Wire Size for 34.38 Amps
Typical copper and aluminum wire gauges for 34.38 amps across common run lengths on a 120V circuit, sized to keep voltage drop under 3% and respect the NEC 240.4(D) small-conductor rule. Actual install sizing depends on conductor material, insulation/termination temperature rating, cable type, ambient and bundling derates, and local code.
34.38A Wire Gauge by Distance
| Distance | Copper Gauge | Aluminum Gauge | V-Drop (Cu) | NEC Status |
|---|---|---|---|---|
| 25 ft | 8 AWG | 8 AWG | 1.34V (1.11%) | OK |
| 50 ft | 8 AWG | 6 AWG | 2.67V (2.23%) | OK |
| 75 ft | 6 AWG | 6 AWG | 2.53V (2.11%) | OK |
| 100 ft | 6 AWG | 4 AWG | 3.38V (2.81%) | OK |
| 125 ft | 4 AWG | 4 AWG | 2.65V (2.21%) | OK |
| 150 ft | 4 AWG | 3 AWG | 3.18V (2.65%) | OK |
| 175 ft | 3 AWG | 2 AWG | 2.95V (2.46%) | OK |
| 200 ft | 3 AWG | 2 AWG | 3.37V (2.81%) | OK |
| 250 ft | 2 AWG | 1 AWG | 3.33V (2.78%) | OK |
| 300 ft | 1 AWG | 1/0 AWG | 3.18V (2.65%) | OK |
| 400 ft | 1/0 AWG | 2/0 AWG | 3.36V (2.8%) | OK |
| 500 ft | 2/0 AWG | 3/0 AWG | 3.32V (2.77%) | OK |
Aluminum is not typical for 10 AWG and smaller branch-circuit conductors in residential settings. Copper gauges use the NEC 240.4(D) branch-circuit cap, not raw 75°C ampacity.
Also Calculate
Other Amperages
This calculator provides estimates for reference purposes only. Always consult a licensed electrician and verify compliance with the National Electrical Code (NEC) and local electrical codes before performing any electrical work.