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Years ago I worked for a mobile home company, for a 100A service we would install a 2/2/4 aluminum. Aluminum is higher resistance than copper, so you can go slightly smaller with copper. I would think no smaller than 4 gauge though, better too big than too small. This 220V 100A service was enough to run an entire 4 bedroom 2 bath home, A/C condenser and blower, dryer, etc.
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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