BS EN 50123-1:2003

This standard BS EN 50123-1:2003 Railway applications. Fixed installations. D.C. switchgear is classified in these ICS categories:

• 29.130.99 Other switchgear and controlgear
• 29.280 Electric traction equipment

The EN 50123 series specifies requirements for d.c. switchgear and controlgear and is intended to be used in fixed electrical installations with nominal voltage not exceeding 3 000 V d.c., which supply electrical power to vehicles for public guided transport, i.e. railway vehicles, tramway vehicles, underground vehicles and trolley-buses.

Part 1 specifies general requirements.

The other parts are covering

Part 2	D.C. circuit breakers,
Part 3	Indoor d.c. disconnectors, switch-disconnectors and earthing switches,
Part 4	Outdoor d.c. disconnectors, switch-disconnectors and earthing switches,
Part 5	Surge arresters and low voltage limiters for specific use in d.c. systems,
Part 6	D.C. switchgear assemblies,
Part 7-1	Measurement, control and protection devices for specific use in d.c. traction systems – Application guide,
Part 7-2	Measurement, control and protection devices for specific use in d.c. traction systems – Isolating current transducers and other current measuring devices,
Part 7-3	Measurement, control and protection devices for specific use in d.c. traction systems – Isolating voltage transducers and other voltage measuring devices