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Electric Motor Wiring - Three Phase 230 & 460V Circuits

Recommended dimensions of copper wire and transformers for tree phase 230 & 460V electrical motors

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All wiring and electrical connections should comply with the National Electrical Code (NEC) and with local codes and practices.

Wire Gauge (AWG)
TransformerDistance - Motor to Transformer (Feet)
Load Calculator!
(HP)(volts)Apparent Power
(kVA)
100150200300500
1.5 230 3 12 12 12 12 10
2 460 3 12 12 12 12 12
3 230 3 12 12 12 10 8
2 460 3 12 12 12 12 12
3 230 5 12 10 10 8 6
3 460 5 12 12 12 12 10
5 230 7.5 10 8 8 6 4
5 460 7.5 12 12 12 10 8
7.5 230 10 8 6 6 4 2
7.5 460 10 12 12 12 10 8
10 230 15 6 4 4 4 1
10 460 15 12 12 12 10 8
15 230 20 4 4 4 2 0
15 460 20 12 10 10 8 6
20 230 1) 4 2 2 1 0
20 460 1) 10 8 8 6 4
25 230 1) 2 2 2 0 0
30 230 1) 2 1 1 0 0
30 460 1) 8 6 6 4 2
40 230 1) 1 0 0 0 0
50 230 1) 1 0 0 0 0
50 460 1) 4 4 2 2 0
30 230 1) 1 0 0 0 0
60 460 1) 4 2 2 0 0
75 230 1) 0 0 0 0 0
75 460 1) 4 2 2 0 0

1) The local power company should be consulted

  • 1 hp = 0.746 kW
  • 1 ft (foot) = 0.3048 m

If undersized wire is used between the motor and the power source, the starting and load carrying cap abilities of the motor will be limited.

Apparent Power is the power supplied to the electric circuit - typical from a power supplier to the grid - to cover the real and reactive power consumption in the loads

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