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Three-Phase Electrical Motors - Power vs. Amps and Voltage

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Typical full load current, minimum wire size and conduit size for 230V and 460V three phase electrical motors:

PowerFull Load
(amps)		Minimum Wire Size
(AWG - Rubber)		Conduit Size
(inches)
(hp)(kW)230V460V230V460V230V460V
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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• Electrical

Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.

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