The seismic capacity for the equipment class of medium voltage switchgear (MVS) assemblies may be based on earthquake experience data. This equipment class consists of one or more circuit breakers and associated control relays and instrumentation mounted in a sheet metal enclosure. The equipment class includes electrical switching and fault protection circuit breakers for systems powered between 2400 and 4160 volts.
Office of Environment, Health, Safety & Security
October 21, 2026
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The seismic capacity for the equipment class of medium voltage switchgear (MVS) assemblies may be based on earthquake experience data. This equipment class consists of one or more circuit breakers and associated control relays and instrumentation mounted in a sheet metal enclosure. The equipment class includes electrical switching and fault protection circuit breakers for systems powered between 2400 and 4160 volts. Medium-voltage circuit breakers are mounted in sheet metal cabinets which are bolted together, side-by-side, to form a switchgear assembly.