Ampacities of Insulated Conductors
[NEC Table 310.15(B)(16)]

Based on Ambient Temperature of 30°C (86°F). Rated Up to 2000V. Not more than 3 Conductors in Raceway, Cable or Earth (Directly Buried)

SizeCopper ConductorsAluminum or Copper-Clad Conductors
60°C
140°F
75°C
167°F
90°C
194°F
60°C
140°F
75°C
167°F
90°C
194°F
Wire SizeTypesTypesTypesTypesTypesTypes
TW, UFRHW, THHW, THW, THWN, XHHW, USE, ZWTBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, USE-2, XHH, XHHW, XHHW-2, ZW-2TW, UFRHW, THHW, THW, THWN, XHHW, USE, ZWTBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, USE-2, XHH, XHHW, XHHW-2, ZW-2
AWG or kcmilmm2
180.8--14---
161.3--18---
1412.1152025---
1213.3202530151201251
1015.330354025301351
88.4405055354045
613.3556575405055
421.2708595556575
326.785100115657585
233.6951151307590100
142.411013014585100115
1/053.5125150170100120135
2/067.4145175195115135150
3/085.0165200225130155175
4/0107195230260150180205
250127215255290170205230
300152240285320195230260
350177260310350210250280
400203280335380225270305
500253320380430260310350
600304350420475285340385
700355385460520315375425
750380400475535320385435
800405410490555330395445
900456435520585355425480
1000507455545615375445500
1250633495590665405485545
1500760525625705435520585
1750887545650735455545615
20001013555665750470560630

1 The load current rating and the overcurrent protection for conductor types shall not exceed 15A for 14 AWG, 20A for 12 AWG, and 30A for 10 AWG aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied.


Correction Factors for Ambient Temperature over 30°C (86° F) [NEC Table 310.15(B)(2)(a)]
Ambient TemperatureFor Ambient Temperatures over 30°C (86°F), multiply the ampacities shown above by the factor show below:
°C°F60°C
140°F
75°C
167°F
90°C
194°F
≤ 10≤ 501.291.201.15
11-1551-591.221.151.12
16-2060-681.151.111.08
21-2569-771.081.051.04
26-3078-861.001.001.00
31-3587-95.91.94.96
36-4096-104.82.88.91
41-45105-113.71.82.87
46-50114-122.58.75.82
51-55123-131.41.67.76
56-60132-140-.58.71
61-65141-149-.47.65
66-70150-158-.33.58
71-75159-167--.50
76-80168-176--.41
81-85177-185--.29

120/240V 3-Wire residential services
[NEC Table 310.15 (B)(7)]
Copper AWGAluminum AWGRating (amps)
42100
31110
21/0125
12/0150
1/03/0175
2/04/0200
3/0250 kcmil225
4/0300 kcmil250
250 kcmil350 kcmil300
350 kcmil500 kcmil350
400 kcmil600 kcmil400