IEEE - The Institute of Electrical and Electronics Engineers@ Inc.
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IEEE C37.20.1A-2005
Scope
This standard covers metal-enclosed low-voltage power circuit breaker switchgear assemblies containing@ but not limited to@ such devices as low-voltage power circuit breakers (fused or unfused); other interrupting devices; switches@ control@ instrumentation@ and metering; and protective and regulating equipment.This standard is concerned with enclosed@ rather than open@ indoor and outdoor switchgear assemblies. It includes types of equipment that are part of secondary unit substations. It does not apply to equipment covered by industrial control standards@ communication switchboards@ communication switching equipment@ switchboards for use on board ships@ or dead-front distribution switchboards.In this standard@ metal-enclosed low-voltage power circuit breaker switchgear shall be called L V switchgear. For LV ac switchgear@ the voltage shall be 1000V or below; for LV dc switchgear@ the voltage shall be 3200 V or below.
IEEE C37.20.1A-2005 history
2005IEEE C37.20.1A-2005 Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear