6 AWG voltage drop at 25 feet
Computed voltage drop for 6 AWG copper conductors on a 25 ft one-way run.
1.28 V
drop on 6 AWG copper, 25 ft one-way, 52 A load · 1.1% of 120 V · 0.5% of 240 V
6 AWG at 25 ft by load
| Load | Drop | % at 120 V | % at 240 V | 3% rule (240 V) |
|---|---|---|---|---|
| 13 A | 0.32 V | 0.3% | 0.1% | OK |
| 26 A | 0.64 V | 0.5% | 0.3% | OK |
| 39 A | 0.96 V | 0.8% | 0.4% | OK |
| 52 A | 1.28 V | 1.1% | 0.5% | OK |
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
50 ft · 75 ft · 100 ft · 125 ft · 150 ft · 200 ft · 250 ft · 300 ft
FAQ
What is the voltage drop on 6 AWG wire at 25 feet?
At 52 A (80% of its 65 A 75°C rating) 6 AWG copper drops 1.28 V over 25 ft one-way: 1.1% at 120 V or 0.5% 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.