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NEMA PREMIUM:2014
General Specification for Consultants, Industrial and Municipal: NEMA Premium® Efficiency Electric Motors
Outlines the minimum requirements for three-phase ac induction motors applied to municipal and industrial applications for operation on voltages 600 V or less, rated 500 hp or less, operating more than 2,000 hours per year at greater than 75 percent of full load.
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NEMA: National Electrical Manufacturers Association [nema]