scope:

This document applies to all persons responsible for planning or undertaking preventive or reactive inspection and maintenance activities on 25 kV a.c. or 1.5 kV d.c. overhead line electrification equipment.

This document describes the agreed method for Network Rail to demonstrate compliance with the ORR guidance to the common safety method on risk evaluation and assessment. Variations from the process within this document can only be granted where an alternative method of risk assessment is produced and agreed.

Purpose

This document describes the process followed in order to apply a risk based maintenance analysis to Overhead Line Equipment (OLE) by assessing the risk of equipment failure in between maintenance interventions to produce the optimum frequencies for inspections and defect removal.

The document is to be used in conjunction with any other relevant, equipment specific, Network Rail maintenance standards.