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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.
The SERIES 300 is listed to UL 1008 standard for Transfer Switch. Equipment and CSA standard C22.2 for automatic transfer switches. Meets NFPA 110 for Emergency and Standby Power Systems. and the National Electrical Code (NEC) Articles 700, 701 and 702. 30 through 3000 amps in a compact design.