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Wire size vs voltage drop - 240VAC

240 VAC WIRE SIZE

120 VAC PER LEG USING COPPER WIRE AND A 2% VOLTAGE DROP

AMPS VA #16 #14 #12 #10 #8 #6 #4 #2 1/0 2/0 3/0 4/0
1 120 281 448 712 1135 1800 2869 4549 7244 11564 14509 18327 23127
2 240 141 224 356 567 900 1435 2275 3622 5782 7255 9164 11564
3 360 94 149 237 378 600 956 1516 2415 3855 4836 6109 7709
4 480 70 112 178 284 450 717 1137 1811 2891 3627 4582 5782
5 600 56 90 142 227 360 574 910 1449 2313 2902 3665 4625
10 1200 28 45 71 113 180 287 455 724 1156 1451 1833 2313
15 1800   30 47 76 120 191 303 483 771 967 1222 1542
20 2400     36 57 90 143 227 362 578 725 916 1156
25 3000       45 72 115 182 290 463 580 733 925
30 3600       38 60 96 152 241 385 484 611 771
35 4200         51 82 130 207 330 415 524 661
40 4800         45 72 114 181 289 363 458 578
50 6000           57 91 145 231 290 367 463
60 7200             76 121 193 242 305 385
70 8400             65 103 165 207 262 330
80 9600               91 145 181 229 289
90 10800                 128 161 204 257
100 12000                 116 145 183 231
125 15000                 93 116 147 185
150 18000                 77 97 122 154
175 21000                   83 105 132
200 24000                     92 116
 
On the left column find the amps that your circuit must supply.  Then follow that row to the right until you find the distance of your circuit from the supply to the equipment you are feeding.  Don't forget to take into account going up and down walls and around any other obstacles.  Then follow it up to find your minimum wire size.
 
This chart is only intended to be an educational guide.  Consult the National Electric Code and other local ordinances.

 

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