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This is a voltage drop question. A voltage value needs to be stated. Assuming that the 200 amp panel is a single phase 120/240 volt sub panel. A #1 copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 200 feet on a 240 volt system.

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โˆ™ 2011-09-25 00:57:13
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Q: What size wire for 100 amp panel 200 feet away from a 200 amp service?
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