Single Approach to Isolation (SAI) Alternating Current (AC)

SAI Project Overview

The SAI (a.c.) Project will trial and implement new operating procedures for Overhead Line Equipment (OLE). These procedures are set out in a new standard – NR/L3/ELP/25000, Issue 1 “Electrical Safety Measures for Working on the Operational Railway with Overhead Electrification“. The procedures in the new standard will replace the procedures set out in existing standard NR/L3/ELP/29987, also known as the ‘Green Book’.

The new procedures have significant emphasis on risk assessment and the avoidance of exposure to electrical danger. To support this, the project will introduce enhanced training for all workforce on or near OLE, and new equipment for use when marking out safe working limits. By adopting one set of procedures for use across the whole network, the workforce will have clarity on the procedures they should follow when working on the operational railway with overhead electrification.

The new procedures will be trialled in the Rugby Delivery Unit (DU) area, specifically Ashton, which is just north of Hanslope Junction to Hillmorton of North West and Central (NW and C) Region. The trial will commenced in Autumn 2019 and the first ‘boots on ballast’ Earthed Isolation using the new procedures was undertaken in January 2020.


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