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Automatic transfer switches must also be operated monthly. The monthly test. consists of electrically operating the transfer switch from the standard position to. the alternate position and then a return to the standard position.
Because MCCs are tested to withstand their short circuit current rating for only three cycles per UL 845, Motor Control Centers, the instantaneous function of the solid-state trip unit is necessary to ensure that the MCC does not endure a fault much longer than the short circuit duration time of three cycles.