June 28, 2017

ALLOWABLE AMPACITIES INSULATED CONDUCTORS
(IN A RACEWAY) TABLE 310-16 2005 NEC

TEMPERATURE RATING OF CONDUCTOR
60°C 75°C 90°C 60°C 75°C 90°C
AWG THW THW
THWN THWN
MCM USE THHN UF USE THHN
COPPER ALUMINUM OR COPPER-CLAD ALUMINUM
18 14*
16 18*
14 20* 20* 25*
12 25* 25* 30* 20* 20* 25*
10 30* 35* 40* 25* 30* 35*
8 40 50 55 30 40 45
6 55 65 75 40 50 60
4 70 85 95 55 65 75
3 85 100 110 65 75 85
2 95 115 130 75 90 100
1 110 130 150 75 90 100
1/0 125 150 170 100 120 135
2/0 145 175 195 115 135 150
3/0 165 200 225 130 155 175
4/0 195 230 260 150 180 205
250 215 255 290 170 205 230
300 240 285 320 190 230 255
350 260 310 350 210 250 280
400 280 335 380 225 270 305
500 320 380 430 260 310 360
600 355 420 475 285 340 385
700 385 460 520 310 375 420
750 400 475 535 320 385 435