Wire Ampacity Chart

Base allowable ampacities for copper and aluminum conductors at 60°C, 75°C and 90°C. These are the starting values — apply the ambient and raceway corrections with the ampacity calculator, or find the right size directly with the wire size calculator.

Copper

Size	60°C	75°C	90°C
14	15 A	20 A	25 A
12	20 A	25 A	30 A
10	30 A	35 A	40 A
8	40 A	50 A	55 A
6	55 A	65 A	75 A
4	70 A	85 A	95 A
3	85 A	100 A	115 A
2	95 A	115 A	130 A
1	110 A	130 A	145 A
1/0	125 A	150 A	170 A
2/0	145 A	175 A	195 A
3/0	165 A	200 A	225 A
4/0	195 A	230 A	260 A
250	215 A	255 A	290 A
300	240 A	285 A	320 A
350	260 A	310 A	350 A
400	280 A	335 A	380 A
500	320 A	380 A	430 A
600	350 A	420 A	475 A
750	400 A	475 A	535 A
1000	455 A	545 A	615 A

Aluminum

Size	60°C	75°C	90°C
12	15 A	20 A	25 A
10	25 A	30 A	35 A
8	30 A	40 A	45 A
6	40 A	50 A	55 A
4	55 A	65 A	75 A
3	65 A	75 A	85 A
2	75 A	90 A	100 A
1	85 A	100 A	115 A
1/0	100 A	120 A	135 A
2/0	115 A	135 A	150 A
3/0	130 A	155 A	175 A
4/0	150 A	180 A	205 A
250	170 A	205 A	230 A
300	195 A	230 A	260 A
350	210 A	250 A	280 A
400	225 A	270 A	305 A
500	260 A	310 A	350 A
600	285 A	340 A	385 A
750	320 A	385 A	435 A
1000	375 A	445 A	500 A

Values pending review against the current NEC edition. Verify before relying on them for construction.