Electrical Reference Resources

Hello, Log In / Register

Search:

Advance Part Search

(800) 264-2380

Coastal Electric Supply LLC

Products

Eaton Cooper Wiring Device

Hammond Power Solutions

Hubbell Hawke Cable Glands

Producto Electric Co.

Raychem

Remke Industries Inc.

Waterguard Technology

Electrical Reference Resources

Allowable ampacities of conductors

Allowable ampacities of insulated conductors Rated 0 - 200 volts, 60 °C through 90 °C (140 °F through 194 °F). Not more than three current-carring conductors in raceway, cable, or earth (directly burried), based on ambient air temperature of 30 °C (86 °F)
SIZE	60°C (140°F)	75°C (167°F)	90°C (194°F)	60°C (140°F)	75°C (167°F)	90°C (194°F)	SIZE
AWG or kcmil	TYPES TW, UP	TYPES RHW, THHW, THW, THWN, XHHW, USE, ZW	TYPES TBS, SA, SIS, FEP, FEPB, RHH,MI, RHW-2, THHN, THHW, THW-2, THWN-2, USE-2, XHH, XHHW, XHHW-2, ZW-2	TYPES TW, UF	TYPES RHW, THHW, THW, THWN, XHHW, USE	TYPES TBS, SA, SIS, THHN, THHW, THW-2, THWN-2, RHH, RHW-2, USE-2, XHH, XHHW, XHHW-2, ZW-2	AWG or kcmil
COOPER				ALUMINUM OR COPPER-CLAD ALUMINUM
14*	20	20	25	-	-	-	14
12*	25	25	30	20	20	25	12*
10*	30	35	40	25	30	35	10*
8	40	50	55	30	40	45	8
6	55	65	75	40	50	60	6
4	70	85	95	55	65	75	4
3	85	100	110	65	75	85	3
2	95	115	130	75	90	100	2
1	110	130	150	85	100	115	1
1/0	125	150	170	100	120	135	1/0
2/0	145	175	195	115	135	150	2/0
3/0	165	200	225	130	155	175	3/0
4/0	195	230	260	150	180	205	4/0
250	215	255	290	170	205	230	250
300	240	285	320	190	230	255	300
350	260	310	350	210	250	280	350
400	280	335	380	225	270	305	400
500	320	380	430	260	310	350	500
600	355	420	475	285	340	385	600
700	385	460	520	310	375	420	700
750	400	475	535	320	385	435	750
800	410	490	555	330	395	450	800
900	435	520	585	355	425	480	900
1000	455	545	615	375	445	500	1000
1250	495	590	665	405	485	545	1250
1500	520	625	705	435	520	585	1500
1750	545	650	735	455	545	615	1750
2000	560	665	750	470	560	630	2000
Ambient Temp °C	TEMPERATRUE CORRECTION FACTORS For ambient temperatures other than 30 °C, multiply the allowable ampacities shown above by the appropriate factor shown below.						Ambient Temp °F
21-25	1.08	1.05	1.04	1.08	1.05	1.04	70-77
26-30	1.00	1.00	1.00	1.00	1.00	1.00	78-86
31-35	0.91	0.94	0.96	0.91	0.94	0.96	87-95
36-40	0.82	0.88	0.91	0.82	0.88	0.91	96-104
41-45	0.71	0.82	0.87	0.71	0.82	0.87	105-113
46-50	0.58	0.75	0.82	0.58	0.75	0.82	114-122
51-55	0.41	0.67	0.76	0.41	0.67	0.76	123-131
56-60	-	0.58	0.71	-	0.58	0.71	132-140
61-70	-	0.33	0.58	-	0.33	0.58	141-158
71-80	-	-	0.41	-	-	0.41	159-176

* Unless specificaly permitted in 240.4 (E) or 240.4 (G), the overcurrent protection
shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes
for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum
and copper-clad aluminum after correction factors for ambient temperature and number
of conductors have been applied.
© Ugly's™ Electrical References revised 2008 Edition

Information

Line Card

Terms

Customer Service