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8 AWG copper is rated for 40 amps. Over 150 ft, at maximum current, the voltage drop would be about 3.76 volts. Using 6 AWG would have a voltage drop of 2.36 volts with the same 40 amps.

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Q: What wire size is used to make service connection from a 200 amp service panel to a 40 amp service panel 150 feet away?
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