How To Calculate Voltage Drop with a Copper Conductor
Use the following formula as a guide for calculating the voltage drop of a copper conductor.
Voltage Drop = Power Factor x Amps x Feet / 100
| Copper Conductor: 80% Power Factor |
| Wire Size |
Single Phase |
Three Phase |
| 14 AWG |
0.4762 |
0.4167 |
| 12 AWG |
0.3125 |
0.2632 |
| 10 AWG |
0.1961 |
0.1677 |
| 8 AWG |
0.1250 |
0.1087 |
| 6 AWG |
0.0833 |
0.0714 |
| 4 AWG |
0.0538 |
0.0463 |
| 3 AWG |
0.0431 |
0.0379 |
| 2 AWG |
0.0370 |
0.0323 |
| 1 AWG |
0.0323 |
0.0278 |
| 1/0 AWG |
0.0269 |
0.0231 |
| 2/0 AWG |
0.0222 |
0.0196 |
| 3/0 AWG |
0.0190 |
0.0163 |
| 4/0 AWG |
0.0161 |
0.0139 |
| 250 MCM |
0.0147 |
0.0128 |
| 300 MCM |
0.0131 |
0.0114 |
| 350 MCM |
0.0121 |
0.0106 |
| 400 MCM |
0.0115 |
0.0091 |
| 500 MCM |
0.0101 |
0.0088 |