scope:

What this book is for

This book details instructions for:

• switching traction current on and off

• operating Short Circuiting Devices (SCDs) and Current Rail Indicator Devices (CRIDs)

• detecting earth faults and dealing with loss of high voltage supply.

It also details instructions for:

• switching traction current on safely at the start of Traffic Hours and off at the end of Traffic Hours

• switching traction current on and off when taking possessions

• operating section, isolating, changeover and coupling switches to change the management of traction current

• detecting and dealing with Direct Current (DC) traction earth faults

• undertaking planned power supply testing, reconfiguration and maintenance.

It also contains instructions for switching traction current off due to an incident or emergency, and switching traction current back on again once the incident or emergency is over:

• on running lines, and

• in depots.

Who needs this book

You will need this book if you are carrying out the activities of:

• a controller

• a power control room operator

• a signaller

• a station supervisor

• a possession master

• a protection master

• a track access controller

• a duty depot manager

• a duty operations engineer

• London Underground Control Centre staff

• a train operator

• a track landlord

• a service manager

• a shift supply engineer

• an LU contractor

• Access Reservation Agency staff

• a senior operating officer

• a planner

• an engineer (electrical).

You will also need this book if you are:

• staff who are required to operate traction current switches, CRIDs or SCDs

• any competent person who needs traction current to be switched off in an emergency.