scope:

This standard applies to LU their suppliers/contractors and 3rd parties.

This standard applies to all LV electrical distribution, sub-distribution, final circuits and installations on LU premises as follows:

a) For installations supplied from the LU Low Voltage Alternating Current (LVAC) supplies, from the Delivery Point as defined by LU standard S1105

b) For Tunnel Lighting controls supplied from the LU Direct Current (DC) traction conductor rail

c) For installations supplied by a Distribution Network Operator (DNO) to LU dedicated local High Voltage (HV)/LV transformers, from the point of isolation on the secondary side of the transformer

d) For installations supplied from a DNO LVAC supply, from and including the outgoing cable at the DNO cut-out

e) For installations supplied from self generating power supplies, including the power source.

Note: This standard does not apply to Off Line Battery Inverters (OLBIs), DC traction systems and signalling supplies at 33.3Hz and 125Hz.

Purpose

To ensure that Low Voltage (LV) electrical sub-distribution systems and installations on London Underground (LU) premises are designed, installed, maintained and operated in a safe and effective manner.