Circuit Wiring - Three Phase (230 & 460V) Electrical Motors

Recommended copper wire gage and transformer size for Three Phase - 230 & 460V - electrical motors

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

Wire Gage (AWG)
Transformer Distance - Motor to Transformer (Feet)
HP Volts kVA 100 150 200 300 500
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 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.

Related Topics

  • Electrical - Amps and electrical wiring, AWG - wire gauge, electrical formulas, motors and units

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