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Wire size for 50 amps at 100 feet

50 A at 100 ft one-way

Voltage	Conductor	Minimum size	Voltage drop
120 V	Copper	4 AWG	3.08 V (2.57%)
120 V	Aluminum	2 AWG	3.19 V (2.66%)
240 V	Copper	6 AWG	4.91 V (2.05%)
240 V	Aluminum	4 AWG	5.08 V (2.12%)

Smallest size meeting NEC 75 °C ampacity (with 240.4(D) limits) and ≤3% drop at the full 50 A. Use 125% sizing for continuous loads; apply derating for more than 3 current-carrying conductors or high ambient temperature.

Adjust the numbers

Load current (amps)

One-way length (feet)

Voltage

Conductor

Max voltage drop (%)

Continuous load?

FAQ

What size wire for 50 amps at 100 feet?

At 240 V: 6 AWG copper keeps voltage drop under 3%. See the table for 120 V and aluminum.

Same current, other distances

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