Electrical Motors Efficiency Ratings
NEMA - electrical motor efficiency ratings.
The efficiency of an electrical motor is the ratio mechanical power output to the electric power input.
NEMA has established the efficiency index:
NEMA Letter Index | Nominal Efficiency | Minimum Efficiency |
---|---|---|
A | 95.0 | |
B | 95.0 | 94.1 |
C | 94.1 | 93.0 |
D | 93.0 | 91.7 |
E | 91.7 | 90.2 |
F | 90.2 | 88.5 |
G | 88.5 | 86.5 |
H | 86.5 | 84.0 |
K | 84.0 | 81.5 |
L | 81.5 | 78.5 |
M | 78.5 | 75.5 |
N | 75.5 | 72.0 |
P | 72.0 | 68.0 |
R | 68.0 | 64.0 |
S | 64.0 | 59.5 |
T | 59.5 | 55.0 |
U | 55.0 | 50.5 |
V | 50.5 | 46.0 |
W | 46.0 |
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