Circuit Wiring - Three Phase (230 & 460V) Electrical Motors

Recommended copper wire gage and transformer size for Three Phase - 230 & 460V - electrical motors

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All wiring and electrical connections should comply with the National Electrical Code (NEC) and with local codes and practices.

Wire Gage (AWG)
Transformer			Distance - Motor to Transformer (Feet)
HP	Volts	kVA	100	150	200	300	500
1.5	230	3	12	12	12	12	10
2	460	3	12	12	12	12	12
3	230	3	12	12	12	10	8
2	460	3	12	12	12	12	12
3	230	5	12	10	10	8	6
3	460	5	12	12	12	12	10
5	230	7.5	10	8	8	6	4
5	460	7.5	12	12	12	10	8
7.5	230	10	8	6	6	4	2
7.5	460	10	12	12	12	10	8
10	230	15	6	4	4	4	1
10	460	15	12	12	12	10	8
15	230	20	4	4	4	2	0
15	460	20	12	10	10	8	6
20	230	¹⁾	4	2	2	1	0
20	460	¹⁾	10	8	8	6	4
25	230	¹⁾	2	2	2	0	0
30	230	¹⁾	2	1	1	0	0
30	460	¹⁾	8	6	6	4	2
40	230	¹⁾	1	0	0	0	0
50	230	¹⁾	1	0	0	0	0
50	460	¹⁾	4	4	2	2	0
30	230	¹⁾	1	0	0	0	0
60	460	¹⁾	4	2	2	0	0
75	230	¹⁾	0	0	0	0	0
75	460	¹⁾	4	2	2	0	0

¹⁾ The local power company should be consulted

If undersized wire is used between the motor and the power source, the starting and load carrying cap abilities of the motor will be limited.

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