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IEEE 27

1974 Edition, February 28, 1974

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STANDARD FOR SWITCHGEAR ASSEMBLIES INCLUDING METAL-ENCLOSED BUS; CONSOLIDATED EDITION; SUPPLEMENTS C37.20A, C37.20B AND C37.20C



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Description / Abstract:

This standard covers assemblies of switch-gear devices such as switches, interrupting devices, control, instrumentation and meter- ing, protective and regulating equipment, enclosed bus with associated interconnections, enclosures, and supporting structures. It includes, but is not specifically limited to, equipment for the control and protection of apparatus used for power generation, conversion, transmission and distribution, such as:

Metal-clad switchgear

Station-type cubicle switchgear

Metal-enclosed low-voltage power circuit breaker switchgear

Metal-enclosed interrupter switchgear

Metal-enclosed bus

Switchboards, including combined boiler- turbine-generator boards and miscellaneous power plant boards Assembled switchgear components of unit substations

Basically, this standard is concerned with enclosed, rather than open, switchgear assemblies. It does not apply to equipment covered by industrial control standards, communication switchboards and communication breaker switchgear switching equipment, or switchboards for use on board ships.