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NEMA IA 10042-1-2025
Industrial Control and Systems - Part 1: Transfer Switch Equipment
Applies to electromechanical automatic and nonautomatic transfer switches and bypass isolation switches rated 1000 volts AC or less, 60 Hertz, for use on single phase and polyphase AC circuits; and 1000 volts DC or less.
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NEMA: National Electrical Manufacturers Association [nema]