Over the past 35 years, motor regulations have expanded, requiring manufacturers to design and build more efficient electric motors and do their part in helping reduce energy consumption around the globe. In 1992, the true beginning of motor regulations, the Department of Energy (DOE) started putting strict minimum inefficiencies electric motors had to meet.
Some of us in the world use the metric system for measurements with millimeters, kilometers and kilograms; others use imperial measurements with inches, miles and pounds. Likewise motor standards in the North America are governed by the National Electrical Manufacturers Association (NEMA) and the standards book is MG 1-2014 which defines definitions, performance and dimensions for AC and DC motors.
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