Suggested Ampacities

All types of insulations
	Copper							Aluminum
	Not more than		Single conductor in free air					Not more than		Single conductor in free air
	3 conductors in							3 conductors in
	raceway or cable							raceway or cable
	Conductor Temperature Rating							Conductor Temperature Rating
Size AWG or MCM	85-90C	110C	85-90C	110C	125C	200C		85-90C	110C	85-90C	110C	125C	200C
Size AWG or MCM	(185F)	(230F)	(185F)	(230F)	(257F)	(392F)		(185F)	(230F)	(185F)	(230F)	(257F)	(392F)
	Amperes per Conductor							Amperes per Conductor
	100% Load Factor							100% Load Factor
14	25	30	30	40	40	45		–	–	–	–	–	–
12	30	35	40	50	50	55		25	25	30	40	40	45
10	40	45	55	65	70	75		30	35	45	50	55	60
8	55	60	75	85	90	100		40	45	55	65	70	80
6	70	80	100	120	125	135		55	60	80	95	100	105
4	95	105	135	160	170	180		75	80	105	125	135	140
2	125	135	185	210	225	240		100	105	140	165	175	185
1	145	160	215	245	265	280		110	125	165	190	205	220
1/0	165	190	250	285	305	325		130	150	190	220	240	255
2/0	190	215	290	330	355	370		145	170	220	255	275	290
3/0	215	245	335	385	410	430		170	195	255	300	320	335
4/0	250	275	390	445	475	510		195	215	300	345	370	400
250	275	315	440	495	530	–		220	250	330	385	415	–
300	310	345	485	555	590	–		250	275	375	435	460	–
350	340	390	550	610	655	–		270	310	415	475	510	–
400	365	420	595	665	710	–		295	335	450	520	555	–
500	415	470	675	765	815	–		335	380	515	595	635	–
600	460	525	750	855	910	–		370	425	585	675	720	–
700	500	560	825	940	1005	–		405	455	645	745	795	–
750	515	580	855	980	1045	–		420	470	670	775	825	–
800	535	600	885	1020	1085	–		430	485	695	805	855	–
900	565	–	950	–	–	–		465	–	750	–	–	–
1000	590	680	1020	1165	1240	–		485	560	800	930	990	–
Correction factors for various ambient air temperatures
40 C	0.90	0.94	0.90	0.94	0.95	–	0.90	0.94	0.90	0.94	0.95	–
50	0.80	0.87	0.80	0.87	0.89	–	0.80	0.87	0.80	0.87	0.89	–
60	0.67	0.79	0.67	0.79	0.83	0.91	0.67	0.79	0.67	0.79	0.83	0.91
70	0.52	0.71	0.52	0.71	0.76	0.87	0.52	0.71	0.52	0.71	0.76	0.87
80	0.30	0.61	0.30	0.61	0.69	0.84	0.30	0.61	0.30	0.61	0.69	0.84
90	–	0.50	–	0.50	0.61	0.80	–	0.50	–	0.50	0.61	0.80
100	–	–	–	–	0.51	0.77	–	–	–	–	0.51	0.77
120	–	–	–	–	–	0.69	–	–	–	–	–	0.69
140	–	–	–	–	–	–	0.59	–	–	–	–	0.59
Based on ambient temperature of 30C (86 F) and National Electrical Code