NEC 2011: Table 310.15(B)(17)

 

Allowable Ampacities of Single-Insulated Conductors in Free Air, based on Ambient Air Temperature of 30C.
Size Temperature Rating of Conductor Size
AWG or kcmil 60ºC 75ºC 90ºC 60ºC 75ºC 90ºC AWG or kcmil
(140ºF)  (167ºF)  (194ºF)  (140ºF)  (167ºF) (194ºF)
Types Types Types Types Types Types
TW
UF
RHW
THHW
THW
XHHW
RHH
THHN
XHH
XHHW
TW
UF
RHW
THHW
THW
XHHW
RHH
THHN
XHH
XHHW
Copper Aluminum
18 ---- ---- 18 ---- ---- ---- ----
16 ---- ---- 24 ---- ---- ---- ----
14 25 30 35 ---- ---- ---- ----
12 30 35 40 25 30 35 12
10 40 50 55 35 40 45 10
8 60 70 80 45 55 60 8
6 80 95 105 60 75 85 6
4 105 125 140 80 100 115 4
3 120 145 165 95 115 130 3
2 140 170 190 110 135 150 2
1 165 195 220 130 155 175 1
1/0 195 230 260 150 180 205 1/0
2/0 225 265 300 175 210 235 2/0
3/0 260 310 350 200 240 270 3/0
4/0 300 360 405 235 280 315 4/0
250 340 405 455 265 315 355 250
300 375 445 500 290 350 395 300
350 420 505 570 330 395 445 350
400 455 545 615 355 425 480 400
500 515 620 700 405 485 545 500
600 575 690 780 455 540 615 600
700 630 755 850 500 595 670 700
750 655 785 885 515 620 700 750
800 680 815 920 535 645 725 800
900 730 870 980 580 700 790 900
1000 780 935 1055 625 750 845 1000
1250 890 1065 1200 710 855 965 1250
1500 980 1175 1325 795 950 1070 1500
1750 1070 1280 1445 875 1050 1185 1750
2000 1155 1385 1560 960 1150 1295 2000

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