Wire Size for 1,000 Amps

Typical copper and aluminum wire gauges for 1,000 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.

1,000A Wire Gauge by Distance

DistanceCopper GaugeAluminum GaugeV-Drop (Cu)NEC Status
25 ftExceeds available gauges
50 ftExceeds available gauges
75 ftExceeds available gauges
100 ftExceeds available gauges
125 ftExceeds available gauges
150 ftExceeds available gauges
175 ftExceeds available gauges
200 ftExceeds available gauges
250 ftExceeds available gauges
300 ftExceeds available gauges
400 ftExceeds available gauges
500 ftExceeds available gauges

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

electric_bolt 1,000A to watts at 120V trending_down Voltage drop calculator

Other Amperages

10A 15A 20A 25A 30A 40A 50A 60A 70A 80A 100A 125A 150A 175A 200A 225A 250A 300A 350A 400A
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.
person Written by Sean Day verified Reviewed by WireResult update Last updated Apr 11, 2026