Table 310.15(B)(16)

Size	Copper			Aluminum
Size	60°C	75°C	90°C	60°C	75°C	90°C
14 AWG	15	20	25	—	—	—
12 AWG	20	25	30	15	20	25
10 AWG	30	35	40	25	30	35
8 AWG	40	50	55	30	40	45
6 AWG	55	65	75	40	50	55
4 AWG	70	85	95	55	65	75
3 AWG	85	100	110	65	75	85
2 AWG	95	115	130	75	90	100
1 AWG	110	130	150	85	100	115
1/0 AWG	125	150	170	100	120	135
2/0 AWG	145	175	195	115	135	150
3/0 AWG	165	200	225	130	155	175
4/0 AWG	195	230	260	150	180	205
250 kcmil	215	255	290	170	205	230
300 kcmil	240	285	320	190	230	255
350 kcmil	260	310	350	210	250	280
400 kcmil	280	335	380	225	270	305
500 kcmil	320	380	430	260	310	350
600 kcmil	355	420	475	285	340	385
700 kcmil	385	460	520	310	375	420
750 kcmil	400	475	535	320	385	435

Allowable ampacities of insulated conductors rated up to 2,000V in raceway, cable, or earth — not more than three current-carrying conductors, ambient temperature 30°C (86°F). THWN / THHN / XHHW.

Source: NEC 2023 Table 310.15(B)(16). Values in amperes.