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See Table NEC 310.16

but #6 copper is safe.

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Q: What size wire do you need to run for 220 volt 50 amp service at 100 feet?

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A 2/0 aluminum conductor, with an insulation factor of 90 degrees C, when supplying 100 amps for 200 feet on a 240 volt system, will work.

4 copper

The voltage is not as significant as the amperage. You'll need to decide the service size that you'll be sending to the house. It's always calculated in Amps.

12 AWG.

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A 3/0 copper conductor will limit the voltage drop to 3% or less when supplying 200 amps for 200 feet on a 240 volt system.

Service entrance wire size is AWG # 3 copper.

A 2/0 aluminum conductor, with an insulation factor of 90 degrees C, when supplying 100 amps for 200 feet on a 240 volt system, will work.

A #4 copper conductor will limit the voltage drop to 3% or less when supplying 30 amps for 400 feet on a 240 volt system.

A 1000 MCM copper conductor will limit the voltage drop to 3% or less when supplying 150 amps for 400 feet on a 120 volt system.

4 copper

The voltage is not as significant as the amperage. You'll need to decide the service size that you'll be sending to the house. It's always calculated in Amps.

A 300 MCM aluminum conductor will limit the voltage drop to3% or less when supplying 100 amps for 400 feet on a 240 volt system.

12 AWG.

A 500 MCM copper conductor will limit the voltage drop to 3% or less when supplying 200 amps for 400 feet on a 240 volt system.

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