| Motor Horsepower |
Motor Ampere |
Size Breaker |
Size Starter |
Heater Ampere |
Size Wire |
Size Conduit |
| 1 |
230V |
4.2 |
15 |
0 |
4.83 |
12 |
3/4" |
| 460V |
2.1 |
15 |
0 |
2.415 |
12 |
3/4" |
| 1 1/2 |
230V |
6 |
15 |
0 |
6.9 |
12 |
3/4" |
| 460V |
3 |
15 |
0 |
3.45 |
12 |
3/4" |
| 2 |
230V |
6.8 |
15 |
0 |
7.82 |
12 |
3/4" |
| 460V |
3.4 |
15 |
0 |
3.91 |
12 |
3/4" |
| 3 |
230V |
9.6 |
15 |
0 |
11.04 |
12 |
3/4" |
| 460V |
4.8 |
15 |
0 |
5.52 |
12 |
3/4" |
| 5 |
230V |
15.2 |
15 |
1 |
17.48 |
12 |
3/4" |
| 460V |
7.6 |
15 |
0 |
8.74 |
12 |
3/4" |
| 7 1/2 |
230V |
22 |
40 |
1 |
25.3 |
10 |
3/4" |
| 460V |
11 |
30 |
1 |
12.65 |
12 |
3/4" |
| 10 |
230V |
28 |
50 |
2 |
32.2 |
10 |
3/4" |
| 460V |
14 |
30 |
1 |
16.1 |
12 |
3/4" |
| 15 |
230V |
42 |
70 |
2 |
48.3 |
6 |
1" |
| 460V |
21 |
40 |
2 |
24.15 |
10 |
3/4" |
| 20 |
230V |
54 |
100 |
3 |
62.1 |
6 |
1" |
| 460V |
27 |
50 |
2 |
31.05 |
10 |
3/4" |
| 25 |
230V |
68 |
100 |
3 |
78.2 |
4 |
1-1/2" |
| 460V |
34 |
50 |
2 |
39.1 |
8 |
1" |
- Overcurrent device may have to be increased due to starting current and load conditions. See NEC 430-52, Table 430-152. Wire based on 75°C terminations and insulation.
- Overload heater must be based on motor nameplate and sized per NEC 430-32.
- 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.
