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a) Metal-enclosed low-voltage power circuit breaker switchgear assemblies, as defined in IEEE Std C37.20.1™ 3
b) Metal-clad switchgear assemblies, as defined in IEEE Std C37.20.2™
b) Metal-enclosed bus, as defined in IEEE Std C37.23™
c) Metal-enclosed interrupter switchgear assemblies (1 kV to 38 kV), as defined in IEEE Std C37.20.3™
Purpose
The purpose of this document is to provide amplification of the general requirements of IEEE Std 323™- 2003 as they apply to the specific features of Class 1E switchgear and metal-enclosed bus assemblies. Where differences exist between this document and IEEE Std 323-2003, this document takes precedence insofar as switchgear and metal-enclosed bus assemblies are concerned.