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A #1 copper conductor is rated at 140 amps with an insulation rating factor of 90 degrees C at 240 volt single phase, will give you a full 100 amps at 200 feet. #4 wire should give you 95 amps. Anything over 200 feet you will start loosing more amps.

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14y ago
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Anonymous

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3y ago
WHAT ABOUT # 2 THHN CU WIRE
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11y ago

This is a voltage drop question. A voltage value needs to be stated. Assuming that the 100 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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10y ago

AWG #6 will work fine at 100 feet with only a 2% drop in voltage which is acceptable.

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Anonymous

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3y ago

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Q: What size wire for a 100 amp sub panel 40 ft away?
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