NR NR/L2/SIGELP/50000/MODA ISSUE 1 PDF

This module defines the minimum inspection and maintenance frequencies for the tasks contained within work instructions referenced from NR/L3/SIGELP/50001.

This module also contains the criteria for the application of risk based maintenance on signalling power supply equipment above 175 V ac.

Note: This module affects the following signalling power supply equipment on Network Rail managed Infrastructure:

• Signalling Power supply equipment above 175 V ac in equipment housings including FSPs, location cases, relay rooms, REBs, etc.

• Signalling Power supply cabling and cable routes

• Insulation Monitoring equipment on signal power supplies above 175 V ac

• Interrupter cabling

• Temporary protective measures

• Electronic Protection Relays installed on signalling power supply equipment above 175 V ac

• Distribution Interface Transformer Equipment

Note: The maintenance of Principal Supply Points is excluded from this document.