Wiring - Determining Wire Size and Voltage Drop for Amps - 480/277 VAC

480 VAC WIRE SIZE

240 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
1 120 563 897 1425 2269 3600 5738 9098 14487 23127 29018 36655 46255
2 240 281 448 712 1135 1800 2869 4549 7244 11564 14509 18327 23127
3 360 188 299 475 756 1200 1913 3033 4829 7709 9673 12218 15418
4 480 141 224 356 567 900 1435 2275 3622 5782 7255 9164 11564
5 600 113 179 285 454 720 1148 1820 2897 4625 5804 7331 9251
10 1200 56 90 142 227 360 574 910 1449 2313 2902 3665 4625
15 1800   60 95 151 240 383 607 966 1542 1935 2444 3084
20 2400     71 113 180 287 455 724 1156 1451 1833 2313
25 3000       91 144 230 364 579 925 1161 1466 1850
30 3600       76 120 191 303 483 771 967 1222 1542
35 4200         103 164 260 414 661 829 1047 1322
40 4800         90 143 227 362 578 725 916 1156
50 6000           115 182 290 463 580 733 925
60 7200             152 241 385 484 611 771
70 8400             130 207 330 415 524 661
80 9600               181 289 363 458 578
90 10800                 257 322 407 514
100 12000                 231 290 367 463
125 15000                 185 232 293 370
150 18000                   193 244 308
175 21000                   166 209 264
200 24000                     183 231
 
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.

Next Steps

Go to the Control and Power Wiring Lesson series to select your next lesson.  There are also many other Lesson Series on PLC Programming and Industrial Automation.

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