Allowable Ampacities Insulated Conductors

Table 310-16 1996 N.E.C.

	60Â°C	75Â°C	90Â°C	60Â°C	75Â°C	90Â°C
AWG		THW			THW
	TW	THWN		TW	THWN
MCM	UF	USE	THHN	UF	USE	THHN
	COPPER			ALUMINUM
18			14*
16			18*
14	20*	20*	25*
12	25*	25*	30*	20*	20*	25*
10	30*	35*	40*	25*	30*	35*
8	40	50	55	30	40	45
6	55	65	75	40	50	60
4	70	85	95	55	65	75
3	85	100	110	65	75	85
2	95	115	130	75	90	100
1	110	130	150	85	100	115
1/0	125	150	170	100	120	135
2/0	145	175	195	115	135	150
3/0	165	200	225	130	155	175
4/0	195	230	260	150	180	205
250	215	255	290	170	205	230
300	240	285	320	190	230	255
350	260	310	350	210	250	280
400	280	335	380	225	270	305
500	320	380	430	260	310	350
600	355	420	475	285	340	385
700	385	460	520	310	375	420
750	400	475	535	320	385	435

* Unless otherwise specifically permitted elsewhere in the National
Electrical Code Book, the overcurrent protection for conductor types marked
with an asterisk shall not exceed 15 amperes for No. 14, 20 amperes for No.
12 & 30 amperes for No. 10 copper; or 15 amperes for No. 12 & 25 amperes
for No. 10 aluminum & copper-clad aluminum after any correction factors for
ambient temperature & number of conductors has been applied.