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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:

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

Related Topics

  • Electrical

    Electrical engineering with units, amps and electrical wiring. Wire gauges, electrical formulas, motors and more.

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