This standard covers metal-clad (MC) switchgear containing@ but not limited to@ devices such as power circuit breakers@ other interrupting devices@ switches@ control@ instrumentation and metering@ and protective and regulating equipment. It includes@ but is not specifically limited to@ equipment for the control and protection of apparatus used for power generation@ conversion@ and transmission and distribution.This standard is concerned with enclosed@ rather than open@ indoor and outdoor switchgear assemblies rated above 1000 V ac. Included is equipment that is part of primary and secondary unit substations. Gas insulated substation equipment is not included.