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Wire size for 150 amps at 100 feet

150 A at 100 ft one-way

Voltage	Conductor	Minimum size	Voltage drop
120 V	Copper	2/0 AWG	2.90 V (2.42%)
120 V	Aluminum	4/0 AWG	3.00 V (2.50%)
240 V	Copper	1/0 AWG	3.66 V (1.53%)
240 V	Aluminum	3/0 AWG	3.78 V (1.57%)

Smallest size meeting NEC 75 °C ampacity (with 240.4(D) limits) and ≤3% drop at the full 150 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 150 amps at 100 feet?

At 240 V: 1/0 AWG copper keeps voltage drop under 3%. See the table for 120 V and aluminum.

Same current, other distances

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