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Electric Motor Wiring - 480 Volt

Electrical motor wiring data - NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp

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

Motor HPNEMA ampsStarter SizeOverloadMotor Circuit Protector Size
HMCP
Conduit Size
(inches)
Phase Wires
(AWG)
GND
(AWG)
1/2 1.0 1 W30 3 3/4 12 14
3/4 1.4 1 W33 3 3/4 12 14
1 1.8 1 W36 3 3/4 12 14
1 1/2 2.6 1 W40 7 3/4 12 14
2 3.4 1 W42 7 3/4 12 14
3 4.8 1 W45 7 3/4 12 14
5 7.5 1 W50 15 3/4 12 14
7 1/2 11 1 W54 15 3/4 12 14
10 14 1 W56 30 3/4 12 14
15 21 2 W61 50 3/4 10 10
20 27 2 W64 50 1 8 10
25 34 2 W67 70 1 1/4 8 10
30 40 3 W67 100 1 1/4 6 10
40 52 3 W69 100 1 1/4 4 10
50 65 3 W72 100 1 1/4 3 8
60 77 4 W74 150 1 1/2 1 8
75 96 4 W77 150 1 1/2 1/0 8
100 125 4 W36 200 2 2/0 6
125 156 5 W38 250 2 1/2 4/0 6
150 180 5 W40 400 2 1/2 4/0 6
200 240 5 W43 400 3 350 MCM 4
250 300 6 W38 400 4 500 MCM 3
300 360 6 W40 500 4 700 MCM 3
350 420 6 W41 600 4 900 MCM 2
400 480 6 W43 600 4 1250 MCM 2
  • 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 %.

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  • en: 480 VOLT MOTOR WIRING DATA
  • es: 480 VOLTIOS DE DATOS DE CABLEADO DE MOTOR
  • de: 480 Volt-Motor Verdrahtungsdaten
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