14 AWG voltage drop at 75 feet
Computed voltage drop for 14 AWG copper conductors on a 75 ft one-way run.
5.53 V
drop on 14 AWG copper, 75 ft one-way, 12 A load · 4.6% of 120 V · 2.3% of 240 V
14 AWG at 75 ft by load
| Load | Drop | % at 120 V | % at 240 V | 3% rule (240 V) |
|---|---|---|---|---|
| 3 A | 1.38 V | 1.2% | 0.6% | OK |
| 6 A | 2.76 V | 2.3% | 1.2% | OK |
| 9 A | 4.14 V | 3.5% | 1.7% | OK |
| 12 A | 5.53 V | 4.6% | 2.3% | OK |
Vd = 2 × length × R × I ÷ 1000, R = 3.07 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 14 AWG wire at 75 feet?
At 12 A (80% of its 15 A 75°C rating) 14 AWG copper drops 5.53 V over 75 ft one-way: 4.6% at 120 V or 2.3% at 240 V.
How far can I run 14 AWG at 12 amps?
To stay within 3% at 120 V, about 49 ft one-way; at 240 V about 98 ft.