Three Phase Electrical Motors

Full load amps, wire and conduit sizes for three phase electrical motors

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Typical full load current, minimum wire size and conduit size for 230V and 460V three phase electrical motors:

Power		Full Load (amps)		Minimum Wire Size (AWG - Rubber)		Conduit Size (inches)
(hp)	(kW)	230V	460V	230V	460V	230V	460V
1	0.75	3.3	1.7	14	14	1/2	1/2
1.5	1.1	4.7	2.4	14	14	1/2	1/2
2	1.5	6	3	14	14	1/2	1/2
3	2.3	9	4.5	14	14	1/2	1/2
5	3.8	15	7.5	12	14	1/2	1/2
7.5	5.6	22	11	8	14	3/4	1/2
10	7.5	27	14	8	12	3/4	1/2
15	11	38	19	6	10	1-1/4	3/4
20	15	52	26	4	8	1-1/4	3/4
25	19	64	32	3	6	1-1/4	1-1/4
30	23	77	39	1	6	1-1/2	1-1/4
40	30	101	51	00	4	2	1-1/4
50	38	125	63	000	3	2	1-1/4
60	45	149	75	200M	1	2-1/2	1-1/2
75	56	180	90	0000	0	2-1/2	2
100	75	245	123	500M	000	3	2
125	94	310	155	750M	0000	3-1/2	2-1/2
150	113	360	180	1000M	300M	4	2-1/2

1 hp (English horse power) = 745.7 W = 0.746 kW = 550 ft lb/s = 2,545 Btu/h = 33.000 ft lb/m = 1.0139 metric horse power ~= 1.0 KVA

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