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NEMA Code Letters for AC
Motors
NEMA Code Letters for
Locked-Rotor KVA
The letter designations for locked-rotor kVA per
horsepower as measured at full voltage and rated frequency are as
follows.
Letter
Designation |
KVA
per
Horsepower* |
A
B
C |
0.0 -
3.15
3.15 - 3.55
3.55 - 4.0 |
D
E
F
G |
4.0 - 4.5
4.5 - 5.0
5.0 - 5.6
5.6 - 6.3 |
H
J |
6.3 - 7.1
7.1 - 8.0 |
K
L
M |
8.0 - 9.0
9.0 - 10.0
10.0 - 11.2 |
N
P
R
S |
11.2 -
12.5
12.5 - 14.0
14.0 - 16.0
16.0 - 18.0 |
T
U
V |
18.0 -
20.0
20.0 - 22.4
22.4 - & up |
*Locked kVA per horsepower range
includes the lower figure up to, but not including, the higher figure.
For example, 3.14 is designated by letter A and 3.15 by letter B.
Reference: NEMA Standards MG 1 - 10.37.2.
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Code Letters Usually
Applied to Ratings of Motors Normally Started on Full Voltage
|
Code Letters
|
F |
G |
H |
J |
K |
L |
|
Horse-
power
|
3-phase |
15 up |
10 - 7½ |
5 |
3 |
2 - 1½ |
1 |
| 1-phase |
- - - |
5 |
3 |
2 - 1½ |
1 - ¾ |
½ |
Starting KVA per
Horsepower for Single-Phase Motors
|
Starting KVA per hp =
|
Volts
x Locked-Rotor Amps
1000 x hp |
|
1 for 1 Ø
1.732 for 3 Ø
|
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