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I would recommend no smaller than #8awg copper. This is derived by 8awg copper ampacity of 40 amps multiplied by 80% load rating to get 32 amps. Then calculating for voltage drop over this distance shows a drop of 5.9 volts or 2.5% which is negligible so not accounted for. So like i said no smaller than #8awg copper.

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15y ago
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6mo ago

For a 110 volt 20 amp circuit running 700 ft, it is recommended to use a wire size of 8 AWG (American Wire Gauge) to ensure that voltage drop is within an acceptable range. This will help maintain a safe and efficient electrical system for the circuit over that distance.

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13y ago

This is a voltage drop question. A #2/0 copper conductor will limit the voltage drop to 3% or less when supplying 20 amps for 700 feet on a 110 volt system.

If there is a possibility of using a 220 volt source the wire size can be changed to a #3 copper conductor will limit the voltage drop to 3% or less when supplying 20 amps for 700 feet on a 220 volt system.

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10y ago

Answer Using stranded copper: Minimum of 2 AWG

Using stranded aluminium: Minimum of 4/0 AWG.

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10y ago

A #1 copper conductor will limit the voltage drop to 3% or less when supplying 30 amps for 700 feet on a 240 volt system.

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10y ago

A #8 copper conductor will limit the voltage drop to 3% or less when supplying 28 amps for 140 feet on a 240 volt system.

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13y ago

This is a voltage drop question. A #2/0 copper conductor will limit the voltage drop to 3% or less. This calculation is for supplying 20 amps over 700 feet using a 110 volt system.

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Q: What size wire for 110 volt 20 amp circuit 700ft?
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