236 Electrical Power Systems Technology
Table 8-5. Ampacities of Conductors in a Raceway of Cable (3 or less)
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Copper Aluminum
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With RH, With RH,
With R, T, RHW With R, T, RHW, TH
TW TH, THW TW THW
Wire Size Insulation Insulation Insulation Insulation
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AWG 14 15 15
12 20 20 15 15
10 30 30 25 25
8 40 45 30 40
6 55 65 40 50
4 70 85 55 65
3 80 100 65 75
2 95 115 75 90
1 110 130 85 100
0 125 150 100 120
00 145 175 115 135
000 165 200 130 155
0000 195 230 155 180
MCM 250 215 255 170 205
300 240 285 190 230
350 260 310 210 250
400 280 335 225 270
500 320 380 260 310
600 355 420 285 340
700 385 460 310 375
750 400 475 320 385
800 410 490 330 395
900 435 520 355 425
1000 455 545 375 445
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Table 8-6. Correction Factors for Temperatures about 300°C
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Ambient Temperature Conductor Correction Factor
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R, T,
C° F° TW RH, RHW, TH, THW
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40 104 0.82 0.88
45 113 0.71 0.82
50 122 0.58 0.75
55 131 0.41 0.67
60 140 — 0.58
70 158 — 0.35
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