Electric Motors - 480 Volt Wiring

480V electrical motor wiring data - NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp. Reference data for motor circuit protection, phase wires, ground, and conduit sizing.

Motor HP	NEMA amps	Starter Size	Overload	HMCP (ampere)	Conduit Size (inches)	Phase Wires (AWG)	GND (AWG)
1/2	1	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