Three-Phase Electrical Motors - Power vs. Amps and Voltage
Full load amps, wire and conduit sizes for three phase electrical motors.
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
