Three Phase Electrical Motors
Full load amps, wire and conduit sizes for three phase electrical motors
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Typical full load current, minimum wire size and conduit size for 230V and 460V three phase electrical motors:
| Power | Full Load (amps) | Minimum Wire Size (AWG - Rubber) | Conduit Size (inches) | ||||
|---|---|---|---|---|---|---|---|
| (hp) | (kW) | 230V | 460V | 230V | 460V | 230V | 460V |
| 1 | 0.75 | 3.3 | 1.7 | 14 | 14 | 1/2 | 1/2 |
| 1.5 | 1.1 | 4.7 | 2.4 | 14 | 14 | 1/2 | 1/2 |
| 2 | 1.5 | 6 | 3 | 14 | 14 | 1/2 | 1/2 |
| 3 | 2.3 | 9 | 4.5 | 14 | 14 | 1/2 | 1/2 |
| 5 | 3.8 | 15 | 7.5 | 12 | 14 | 1/2 | 1/2 |
| 7.5 | 5.6 | 22 | 11 | 8 | 14 | 3/4 | 1/2 |
| 10 | 7.5 | 27 | 14 | 8 | 12 | 3/4 | 1/2 |
| 15 | 11 | 38 | 19 | 6 | 10 | 1-1/4 | 3/4 |
| 20 | 15 | 52 | 26 | 4 | 8 | 1-1/4 | 3/4 |
| 25 | 19 | 64 | 32 | 3 | 6 | 1-1/4 | 1-1/4 |
| 30 | 23 | 77 | 39 | 1 | 6 | 1-1/2 | 1-1/4 |
| 40 | 30 | 101 | 51 | 00 | 4 | 2 | 1-1/4 |
| 50 | 38 | 125 | 63 | 000 | 3 | 2 | 1-1/4 |
| 60 | 45 | 149 | 75 | 200M | 1 | 2-1/2 | 1-1/2 |
| 75 | 56 | 180 | 90 | 0000 | 0 | 2-1/2 | 2 |
| 100 | 75 | 245 | 123 | 500M | 000 | 3 | 2 |
| 125 | 94 | 310 | 155 | 750M | 0000 | 3-1/2 | 2-1/2 |
| 150 | 113 | 360 | 180 | 1000M | 300M | 4 | 2-1/2 |
- 1 hp (English horse power) = 745.7 W = 0.746 kW = 550 ft lb/s = 2,545 Btu/h = 33.000 ft lb/m = 1.0139 metric horse power ~= 1.0 KVA
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