FULL LOAD CURRENT AND OTHER DATA FOR THREE PHASE A.C. MOTORS
|
Motor Horsepower
|
Motor Ampere
|
Size Breaker
|
Size Starter
|
Heater Ampere
|
Size Wire
|
Size Conduit
|
|
1
|
230V
460 V
|
4.2
2.1
|
15
15
|
00
00
|
4.830
2.415
|
12
12
|
3/4"
3/4"
|
|
1-1/2
|
230V
460V
|
6.0
3.0
|
15
15
|
00
00
|
6.900
3.450
|
12
12
|
3/4"
3/4"
|
|
2
|
230V
460V
|
6.8
3.4
|
15
15
|
0
00
|
7.820
3.910
|
12
12
|
3/4"
3/4"
|
|
3
|
230V
460V
|
9.6
4.8
|
20
15
|
0
0
|
11.040
5.520
|
12
12
|
3/4"
3/4"
|
|
5
|
230V
460V
|
15.2
7.6
|
30
15
|
1
0
|
17.480
8.740
|
12
12
|
3/4"
3/4"
|
|
7-1/2
|
230V
460V
|
22
11
|
45
20
|
1
1
|
25.300
12.650
|
10
12
|
3/4"
3/4"
|
|
10
|
230V
460V
|
28
14
|
60
30
|
2
1
|
32.200
16.100
|
10
12
|
3/4"
3/4"
|
|
15
|
230V
460V
|
42
21
|
70
40
|
2
2
|
48.300
24.150
|
6
10
|
1"
3/4"
|
|
20
|
230V
460V
|
54
27
|
100
50
|
3
2
|
62.100
31.050
|
4
10
|
1"
3/4"
|
|
25
|
230V
460V
|
68
34
|
100
50
|
3
2
|
78.200
39.100
|
4
8
|
1-1/2"
1"
|
1) Overcurrent device may have to be increased due to starting current and load conditions. See 2008 NEC 430.250, Table 430-250. Wire based on 75°C terminations
and insulation.
2) Overload heater must be based on motor nameplate and sized per NEC 430-32.
3) Conduit size based on Rigid metal conduit with some spare capacity. For minimum size and other conduit types, see NEC Appendix C, or UGLY'S pages 102-122.