Honeywell AUTOMATIC CONTROL Engineering Manual page 496

GENERAL ENGINEERING DATA
Motors have two current ratings locked rotor (LRA) and full
load (FLA). Locked rotor current is drawn at the instant power
is applied and before the motor starts rotating. It is also drawn
if the motor is stalled. Full load current is drawn when the motor
is running at its full load rating.
Tables 24, 25, and 26 are provided as a convenience to the
reader for reference only. In all cases the National Electrical
code and local codes take precedence.
Types TF,
Cross -
section
of copper
Wire Approx-
Circular
Size imate
Mills
AWG Dia. in.
18 1620 0.106
16 2580 0.118
14 4110 0.131
12 6530 0.148
10 10,380 0.168
8 16,510 0.245
6 26,240 0.323
4 41,740 0.372
3 52,620 0.401
2 66,360 0.433
1 83,690 0.508
1/0 105,600 0.549
ENGINEERING MANUAL OF AUTOMATIC CONTROL
Table 25. Motor Current Ratings.
TW, THW Types RHW, RHH
Approx- Approx-
imate imate
Area in 2 Dia. in. 2
0.0088 0.146
0.0109 0.158
0.0135 0.204
0.0172 0.221
0.0222 0.242
0.0471 0.328
0.0819 0.397
0.1087 0.452
0.1263 0.481
0.1473 0.513
0.2027 0.588
0.2367 0.629
Table 24. Locked Rotor Indicating Code Letters.
Code Kilovolt-Amperes (KVA) per Horsepower
Letter
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
S
T
U
V
Types TFN,
THWN, THHN
Approx- Approx- Approx-
imate imate imate
Area n. 2 Area in 2
Dia. in.
0.0167 0.089 0.0062
0.0196 0.100 0.0079
0.0327 0.105 0.0087
0.0384 0.122 0.0117
0.0460 0.153 0.0184
0.0845 0.218 0.0373
0.1238 0.257 0.0519
0.1605 0.328 0.0845
0.1817 0.356 0.0995
0.2067 0.388 0.1182
0.2715 0.450 0.1590
0.3107 0.491 0.1893
486
with Locked Rotor
0 through 3.14
3.15 through 3.54
3.55 through 3.99
4.0 through 4.49
4.5 through 4.99
5.0 through 5.59
5.6 through 6.29
6.3 through 7.09
7.1 through 7.99
8.0 through 8.99
9.0 through 9.99
10.0 through 11.19
11.2 through 12.49
12.5 through 13.99
14.0 through 15.99
16.0 through 17.99
18.0 through 19.99
20.0 through 22.39
22.4 and up
Approximate dc Resistance
at 167F (75C)
Copper
Uncoated Coated
Ohm/Mft Ohm/Mft
7.95 8.45
4.89 5.29
3.14 3.26
1.98 2.05
1.24 1.29
0.778 0.809
0.491 0.510
0.308 0.321
0.245 0.254
0.194 0.201
0.154 0.160
0.122 0.127
Aluminum
Ohm/Mft
13.1
8.21
5.17
3.25
2.04
1.28
0.808
0.508
0.403
0.319
0.253
0.201