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ANSI/NEMA KS 3-2023
Guidelines for Inspection and Preventive Maintenance of Switches Used in Commercial and Industrial Applications
NEMA Standards Publication KS 3 sets forth, for use by qualified personnel , a number of basic procedures that may be used for the inspection and preventive maintenance of switches used in industrial and commercial applications rated up to and including 600 V 50/60 Hz AC or AC/DC.
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NEMA: National Electrical Manufacturers Association [nema]