Single-phase and Three-phase Distribution Systems 271
Table 10-2. Sizes of Copper and Aluminum Conductors
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DC Resistance
(Ω/1000 ft) 25 C
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Size A-D^2 Number Diameter
(AWG or Area of of Each
MCM) (cmil) Wires Wire (in.) Copper Aluminum
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AWE 18 1,620 1 0.0403 6.51 10.7
16 2,580 1 0.0508 4.10 6.72
14 4,110 1 0.0641 2.57 4.22
12 6,530 1 0.0808 1.62 2.66
10 10,380 1 0.1019 1.018 1.67
8 16,510 1 0.1285 0.6404 1.05
6 26,240 7 0.0612 0.410 0.674
4 41,740 7 0.0772 0.259 0.424
3 52,620 7 0.0867 0.205 0.336
2 66,360 7 0.0974 0.162 0.266
1 83,690 19 0.0664 0.129 0.211
0 105,600 19 0.0745 0.102 0.168
00 133,100 19 0.0837 0.0811 0.133
000 167,800 19 0.0940 0.0642 0.105
0000 211,600 19 0.1055 0.0509 0.0836
MCM 250 250,000 37 0.0822 0.0431 0.0708
300 300,000 37 0.09001 0.0360 0.0590
350 350,000 37 0.0973 0.0308 0.0505
400 400,000 37 0.1040 0.0270 0.0442
500 500,000 37 0.1162 0.0216 0.0354
600 600,000 61 0.0992 0.0180 0.0295
700 700,000 61 0.1071 0.0154 0.0253
750 750,000 61 0.1109 0.0144 0.0236
800 800,000 61 0.1145 0.0135 0.0221
900 900,000 61 0.1215 0.0120 0.0197
1000 1,000,000 61 0.1280 0.0108 0.0177
————————————————————————————————Figure 10-6. Voltage drop in on electrical circuit