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NEMA MG 2

2014 Edition, January 1, 2014

Complete Document

Safety Standard for Construction and Guide for Selection, Installation and Use of Electric Motors and Generators



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Description / Abstract:

This publication provides recommendations for the selection, installation, and use of rotating electric machines in such a manner as to provide for the practical safeguarding of persons and property. Excluded from the scope of this publication are the following:

a) Welding generators.

b) Booster, dynamic braking, and absorption type machines.

c) Isolated electric farm lighting plants.

d) Variable speed generator equipment for railway passenger cars.

e) Main propulsion motors, generators, and motor generator sets mounted on railroad and transit locomotives and cars.

f) Automotive motors, generators, and motor generator sets.

g) Motors, generators, exciters, and motor generator or exciter sets mounted on airborne craft.

h) Toy motors and small synchronous motors of the type generally used in household clocks and timing devices.

i) Additional specific features required in machines for use in hazardous (classified) locations. Such locations might be in mines or in areas defined in the National Electrical CodeĀ® (ANSI/NFPA 70), Articles 500 through 503.

j) Machines built to military specifications having requirements which conflict with or override the provisions of this publication.

k) Machine parts intended for installation in a hermetically sealed enclosure.

l) Non-salient-pole generators and their exciters.

m) Generators larger than 10,000 kVA, and their exciters, for hydraulic turbine drive, including reversible motor generator units.

n) Synchronous condensers, frequency changers, and phase converters.

Since any machine can be installed or operated in such a manner that hazards can occur, compliance with this publication does not by itself assure a safe installation. However, when a machine complying with this publication is properly selected with respect to the driven load and environment, and is installed in accordance with the applicable provisions of national codes and sound local practices, the hazards to persons and property will be reduced.

ANSI/NEMA MW 1000, 2014