2 AWG voltage drop at 300 feet
Computed voltage drop for 2 AWG copper conductors on a 300 ft one-way run.
10.71 V
drop on 2 AWG copper, 300 ft one-way, 92 A load · 8.9% of 120 V · 4.5% of 240 V
2 AWG at 300 ft by load
| Load | Drop | % at 120 V | % at 240 V | 3% rule (240 V) |
|---|---|---|---|---|
| 23 A | 2.68 V | 2.2% | 1.1% | OK |
| 46 A | 5.35 V | 4.5% | 2.2% | OK |
| 69 A | 8.03 V | 6.7% | 3.3% | OK at 240 V up to 5% |
| 92 A | 10.71 V | 8.9% | 4.5% | 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 · 250 ft
FAQ
What is the voltage drop on 2 AWG wire at 300 feet?
At 92 A (80% of its 115 A 75°C rating) 2 AWG copper drops 10.71 V over 300 ft one-way: 8.9% at 120 V or 4.5% 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.