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IEC 61992-1 Ed. 2.0 b:2006
Railway applications - Fixed installations - DC switchgear - Part 1: General
IEC 61992 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.
International Electrotechnical Commission [iec]

