Motor Wiring Data - 480 Volt

Motor wiring data - NEMA Amps, Starter size, HMCP Size .. - motors ranging 1/2 - 500 HP

480 Volt motor wiring data - NEMA Amps, starter size, HMCP size overload phase wires, GND and conduit size are indicated below:

Motor HP NEMA Amps Starter Size Overload Motor Circuit Protector Size
HMCP
Conduit Size Phase Wires GND
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 10 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 6 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 4 8
60 77 4 W74 150 1 1/2 2 8
75 96 4 W77 150 1 1/2 2 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 4
250 300 6 W38 400 4 2 - 250 3
300 360 6 W40 500 4 2 - 250 3
350 420 6 W41 600 4 2 - 300 2
400 480 6 W43 600 4 2 - 350 2
500 600 7   750 5 3 - 350 1
  • 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 - Amps and electrical wiring, AWG - wire gauge, electrical formulas, motors and units

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