Single Approach to Isolation (SAI) ac

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” – which will replace (in the trial area only) the existing procedures used when working on or near OLE (NR/L3/ELP/29987, also known as the ‘Green Book’).

The new procedures focus much more on risk assessment and avoiding electrical danger in the first place. In addition, the project will introduce enhanced training for all people working on or near OLE and new equipment for use when marking out safe working limits. Having one set of procedures for use anywhere on the network, people will always be clear on ‘what and how’ they should be working when on the operational railway with overhead electrification, no matter where in the country they are working.

The new procedures will be trialled in the Rugby DU area (Ashton, just north of Hanslope Junction- Hillmorton) of NW and C Region. The trial will commence in Autumn 2019 and first ‘Boots on Ballast’ Earthed Isolotion using the new procedures in January 2020. If the trial is successful, we plan to ‘roll out’ the new procedures nationally from May 2020.


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