2 AWG voltage drop at 250 feet
Computed voltage drop for 2 AWG copper conductors on a 250 ft one-way run.
8.92 V
drop on 2 AWG copper, 250 ft one-way, 92 A load · 7.4% of 120 V · 3.7% of 240 V
2 AWG at 250 ft by load
| Load | Drop | % at 120 V | % at 240 V | 3% rule (240 V) |
|---|---|---|---|---|
| 23 A | 2.23 V | 1.9% | 0.9% | OK |
| 46 A | 4.46 V | 3.7% | 1.9% | OK |
| 69 A | 6.69 V | 5.6% | 2.8% | OK |
| 92 A | 8.92 V | 7.4% | 3.7% | OK at 240 V up to 5% |
Vd = 2 × length × R × I ÷ 1000, R = 0.194 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 2 AWG wire at 250 feet?
At 92 A (80% of its 115 A 75°C rating) 2 AWG copper drops 8.92 V over 250 ft one-way: 7.4% at 120 V or 3.7% at 240 V.
How far can I run 2 AWG at 92 amps?
To stay within 3% at 120 V, about 101 ft one-way; at 240 V about 202 ft.