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What Size Wire for 70 Amp Breaker

August 24, 2022 by Charles Clark Leave a Comment

A gauge 3 aluminum or a gauge 4 copper makes a perfect choice for a 70 Amp breaker assuming there aren’t other factors impacting the performance, such as material and temperature.

What Size Wire for 70 Amp Breaker

What Size Wire for 70 Amp Breaker

Before you decide to upgrade the breaker you need to consider whether your wires can take the load or not. Considering there aren’t other factors impacting the performance, the right wire is either a gauge 3 aluminum or a gauge 4 copper for 70 amp. At an ambient temperature of 140°F,  you can use 4-gauge copper for a circuit breaker with this rating.

Rule of Thumb

General rule of thumb is an uncomplicated way to measure and choose wirings. Have a look at the chart below to find the right wirings, based on conductor temperatures taken from the NEC 310.16.

Ground wire, service entrance, circuit, breaker size chart rating:

Service or Feeder Rating (amp)Aluminum conductorCopper conductor
70#2 AWG#4 AWG
80#1 AWG#3 AWG
100#1/0 AWG#1 AWG
125#3/0 AWG#1/0 AWG
150#4/0 AWG#3/0 AWG
200350 kcmil250 kcmil
300700 kcmil500 kcmil
4001,250 kcmil750 kcmil
6002,000 kcmil (194°F)1,500 kcmil (167°F)

Check out the list below to check which wires are best for you regarding different voltage, distance, and materials.

Volt with 70 AmpsMax DistanceAWG(Copper)Aluminum
120V95 ft4AWG2AWG
240V191ft4AWG2AWG
480V383 ft4AWG2AWG
Volt with 70 AmpsMax DistanceAWG(Copper)Aluminum
120V120 ft3AWG1AWG
240V241ft3AWG1AWG
480V483 ft3AWG1AWG
Volt with 70 AmpsMax DistanceAWG(Copper)Aluminum
120V152 ft2AWG1/0AWG
240V302ft2AWG1/0AWG
480V609 ft3AWG1/0AWG

Voltage Drop is 3%, Line=Single phase

Wire size for 70 Amp 3 Phase

Volt with 70 AmpsMax DistanceAWG(Copper)Aluminum
120V150 ft2AWG1/0WG
240V150ft4AWG2AWG
480V150ft4AWG2AWG

Voltage Drop is 3%, Line=3 phase

To Conclude

After you select the right size of your wire you can select either the flexible aluminum option or high-conducting and robust copper. Make sure to consider price and safety measures before buying the wires and other components for your project.

Filed Under: Basics, Wiring

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