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.