BS EN 50123-1:2003 - Page 2

Railway applications. Fixed installations. D.C. switchgear. General | Status: Confirmed, Current

1 Scope 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