Specifications

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NEMA Frame Size A designation that identifies motor dimensions based upon
standards provided by the National Electrical Manufacturers
Association. Motors too large to correspond to NEMA frame
sizes are referred to as above NEMA motors.
NEMA Motor Design A letter designation based upon standards established by the
National Electrical Manufacturers Association that corresponds
to a motor’s speed and torque characteristics.
300
275
250
225
200
175
150
125
100
75
50
25
0
0 10 20 30 40 50 60 70 80 90 100
NEMA D
NEMA C
NEMA B
% Full-Load Torque
% Synchronous Speed
Full-Load Torque
Neutral A reference connection in a power distribution system.
480 Volts
480 Volts
480 Volts
277 Volts
277 Volts
A
C
Neutral
277 Volts
3-Phase, 4-Wire (Wye-Connected) Transformer Secondary
480 Volts Phase-to-Phase, 277 Volts Phase-to-Neutral
B
N
Ohm The basic unit of resistance, reactance and impedance. The
symbol for the ohm is “W”, the Greek letter omega.
Ohmmeter A meter designed to measure resistance.