The seismic capacity for the equipment class of motor control centers (MCCS) may be based on earthquake experience data. This equipment class includes control and electrical fault protection systems for motors powered at 600 volts or less (typically 480 volts).
Office of Environment, Health, Safety & Security
October 21, 2026
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The seismic capacity for the equipment class of motor control centers (MCCS) may be based on earthquake experience data. This equipment class includes control and electrical fault protection systems for motors powered at 600 volts or less (typically 480 volts). Motor controllers are mounted in sheet metal cubicles with controller cubicles typically assembled into stacks which are lined up side-by-side and bolted together to forma motor control center. This equipment class includes motor controllers mounted in individual cubicles on racks or walls as well as freestanding MCCS.