Circuit Wiring - Single Phase (230V) Electrical Motors

Recommended copper wire gage and transformer size for single phase - 230 Volts - 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 from Motor to Transformer (feet)
hp kVA 100 150 200 300 500
1.5 3 10 8 8 6 4
2 3 10 8 8 8 4
3 5 8 8 8 4 2
5 7.5 6 4 4 2 0
7.5 10 6 4 3 1 0
  • 1 ft (foot) = 0.3048 m

If undersized wire is used between the motor and the power source, the starting and load carrying capabilities 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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