scope:

This document covers the provisions necessary to enable the procedures to be followed within those areas and for those tasks to which local isolation instructions apply. It amplifies, but in no way modifies the requirements of NR/SP/ELP/29987.

The requirements of this document need not be applied retrospectively but whenever alterations are made to an existing electrification they shall be applied where reasonably practicable.

Purpose

At certain locations e.g. sidings and electric traction depots, work on electric traction, loading or unloading of wagons, or maintenance of adjacent equipment (e.g. carriage washing plants), requiring isolation and earthing of the O.L.E., is carried out at frequent intervals.

To facilitate this work Modules 8 and 12 of NR/SP/ELP/29987 Working on or about 25kV A.C. Electrified Lines permits local isolations to be carried out without using the procedure contained in Module 7.

At all such locations "Local Isolation and Earthing Instructions" shall be prepared to cover the detailed procedures to be followed when the O.L.E. is to be isolated and earthed to allow local isolations to be carried out.