10 AWG voltage drop at 75 feet
Computed voltage drop for 10 AWG copper conductors on a 75 ft one-way run.
4.36 V
drop on 10 AWG copper, 75 ft one-way, 24 A load · 3.6% of 120 V · 1.8% of 240 V
10 AWG at 75 ft by load
| Load | Drop | % at 120 V | % at 240 V | 3% rule (240 V) |
|---|---|---|---|---|
| 6 A | 1.09 V | 0.9% | 0.5% | OK |
| 12 A | 2.18 V | 1.8% | 0.9% | OK |
| 18 A | 3.27 V | 2.7% | 1.4% | OK |
| 24 A | 4.36 V | 3.6% | 1.8% | OK |
Vd = 2 × length × R × I ÷ 1000, R = 1.21 Ω/1000 ft (copper, NEC Ch. 9 Table 8). Aluminum is about 1.6× higher.
Same wire, other distances
25 ft · 50 ft · 100 ft · 125 ft · 150 ft · 200 ft · 250 ft · 300 ft
FAQ
What is the voltage drop on 10 AWG wire at 75 feet?
At 24 A (80% of its 30 A 75°C rating) 10 AWG copper drops 4.36 V over 75 ft one-way: 3.6% at 120 V or 1.8% at 240 V.
How far can I run 10 AWG at 24 amps?
To stay within 3% at 120 V, about 62 ft one-way; at 240 V about 124 ft.