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Motor Control Centers (MCC) are a modular assembly which motor control units called buckets are installed, each bucket is intended to control a motor. It acts as a central switchgear panel for the control of multiple motors in an industrial facility. Motor control centers contain a bus which provides power for all of the individual buckets. A control center is typically constructed as a vertical metal cabinet with openings for each bucket and a power bus running behind each one. In a factory it is common to locate multiple MCC's in a temperature controlled room for the purposes of cooling and a cleaner operating environment.