| Copper Conductor - 90% Power Factor |
| AWG |
Single Phase |
Three Phase |
AWG |
Single Phase |
Three Phase |
| 14 |
.4762 |
.4167 |
1/0 |
.0269 |
.0231 |
| 12 |
.3125 |
.2632 |
2/0 |
.0222 |
.0196 |
| 10 |
.1961 |
.1677 |
3/0 |
.0190 |
.0163 |
| 8 |
.1250 |
.1087 |
4/0 |
.0161 |
.0139 |
| 6 |
.0833 |
.0714 |
250 |
.0147 |
.0128 |
| 4 |
.0538 |
.0463 |
300 |
.0131 |
.0114 |
| 3 |
.0431 |
.0379 |
350 |
.0121 |
.0106 |
| 2 |
.0323 |
.0278 |
400 |
.0115 |
.0091 |
| 1 |
.0323 |
.0278 |
500 |
.0101 |
.0088 |
How to use the Voltage Drop Table:
The Voltage drop table above gives you a factor to use when sizing wire.
The formula you use is the following:
Factor (from table) X Amps X feet of run = Voltage drop over 1000.
For example: 14 gauge wire at 15 amps for a 500 foot run.
.4762 X 15 X 500 feet = 3,571.5 over 1000 or a 3.5715 voltage drop.
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