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Electric Motors - 480 Volt Wiring

480V electrical motor wiring data - NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp.

480 Volt motor wiring data - National Electric Manufacturers Association (NEMA) amps, starter size, motor circuit protection, phase wires, GND and conduit size:

Electric Motors - 480 Volt Wiring
Motor HPNEMA ampsStarter SizeOverloadMotor Circuit Protector type HMCP
(ampere)
Conduit Size
(inches)
Phase Wires
(AWG)
GND
(AWG)
1/2 1.0 1 W30 3 3/4 12 12
3/4 1.4 1 W33 3 3/4 12 12
1 1.8 1 W36 3 3/4 12 12
1 1/2 2.6 1 W40 7 3/4 12 12
2 3.4 1 W42 7 3/4 12 12
3 4.8 1 W45 7 3/4 12 12
5 7.5 1 W50 15 3/4 12 12
7 1/2 11 1 W54 15 3/4 12 12
10 14 1 W56 30 3/4 10 10
15 21 2 W61 50 3/4 10 10
20 27 2 W64 50 1 8 8
25 34 2 W67 70 1 1/4 6 6
30 40 3 W67 100 1 1/4 6 6
40 52 3 W69 100 1 1/4 4 4
50 65 3 W72 100 1 1/4 4 4
60 77 4 W74 150 1 1/2 2 2
75 96 4 W77 150 1 1/2 2 2
100 125 4 W36 200 2 2/0 2
125 156 5 W38 250 2 1/2 4/0 1/0
150 180 5 W40 400 2 1/2 4/0 1/0
  • 1 hp = 0.746 kW
  • the equipment grounding is sized for copper conductor according section 250.122 - National Electric Code (NEC)

The grounding conductor is sized to safely carry fault current for the short time until the breaker trips - it is also sized to keep the voltage drop due to fault currents in the ground below harmful levels.  The motor wiring is sized to continuously carry the full load and to keep the voltage drop at full load during start-up within a few %.

Related Topics

  • Electrical

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

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