted on an overhead line structure or on a special structure.

Section Length of overhead line equipment between switching stations, or between a switching station and a terminal end.

Section insulator (SI) Insulation introduced between two sections of overhead line equipment to provide electrical separation except during the passage of pantographs and arranged so that pantographs can pass from one section to the other smoothly and without break of electrical contact.

Section switch

Overhead line switch which connects one subsection of overhead line equipment to another in normal feeding arrangements. NOTE: Switches can also have an ‘earth’ position.

Short circuit Introduction of a path of low resistance to electric current either between conductors which are connected to an electricity supply or between a live conductor and earth. NOTE: This will normally cause circuit breakers to switch off the electricity supply.

See ‘Circuit’.

Short portable earth Portable earth for use at designated earthing points which has orange coloured sheathing. It is a maximum of 1.5 metres long so as to minimise the risk of electric shock to persons at ground level should the earth end become detached accidentally. NOTE: Electrical clamps are fitted to each end that are suitable for attachment to the designated earthing point spigots using an insulated earthing pole.



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Siding switch

Overhead line switch which connects the overhead line equipment of a siding or group of sidings to another subsection of overhead line equipment in normal feeding arrangements. NOTE: Switches can also have an ‘earth’ position.

Spider plate Metal plate used as the point of common connection where a number of bonds from different connection points require to be commonly connected, or to provide a link in an unduly long bonding connection to facilitate maintenance and repair.

Stitch wire Conductor suspended from the catenary wire, and from which the contact wire is suspended, at overhead line supporting structures. See ‘Auxiliary catenary wire’

Structure to Rail bond Bond connecting the steelwork of an overhead line equipment structure, or bridge, or other metal structure, to the traction return circuit.

Structure mounted outdoor switchgear (SMOS)

Form of lineside switching station construction, using outdoor type switchgear mounted on steel masts.

Subsection Part of a section which can be isolated from all other lengths of overhead line equipment by the operation of overhead line switches. See ‘Section’.

Supervisory control and data acquisition (SCADA)

Electrical system for the remote control of electrical equipment at switching stations, motorised overhead line switches and other locations.

Supplementary conductor Conductor supported on insulators attached to the overhead line equipment supporting structures and which is connected to and in parallel with the catenary and contact wire for the purpose of reducing the electrical impedance of the overhead line equipment. See ‘Conductor’.

Supplementary Isolation Process (SIP)

A process for securing of points of disconnection using a unique padlock (creating a point of isolation)



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Switched off Disconnected and separated from all sources of electricity supply. NOTE: It is not possible to switch off the return conductors as they are part of the return current system. The Return Conductor will be considered as switched off if the associated booster transformers have been isolated from all sources of supply as part of the OLE isolation

In this standard ‘switched off’ refers to the disconnection and separation of those parts of the overhead line equipment normally live at 25 kV.

Switching station Site of lineside equipment arranged together to provide remote switching of the power supply to the overhead line equipment. NOTE: This includes feeder stations, autotransformer feeder stations, track sectioning cabins, track sectioning locations and autotransformer sites.

Tag Reminder device attached to an overhead line switch key which warns that the switch it relates to forms part of an isolation.

Tee-feed Single supply at a feeder station feeding overhead line equipment in both directions.

Temporary continuity jumper Length of sheathed flexible cable provided with electrical clamps for use as a temporary connection to bridge a gap, e.g. when the electrical continuity of the overhead line equipment is disturbed, or in a pipe, running rail or cable sheath. It has blue coloured sheathing.

Terminal end Point where the overhead line equipment is terminated both physically and electrically i.e. does not butt up to or overlap with any other overhead line equipment. NOTE: An overlap or cross-over or similar does not constitute a terminal end. However, in particular circumstances, a neutral section can be regarded as a terminal end (see Module 7).

Testing Using a voltage testing device. See ‘Voltage testing device’.

Track sectioning cabin (TSC) Building containing enclosed electrical switchgear and equipment which is arranged to connect together a number of sections of overhead line equipment.



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Track sectioning location (TSL) Compound containing outdoor electrical switchgear and equipment which is arranged to connect together a number of sections of overhead line equipment.

Traction current Flow of electricity to the electric traction units through the overhead line equipment and back through the return circuit.

Traction return circuit Path by which the traction current returns from traction units to the Feeder Station, incorporating the traction return rails, bonding connections, return screening conductors, return conductors and booster transformers. NOTE: Autotransformers and autotransformer feeders are also part of the traction return circuit but are not normally classed as such.

Train Register A book kept by signallers to record the passage of trains, transmission of bell signals and any exceptional circumstances.

Transformer Apparatus for supplying an alternating current at one voltage when fed with alternating current at another voltage.

Transposition bond (traction) Bond connecting two traction return rails where the traction return rail changes from one side of the track to the other.

Tripping Circuit breaker opening automatically when it detects a fault or an overload.

Uninsulated overlap span Overlap span arranged so that the two lengths of overhead line equipment are permanently electrically connected.

Voltage testing device Device which can be placed in contact with parts of the overhead line equipment normally live at 25 kV while being operated from ground level so as to check that the overhead line equipment under test has been switched off.

Weekly Operating Notice (WON) Contains information related to engineering work, alterations to track and signalling arrangements, local operating instructions and localised amendments

Yellow bond Bond which is required for track circuit integrity and normally also for traction return purposes.



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Standard and control document briefing note

Ref: NR/L3/ELP/29987 Issue: 5 Title: Working on or About 25 kV A.C. Electrified Lines Publication date: 01 December 2018 Compliance Date: 01 June 2019 Standard/Control Document Owner: Professional Head of Contact Systems (AC/DC) Non-compliance rep (Approver of TRACKER applications): Professional Head of Contact Systems (AC/DC) Technical lead/contact for briefings: Paul Thompson Senior Engineer Tel: 07920 508168 Purpose: This modular standard sets out a consistent approach to working on or about 25 kV electrified lines in relation to the dangers arising from proximity to live equipment. This overarching standard for the modules provides an introduction to the suite of modules and consistent use of terminology in the application of the standard.

This standard and each of its modules should be read in conjunction with all other standards relevant to the activity to be undertaken.

NOTE: Further requirements are contained in the Rule Book Module AC (GE/RT8000/AC) and Handbook 16 (GE/RT8000/HB16).

Compliance with this standard will mitigate the risks of electric shock or equipment damage resulting from uncontrolled approach to, or contact with, live overhead line equipment, high voltage bushings or cable sealing ends or through mishandling of conductors carrying electric traction current. Compliance with this standard will also mitigate the risks of injury or equipment damage resulting from incorrect or uncoordinated installation, testing, operation, maintenance, repair and dismantling of 25 kV a.c. electrified equipment

Scope: This standard applies all those required to work on 25 kV a.c. electrified lines, or so near to them that danger might arise, including persons who:

a) assess electrical risk;

b) plan, prepare and implement mitigations of electrical risk such as isolating, earthing and issuing of formal safety assurance documents;

c) install, test, operate, maintain, repair and dismantle 25 kV a.c. overhead line equipment and traction return systems;

d) use special tools to work on live overhead line equipment; or

e) work on rail vehicles or other equipment within 2.75 metres (9 feet) of overhead line equipment normally energised at 25 kV a.c.

f) work on or about any future sections of electrification on Network Rail controlled infrastructure and areas required to adopt a process for securing points of disconnection to form points of isolation to use the Supplementary Isolation Process (Module X).

g) plan, prepare and implement isolations on 750V d.c. overhead line equipment system (Sheffield Tram Train – Module Y)

h) work on or about 25kV Network Rail Infrastructure except areas undertaking the trial of the Single Approach to Isolations on 25kV a.c. infrastructure and Network Rail Infrastructure equipped with 1500V d.c. overhead line system.

It is applicable to Network Rail personnel and to Network Rail’s contractors.

To provide a consistent approach to working on or about 25 kV a.c. electrified lines, Train Operating Companies may, as best practice, apply this standard to infrastructure they control.

Overview of change The purpose of the standard update is to incorporate several outstanding Emergency Change (letters of instruction) and Temporary Variations.

a) Incorporating Modules X and Y and associated forms (previously published as Emergency changes) into the suite of modules.

b) Several misinterpretations in Modules 4, 5 and 7.

c) Introducing new control measures when it is not reasonably practicable for the Form C holder to attend the walkout as part of the production of the Isolation Details Form (IDF).

d) Changes to wording to improve clarity and consistency within the modules.

e) Aligning with the current version of the National Operating Instruction.

f) Detailing the interface with the Elizabeth Line (Cross Rail) and South Yorkshire Supertram Limited.

g) Detailing the requirement for an emergency switch-off if the electrical continuity of the running rail is interrupted as a result of a defect.

h) Defining that only interlocking long portable earths of the approved type shall be used aligning with safety advice NRA 18/16 issued on 25/09/2018.

i) Increasing the emphasis on installing interlocking long portable earths as part of RC only earthing

j) Additonal guidance included, detailing the method of application and removal of long portable earths.

Changes are made in line with current Emergency Changes and Temporary Variations. Copyright Network Rail Provided by IHS Markit under license with Network Rail Licensee=ISS Labour Limited /1121224080, User=Parsons, Stuart


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Detail of change

Section(s)/clause(s) Summary of changes

General • Reformatting in line with latest guidance • Contents tables renumbered • Rewritten in line with latest guidance (e.g. removal of “regarded”, “negligible”, “sufficient

knowledge” “under no circumstances” etc) • Rewritten in line with latest guidance (e.g. when referencing module clauses, the removal of

clause title “in accordance with clause X entitled ‘Clause Title’” • Removed self referencing (e.g. “read in conjunction with NR/L3/ELP/29987” and “read in

conjunction with NR/L3/ELP/29987 issue 4” • Updated scope of each module to reflect the alignment of two modules into the standard

suite and referencing areas undertaking the trial of the Single Approach to Isolations on 25kV a.c. infrastructure.

• Reference Rail For London Infrastructure Limited (Elizabeth Line) and South Yorkshire Supertram Limited (Sheffield Supertram)

• Incorporating all current emergency changes • Incorporating all current Temporary Variations

Main Standard • Issue Record updated • Reference Documentation updated to reflect current standards • 1 Purpose clarified statement • 2 Scope and Modules updated to reflect the alignment of two modules into the standard

suite and excluding areas undertaking the trial of the Single Approach to Isolations on 25kV a.c. infrastructure and 1500 d.c. overhead line systems.

• Index of modules updated to include issue No. and date and removed summary • 3 Definitions updated, re-ordered alphabetically and duplications removed

o Open circuit duplicated o Local Isolation duplicated o Buffer Section updated o Elizabeth Line (CrossRail) added o Short Circuit duplicated o Bare Feeder updated o PES updated o RC duplicated o Structure Bond updated

Module 1 • 1 Purpose clarified statement • 2 Scope including updated reference to scope of areas undertaking the trial of the Single

Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y. • 3 Management of Staff Training and Competence re-titled for clarity • 3.1, 3.2 and 3.3 Wording amended for clarify and referenced NR/L2/CTM/014 “Competency

and Training in OLE” • 4.2 Supply of Electricity ATF feeding arrangements added • 4.6 OLE obsolete statement removed • 4.8 Isolation Diagrams & Isolation Instructions clause amended for clarity. • 4.9 Operation of neutral section clause amended for clarity • 5.4 Broken of Displaced Equipment clause amended for clarity • 5.5 Return Conductor clause amended for clarity • 5.6 ATF Removal of statement regarding protective covering • 5.7 Rail Return Circuits clause amended for clarity • 5.8 Signals amended requirements regarding the assessment of signals • Appendix A ECR contact details updated


Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y. • 3.1 Areas of Reduced Wire Height clause amended for clarity removing RAGged red

clause. • 3.2 Use of On-Track Plant in Areas of Reduced Wire Height Added RAGged red clause

from clause 3.1 and referenced NR/L2/RVMP/0200 “Infrastructure Plant Manual” • 4.2 Work More than 2.75m from Live equipment paragraph broken down into bullet points • 4.3 Work More less than 2.75m from Live equipment paragraph broken down into bullet

points, added RAGged red clause from clause 3.1. Updated to align with TV36046 regarding DNO catenary systems.

• Appendix A Amended text reference to clause 4.2 & 4.3 Module 3 • 1 Purpose clarified statement

• 2 Scope including updated reference to scope of areas undertaking the trial of the Single Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y.

• 3.2 Work More than 2.75m from Live equipment clause amended for clarity • 3.3 Work More less than 2.75m from Live equipment clause amended for clarity • Appendix A 3 Clause amended to include spray • Appendix A 15 Amended clause regarding the assessment of signals • Appendix A 17.2 Reference Elizabeth Line (CrossRail) added • Appendix A 17.3 Reference South Yorkshire Supertram Limited added Copyright Network Rail

Provided by IHS Markit under license with Network Rail Licensee=ISS Labour Limited /1121224080, User=Parsons, StuartNot for Resale, 07/01/2019 09:06:56 MDTNo reproduction or networking permitted without license from IHS

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Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y. • 3.2 Overhead Line Conductors clause amended for clarity • 4.1 Traction Bonding – General, clause amended for clarity • 4.2 Red Bonds clause amended for clarity • 5.2.1 Red Bonds Broken or Disconnected – General, clause amended for clarity • 7.3 Interrupted Continuity of Running Rails amended clause stating that the ECO shall

initiate an emergency switch-off • 7.4.3 Removal of Rails clause amended for clarity • 7.5 Laying Out Rails alongside the Track Amended as per emergency change

NR/BS/LI/406 • 7.6 The Use of On-Track Machines Necessitating Bonding Alterations clause amended

for clarity • 7.7 Bonding of Cables, Pipes, Signal Rods and Wires clause amended for clarity • 8.1 Permanent Way – General amended for clarify and referenced NR/L2/ELP/27715 “OLE

Design Manual” and NR/L2/ELP/21088 “OLE Maintenance Parameters”. • 8.2 Sluing and Lifting Running Rails amended for clarify and referenced NR/L3/TRK/2049

“Track Design Manual” • 9 Automatic Power Control Inductors clause amended for clarify


Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y. • 3 Management of Staff Training and Competence re-titled for clarity • 3.1 Wording amended for clarify • 5.1 c) Actions to be Taken in Relation to Emergency Switch-Off Amended as per

emergency change NR/BS/LI/367 • 5.2 Actions Following the Initial Implementation clause amended for clarify • 5.5 Management of Emergency Switch-Off for DNO Infrastructure amended as per

emergency change NR/BS/LI/367 • 6 Work Arising at Short Notice Necessitating Isolation & Earthing of OLE clause

amended for clarify • 7 Removal of Objects From and Near to the OLE clause amended for clarify • 8 Use of Cranes, Plant and Equipment or Similar Apparatus Capable of Being

Extended clause amended for clarify • 11.1 Actions to be Taken Following the Tripping of the Traction Supply clause amended

for clarify Module 6 • 1 Purpose clarified statement


• 3 Assessment of Risk Before Attempting Work clause amended for clarify • 4 Principles for the Planning of Isolations alignment of three modules into the standard

suite and referencing NR/L3/ELP/25000 as per TV33926, TV33685 & TV32281 • 5.1 Request for OLE Permit clause amended for clarify • 5.3 Shared Switches clause amended for clarify • 5.4 Production of IPF clause amended for clarify • 5.5 Production of IDF clause separated into Production (5.5.1) and Checking (5.5.2).

Amended as per emergency change NR/BS/LI/396 and TV30667, clause amended for clarify.

• 5.6 Work Arising After the IPF is Issued clause amended for clarify • 5.8 Isolations Spanning a Neutral Section Forming the Boundary Between Electrical

Controls clause amended for clarify. • 5.9 Isolations Spanning a Section Insulator Forming the Boundary Between Electrical

Controls added new clause • 5.10 Planning of Alternative Arrangements for Issue of OLE Permits clause amended for

clarify • Appendix B amended for clarify


Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y. • 4.1 Types of Isolation – General clause amended for clarify • 4.2 OLE to be Treated as Live clause amended for clarify • 5 BTET aligned with current National Operating Instructions NR/NOI-005 – December 2017 • 6 Planning Isolation of OLE reference to Supplementary Isolation Process (SIP) added as

per TV33926, TV33685 & TV32281 • 7 Facilities for Isolating and Earthing the OLE reference to Supplementary Isolation

Process (SIP) added as per TV33926, TV33685 & TV32281 • 8.1 Switching Off the OLE – General reference to Supplementary Isolation Process (SIP)

added as per TV33926, TV33685 & TV32281 • 8.2 Shared Switches reference to Supplementary Isolation Process (SIP) added as per

TV33926, TV33685 & TV32281. Amended as per emergency change NR/BS/LI/367 and clause amended for clarify

• 8.3 Alternative Feed Switch Reference to Supplementary Isolation Process (SIP) added as Copyright Network Rail Provided by IHS Markit under license with Network Rail Licensee=ISS Labour Limited /1121224080, User=Parsons, Stuart


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per TV33926, TV33685 & TV32281 • 8.4 Normally Open Switches reference to Supplementary Isolation Process (SIP) added as

per TV33926, TV33685 & TV32281 • 8.6.1 Isolating Risers, Bushings and Cable Sealing Ends – General clause amended for

clarify • 8.7 Isolating Bare Feeders clause amended for clarify • 8.8 Isolating SMOS clause amended for clarify • 8.9 Isolating ATF systems clause amended for clarify • 8.10.2 Other Work clause amended for clarify • 8.11 Isolating Structure Earthing Devices clause amended for clarify • 8.13.1 Electrical Subsections in Sidings and Abutting Subsections clause amended for

clarify • 8.13.2 Electrical Subsections at Electric Traction Depots, Electric Inspection and

Cleaning Depots clause amended for clarify • 9.1 Issue and Receipt of Form B – General clause amended for clarify • 9.2 Issue of Form B Spanning a Neutral Section Forming the Boundary between

Electrical Controls clause amended referencing Elizabeth Line (CrossRail) • 9.3 Issue of Form B Spanning a Section Insulator Forming the Boundary Between

Electrical Controls added complete clause • 9.4 Two or More Nominated Persons Within the Same Isolation clause amended for

clarify • 10 Testing OLE clause amended for clarify • 11.1 Earths at the Isolation Limits amended as per emergency change NR/BS/LI/367 • 11.2 Intermediate Earths and Temporary Continuity Jumpers Re-titled for clarity • 11.2.2 Intermediate Earths amended as per emergency change NR/BS/LI/367 and clause

amended for clarify • 11.3.2 Continuity Jumpers clause amended for clarify • 11.4 Altering the Location of Earths clause amended for clarify • 11.5 Disturbance, Interference or Removal of Earths clause amended for clarify • 12.1 Earthing of Earth Wires, Return Conductors and Booster Transformers – General

clause amended for clarify • 12.2 Application of Earths clarification regarding the application of long portable earths,

amended as per emergency change NR/BS/LI/367 and clause amended for clarify • 12.5.2 Case A – Where an OLE Isolation is Required clause amended for clarify • 12.5.3 Case B – Where an OLE Isolation is Not Required clarification regarding the

application of long portable earths and clause amended for clarify • 12.10 a) Broken Sheathed Return Conductor Carried on Insulator RAGged changed to

amber from Green • 12.6 Sheathed Return Conductor clause amended for clarify • 12.7 Broken Bare Return Conductors on Insulators clause amended for clarify • 12.10 b) Broken Sheathed Return Conductors on Insulators RAGged changed to amber

from Green • 12.11.2 Where Spider Plates are Fitted clause amended for clarify • 12.12 a) Booster Transformer RAGged changed to amber from Green • 12.12 b) Booster Transformer RAGged changed to amber from Green • 16 Earthing the Connections between a Return Conductor Busbar and Rail clause

amended for clarify • 18 Earthing the Connection Between a Structure carrying an Earthing Device or a

Harmonic Damper and Rail clause amended for clarify • 19.1 Issue of OLE Permit clause amended for clarify • 26 Carrier Wire Neutral Section added from the withdrawn Module W • Appendix A ECO boundaries updated • Appendix A General Addressing emergency change NR/BS/LI/406 • Appendix B List of Model Forms Form NC title updated


Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y. • 3 Management of Staff Training and Competence re-titled for clarity • 4.1 Local Isolation in Sidings – Principles clause amended for clarify • 6.1 Isolation Entirely Within a Depot Boundary clause amended for clarify


Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y. • Minor general corrections • 4.3 Isolation Diagrams and Instructions reference NR/L2/ELP/27550 “Traction Power

Isolation Documentation” Module 10 • 1 Purpose clarified statement


• 3 General clause amended for clarify • 4 Voltage Testing Devices Updated to align with Safety Alert NRA 18/14 using proving

units. • 7.3 Application of Long Portable Earths clarification regarding the application of long Copyright Network Rail

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portable earths Updated to provide additional guidance regarding the application of long portable earths. Updated to align with Safety Alert NRA 18/16 using interlocking long portable earths.

• 7.4 Removal of Long Portable Earths clarification regarding the removal of long portable earths Updated to provide additional guidance regarding the removal of long portable earths

• 7.5 Additional Precautions to be Taken with Long Portable Earths amended to include RC only earthing

• 9 Earthing of Return Conductors with Long Portable Earths amended to include RC only earthing


Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y. • 4.1 Use of Live Line Tools and Live Line Measuring Devices clause amended for clarify • 4.2 Live Line Tools clause amended for clarify referenced NR/L3/ELP/27237 “OLE Work

Instruction” • 4.3 Live Line Measuring Devices clause amended for clarify referenced NR/L3/ELP/27237

“OLE Work Instruction” • 7.2 Access to Switching Stations and Compounds clause amended for clarify referenced

NR/L2/CTM/018 “Competency and Training in Traction Power Distribution” • 7.4 Disturbance of Interference with or Removal of Earths clause amended for clarify • 7.6 Working on Connections to Bushings or Cable Sealing Ends updated to detail issue

of HV permit • 7.7 Working on Feeder Switches updated to detail issue of HV permit • 7.12.13 RSC clarification regarding RSC repair


Approach to Isolations on 25kV a.c. infrastructure, Modules X and Y. • 3 Management of Staff Training and Competence re-titled for clarity

Module W • General Module withdrawn Module X • General Addressing TV24774, TV33926, TV33685, TV36578 & TV32281

• General Used the term Point of Isolation • 8 Management of Staff Training and Competence Clarification of training for Nominated

Person, Authorised Persons and Electric Control Operators Module Y • General Addressing emergency change NR/BS/LI/406

• General Minor corrections Form GBSIP B • Title amended

• Part 3 added requirement for security removal Form GBSIP STED • Title amended Form AT • Included Text “message number” in Part 5 Form IDF • Included text “Isolation Instruction Reference” Form NC • Title amended Form WSVF • Form contained in withdrawn Module W Form WIPF • Form contained in withdrawn Module W Form WIDF • Form contained in withdrawn Module W Form WB • Form contained in withdrawn Module W Form WSTED • Form contained in withdrawn Module W Form WLOAC • Form contained in withdrawn Module W

Reasons for change The updated standard incorporates several outstanding Emergency Change (letters of instruction) and Temporary Variations. There is also alignment to address recommendations from safety related events and ORR authorisation conditions on new electrification schemes . Affected documents:

Reference

NR/L3/ELP/29987 ISSUE 4

NR/L3/ELP/29987/01 ISSUE 4










Impact

Superseded

Superseded

Superseded

Superseded

Superseded

Superseded

Superseded

Superseded

Superseded

Superseded

Superseded Copyright Network Rail Provided by IHS Markit under license with Network Rail Licensee=ISS Labour Limited /1121224080, User=Parsons, Stuart


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NR/L3/ELP/29987/W

NR/L3/ELP/29987/X ISSUE 1

NR/L3/ELP/29987/Y ISSUE 1

NR/L3/ELP/29987/MANUAL ISSUE 4

NR/L3/ELP/29987/FORM AT

NR/L3/ELP/29987/FORM IDF

NR/L3/ELP/29987/FORM NC

NR/L3/ELP/29987/FORM GBSIP B

NR/L3/ELP/29987/FORM GBSIP STED

NR/L3/ELP/29987/FORM WSVF

NR/L3/ELP/29987/FORM WIPF

NR/L3/ELP/29987/FORM WIDF

NR/L3/ELP/29987/FORM WB

NR/L3/ELP/29987/FORM WSTED

NR/L3/ELP/29987/FORM WLOAC

NR/BS/LI/367

NR/BS/LI/393

NR/BS/LI/401

NR/BS/LI/406

NR/BS/LI/408

Superseded

Superseded

Withdrawn

Superseded

Superseded

Superseded

Superseded

Superseded

Superseded

Superseded

Superseded

Withdrawn

Withdrawn

Withdrawn

Withdrawn

Withdrawn

Withdrawn

Withdrawn

Withdrawn

Withdrawn

Withdrawn

Withdrawn

Briefing requirements: Will Briefing Management System be used to deliver the briefing to posts listed below? No Technical briefings are given to those who have specific responsibilities within this standard/control document. Awareness briefings are given to those who might be affected by the content but have no specific responsibilities within the standard/control document. Details of the briefing arrangements are included in the associated briefing programme. All posts identified for briefing must be as described in OrgPlus.

Briefing (A-Awareness/ T-Technical)

Post Function

Responsible for cascade briefing?

Y/N

A Infrastructure Maintenance Delivery Manager Network Operations

N

A Head of Maintenance Delivery Network Operations

N

T Programme Manager Network Operations

Y

A Route Asset Manager (E&P) Network Operations

Y

T Senior Asset Engineer (E&P) Network Operations

N

A Route Asset Manager (other disciplines) Network Operations

Y

A Senior Asset Engineer (other disciplines) Network Operations

N

T Infrastructure Maintenance Engineer Network Operations

Y

T E&P Maintenance Engineer Network Operations

Y

T Assistant E&P Maintenance Engineer Network Operations

Y

T Section Manager (OLE) Network Operations

Y

T Section Supervisor / Working Supervisor (OLE) Network Operations

Y Copyright Network Rail Provided by IHS Markit under license with Network Rail Licensee=ISS Labour Limited /1121224080, User=Parsons, Stuart


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A Team Leader (OLE) Network Operations

N

A Technician / Operative (OLE) Network Operations

N

T Isolation Planners (Route) Network Operations

N

A Maintenance Engineers & Assistant Maintenance Engineers (other disciplines)

Network Operations Y

A OTP Specialist Network Operations

N

A Section Manager (other disciplines) Network Operations

Y

A Section Supervisor/ Working Supervisor (other disciplines) Network Operations

Y

A Team Leader (other disciplines) Network Operations

N

A Senior Commercial Manager Network Operations

N

A Contracts and Procurement Manager Network Operations

N

A Head of Route Health, Safety and Environment Network Operations

Y

A Workforce Health Safety & Environment Advisor Network Operations

Y

T Section Planner (/Administrator) (OLE) Network Operations

Y

A (Principal, Senior) Technical Officer Network Operations

Y

A Infrastructure Maintenance Services Manager Network Operations

N

A Current Operations Manager Network Operations

Y

A Route Control Manager Network Operations

Y

A Route Planning Manager Network Operations

Y

A Lead Planner (Access) Network Operations

Y

A Planning Specialist (Access) Network Operations

Y

T Engineering Assurance Director Investment Projects

Y

T Technical Head of Discipline (E&P) Investment Projects

Y

T Programme Engineering Manager Investment Projects

Y

T Senior Project Engineer (E&P) Investment Projects

Y

T Project Engineer (E&P) Investment Projects

N

A Senior Project Engineer (other disciplines) Investment Projects

Y

A Project Engineer (other disciplines) Investment Projects

N

T Designated Project Engineer Investment Projects

Y

A (Senior) Programme Engineering Manager Investment Projects

Y

A (Principal, Senior) Design Engineer Investment Projects

Y

A Head of Operations Principles & Standards STE Y



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T Electrical Control Room Operator Manager Network Operations

Y

T Electrical Control Room Operators Network Operations

N

A Programme Engineering Manager (Works Delivery) Network Operations

Y

A Programme Manager (Works Delivery) (All disciplines) Network Operations

Y

A Project Manager (Works Delivery) (All disciplines)

Network Operations N

A Senior Incident Officer Network Operations

Y

A Incident Officer Network Operations

N

A Programme Engineering Manager (OLE Condition Renewals- OCR) Route Services Y

A Senior Project Engineer (OCR) Route Services Y

A Project Engineer / Assistant Project Engineer Route Services Y

A Section Manager / Section Supervisor / Team Leader / Technician – OCR Route Services Y

A Route Logistics Manager Route Services Y

A Logistics Facility Manager Route Services Y

A Service Delivery Manager Route Services Y

A Project Operations Manager Route Services Y

A Logistics Specialist Route Services Y

A Head of Delivery (Telecoms) Digital Railway Y

A Head of Operations (Telecoms) Digital Railway Y

T Professional Head of Contact Systems AC/DC STE Y

T Principal Engineer (Contact Systems) STE Y

T Senior Engineer / Engineer / Assistant Engineer (Contact Systems) STE N

T Professional Head of Distribution HV/LV STE Y

A Principal Engineer (Distribution) STE Y

A Senior Engineer / Engineer / Assistant Engineer (Distribution) STE N

T Engineering Expert (M&E) STE Y

A Professional Heads (other disciplines) STE Y

A Principal Engineers (other disciplines) STE N

A Engineering Experts (other disciplines) STE N

NOTE: Contractors are responsible for arranging and undertaking their own Technical and Awareness Briefings in accordance with their own processes and procedures.



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Ref: NR/BS/LI/419 Issue date: 13 February 2019 Compliance date: 01 June 2019 Expiry date: 13 February2020

This document is the property of Network Rail. It shall not be reproduced in whole or part nor disclosed to a third party without the written permission of Network Rail. Copyright 2019 Network Rail.

Uncontrolled copy once printed from its electronic source.

Published and Issued by Network Rail, 2nd Floor, One Eversholt Street, London, NW1 2DN.

Page 1 of 5

Emergency change: NR/BS/LI/419 Standard/control document affected: NR/L3/ELP/29987 [Working On or About 25 kV a.c Electrified Lines]

The affected standard/control document will be reviewed and up-issued before this emergency change expires on 13th February 2020. For further information contact: Philip Doughty, Professional Head of Contact Systems (AC/DC), 07825969253.

1 Reason for issue Module 4, clause 7.3 of NR/L3/ELP/29987 defines the control measures to be implemented if the electrical continuity of the traction return running rail is interrupted. Recently feedback has been received from both Network Rail Operations and Maintenance that it is not reasonably practicable due to the operational impact for the ECO to implement an Emergency Switch-Off prior to the application of a temporary bond across the break in the rail. This emergency change removes the requirement for an Emergency Switch-Off and introduces the appropriate safe methods for the application of a temporary bond across a broken rail joint which is practicable to implement and assists in managing the safety risk associated with dangerous voltages that might be present as a result of a broken and/or parted rail.

2 Scope This emergency change is applicable to all Network Rail controlled 25 kV a.c electrified lines.

3 Changes

Clause/sub-clause Change

Module 4 clause 7.3

The current wording of Module 4 Section 7.3 is to be replaced with the wording detailed in this emergency standard change. The changes remove the requirement for an Emergency Switch-Off when applying a temporary bond. Current wording:

If the electrical continuity of the running rail is interrupted as a result of a defect, e.g. a broken and/or parted rail, this shall be reported immediately to the ECO. The ECO shall initiate arrangements for an Emergency Switch-Off in accordance with Module 5, clause 5 prior to applying a temporary bond across the break in the rail.



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Ref: NR/BS/LI/419 Issue date: 13 February 2019 Compliance date: 01 June 2019 Expiry date: 13 February 2020

Page 2 of 5

If the rails are broken or separated, a dangerous voltage might be present and they shall not be touched until the requirements of Module 7 clause 14 have been met.

Where clamping of a broken and/or parted traction return rail is to be undertaken, a temporary bond shall be first be applied across the break in the rail.

If safe running of trains is affected, the defect shall be reported to the Network Rail Route Control, signal box Supervisor or Signaller.

As part of planned works where a traction return rail is to be cut, a temporary bond shall first be applied across the position where the cut is to be made. The bond shall be in accordance with Network Rail instructions. The bond shall be left in position until the continuity of the traction return rail is again continuous.

New wording:

If the electrical continuity of the traction return running rail is interrupted as a result of a defect, i.e. a completely broken and/or parted rail, this shall be reported immediately to the ECO.

A dangerous voltage might be present across the rail break.

Where clamping of a broken and/or parted traction return rail is to be undertaken a temporary bond shall first be applied across the break in the rail.

Temporary bonds shall be applied only by authorised staff and both ends of the bond shall not be touched simultaneously.

The DUE&PME, or delegate, shall assess the appropriate safe method of working for applying the temporary bond based on the following criteria:

a) A temporary bond shall be applied without a switch-off (de-energisation) provided that:

1) the integrity of the traction return system including adjacent track to track and/or rail to rail bonding arrangements have been visually verified against an approved bonding plan or schedule 400m either side of the broken and/or parted rail; or,

2) an aerial earth wire is installed, and the integrity of these electrical connections have been visually verified either side of the parted rail.

b) Where the bonding arrangement or electrical connections cannot be verified, the ECO shall arrange for a block to electric trains (BTET) or a switch-off (de-energisation) of the complete electrical section for the affected track in accordance with Electric Control Instructions whilst the temporary bond is installed.

Single track areas without an aerial earth wire and with single rail traction return shall meet the requirements of clause 7.3 b).

Task risk control sheet NR/L3/MTC/RCS0216/OLE11 states the requirements for the application of temporary bonds.

A switch-off of the OLE is referred to as ‘de-energisation’ and shall be implemented by the ECO. This does not constitute an isolation or emergency



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Page 3 of 5

switch-off and the overhead line equipment shall be treated as live.

As part of planned works where a traction return rail is to be cut, a temporary bond shall first be applied across the position where the cut is to be made. The bond shall be in accordance with Network Rail instructions. The bond shall be left in position until the continuity of the traction return rail is again continuous.



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Copyright N

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4 Recipients

Name Post Carl Hunt Route Asset Manager [E&P] Anglia Martin O’Connor Route Asset Manager [E&P] LNW (N) Dean Chauke Route Asset Manager [E&P] LNW (S) Colin Lamb Route Asset Manager [E&P] Scotland Richard Sperring [Acting] Route Asset Manager [E&P] Western Duncan Brown [Acting] Route Asset Manager [E&P] LNE Nigel Wheeler Route Asset Manager (E&P) Wessex Mark Proctor Route Asset Manager (E&P) Kent & Sussex Peter Smith-Jaynes Route Asset Manager (E&P) Wales Mark Davies Route Asset Manager (E&P) East Midlands John Fry Technical Head of Discipline, IP Mark Dobson Programme Engineering Manager (OCR) Paul Ashton Head of Operations Principles & Standards

5 Details of briefing or cascade communication process • The Head of Contact Systems (AC/DC) will brief the Route Asset Managers (E&P) and the

Technical Head of Discipline IP;• Route Asset Managers (E&P) are responsible for briefing into Network Operations Delivery Units.

The briefing shall include all Nominated Persons, Authorised Persons, Isolation Planners and E&PMaintenance Engineers (25kV a.c. areas);

• The Technical Head of Discipline (IP) is responsible for briefing into the Infrastructure Projectsorganisation. The briefing shall include all Nominated Persons, Authorised Persons, IsolationPlanners, Programme Engineering Managers (E&P), Project Managers (E&P);

• Programme Engineering Manager (OCR) is responsible for briefing all OCR staff. The briefing shallinclude all Nominated Persons, Authorised Persons and Isolation Planners;

• Head of Operations Principles & Standards is responsible for providing an awareness brief to allElectrical Control Room Operator Managers and Electrical Control Room Operators.



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The following information is associated with Network Rail Standard: NR/L3… · 2019. 7. 3. ·...

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