6 AWG voltage drop at 250 feet
Computed voltage drop for 6 AWG copper conductors on a 250 ft one-way run.
12.77 V
drop on 6 AWG copper, 250 ft one-way, 52 A load · 10.6% of 120 V · 5.3% of 240 V
6 AWG at 250 ft by load
| Load | Drop | % at 120 V | % at 240 V | 3% rule (240 V) |
|---|---|---|---|---|
| 13 A | 3.19 V | 2.7% | 1.3% | OK |
| 26 A | 6.38 V | 5.3% | 2.7% | OK |
| 39 A | 9.57 V | 8.0% | 4.0% | OK at 240 V up to 5% |
| 52 A | 12.77 V | 10.6% | 5.3% | Upsize |
Vd = 2 × length × R × I ÷ 1000, R = 0.491 Ω/1000 ft (copper, NEC Ch. 9 Table 8). Aluminum is about 1.6× higher.
Same wire, other distances
25 ft · 50 ft · 75 ft · 100 ft · 125 ft · 150 ft · 200 ft · 300 ft
FAQ
What is the voltage drop on 6 AWG wire at 250 feet?
At 52 A (80% of its 65 A 75°C rating) 6 AWG copper drops 12.77 V over 250 ft one-way: 10.6% at 120 V or 5.3% at 240 V.
How far can I run 6 AWG at 52 amps?
To stay within 3% at 120 V, about 70 ft one-way; at 240 V about 141 ft.