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125 Amp Breaker Wire Size

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125 Amp Breaker Wire Size. I m looking for suggestions on wire size this is what was given to me by a friend of mine. I will be installing a 100amp breaker in my main panel.

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The run is no more than 100ft. The run will be about 100 feet and the breaker boxes are 125 amp. What size wire should i use in aluminum as it is cheaper.

What size wire should i use in aluminum as it is cheaper.

I understand i could use a 125 amp breaker but i do not need the additional amperage. Breaker size wire size based on copper thhn wire increase one size when using aluminum conductors at 115 volts at 230 volts 15 amp 14 1 380 2 760 20 amp 12 1 840 3 680 30 amp 10 seldom used on 115 voltage 5 520 40 amp 8 seldom used on 115 voltage 7 360 50 amp 6 seldom used on 115 voltage 9 200 60 amp 6 seldom used on 115 voltage. I m looking for suggestions on wire size this is what was given to me by a friend of mine. What size wire should i use in aluminum as it is cheaper.

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