Historical
NEMA ICS 10 P1:2005
Industrial control and systems part 1: electromechanical ac transfer switch equipment (Includes 2006 errata)
Applies to electromechanical automatic and non-automatic transfer switches and bypass isolation switches rated 600 V ac or less, 60 Hz, for use on single-phase and polyphase ac circuits.
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NEMA: National Electrical Manufacturers Association [nema]