| Motor Horsepower | Motor Amperes | 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.