Allowable ampacity of single, insulated aluminum or copper-clad aluminum conductors

Tables > Conductors > Ampacity > Aluminum or Copper-clad, single

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Ampacities Of Single Insulated Conductors Rated 0-2,000 Volts In Free Air
Based On Ambient Temperature Of 30 degrees Celsius (86 degrees Fahrenheit)			Based On Ambient Temperature Of 40 degrees Celsius (104 degrees Fahrenheit)
Size	60 degrees Celsius (140 degrees Fahrenheit)	75 degrees Celsius (167 degrees Fahrenheit)	90 degrees Celsius (194 degrees Fahrenheit)	150 degrees Celsius (302 degrees Fahrenheit)
AWG kcmil	Types TW, UF	Types THWN, THHW XHHW, RHW, THW, RH	Types TBS, XHH, RHH,RHW-2, XHHW, USE-2, THHN, SA, THHW, THW-2, XHHW-2, ZW-2, THWN-2, SIS	Types Z
14	-	-	-	-
12	25*	30*	35*	47
10	35*	40*	40*	63
8	45	55	60	83
6	60	75	80	112
4	80	100	110	148
3	95	115	130	170
2	110	135	150	198
1	130	155	175	228
1/0	150	180	205	263
2/0	175	210	235	305
3/0	200	240	275	351
4/0	235	280	315	411
250	265	315	355	-
300	290	350	395	-
350	330	395	445	-
400	355	425	480	-
500	405	485	545	-
600	455	540	615	-
700	500	595	675	-
750	515	620	700	-
800	535	645	725	-
900	580	700	785	-
1000	625	750	845	-
1250	710	855	960	-
1500	795	950	1075	-
1750	875	1050	1185	-
2000	960	1150	1335	-

Overcurrent protection for conductor types marked (*) shall not exceed 15 amperes for Size 12 AWG, and 25 amperes for Size 10 AWG. See NEC 240-3 for motor & welders overcurrent protection exceptions.
For ambient temperatures other than those noted above, see NEC tables 310-17 & 310-19.
Reprinted with permission from NFPA 70-1999, the National Electrical Code®, Copyright 1998, National Fire Protection Association, Quincy, MA 02269. This reprinted material is not the referenced subject which is represented only by the Standard in its entirety.