Understanding the NEMA motor-generator standards of section MG-1-1993, revision 3, three-phase induction motors

The National Electrical Manufacturers Association (NEMA) motor-generator standards (MG-1) have gone through numerous revisions and additions. Key information pertaining to motor performance, construction and operating conditions are provided for end users' consideration when specifying electric motors. There still is some confusion regarding how to specify electric motors and how to interpret nameplate data on existing motors. This paper provides the user with a condensed version of MG-1 to serve as a quick reference guide.