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 switchgearMetal-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.