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It depends on the amperage you are needing at the outlet. Electrical wires have resistance, which eats up current. Longer wires have more resistance simply because they are longer and need to draw more power at the source in order for the correct amount of power to reach the outlet.

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9y ago
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12y ago

To answer this question the voltage at the travel trailer needs to be stated.

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12y ago

This is a voltage drop question. A voltage must be stated to answer this question.

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9y ago

A 250 MCM copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 300 feet on a 120 volt system.

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Q: What size wire do you need to run for 30 amp service to travel trailer 400 feet?
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