scope:

This module states the requirements for the isolation and earthing of overhead line equipment where local isolations are specified in the isolation instructions.

It is applicable to Network Rail personnel and to Network Rail's contractors. It is also applicable in relevant part to Train Operating Companies having locally controlled 25 kV a.c. overhead lines which abut those controlled by Network Rail.

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 in full on infrastructure they control.

This Standard also includes:

• Work on or about 25kV electrified lines except 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.

• 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).

• Planning of isolations, testing and earthing of overhead line equipment on Network Rail controlled infrastructure equipped with 750V d.c. overhead line system (Sheffield Tram Train - Module Y).

Purpose

Compliance with this module will promote safe operation of the 25 kV a.c. electrification system and produce consistent implementation of secure isolation procedures at locally controlled sidings and depots.

NOTE: Further requirements for working on or about the electrified lines are contained in the Rule Book Module AC (GE/RT8000/AC) and Handbook HB16 (GE/RT8000/HB16).