6 AWG voltage drop at 300 feet
Computed voltage drop for 6 AWG copper conductors on a 300 ft one-way run.
15.32 V
drop on 6 AWG copper, 300 ft one-way, 52 A load · 12.8% of 120 V · 6.4% of 240 V
6 AWG at 300 ft by load
| Load | Drop | % at 120 V | % at 240 V | 3% rule (240 V) |
|---|---|---|---|---|
| 13 A | 3.83 V | 3.2% | 1.6% | OK |
| 26 A | 7.66 V | 6.4% | 3.2% | OK at 240 V up to 5% |
| 39 A | 11.49 V | 9.6% | 4.8% | OK at 240 V up to 5% |
| 52 A | 15.32 V | 12.8% | 6.4% | 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 · 250 ft
FAQ
What is the voltage drop on 6 AWG wire at 300 feet?
At 52 A (80% of its 65 A 75°C rating) 6 AWG copper drops 15.32 V over 300 ft one-way: 12.8% at 120 V or 6.4% 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.