Look at this chart on wire size: https://www.electricaltechnology.org Understanding 40 amp wire size: importance, guidelines, and Copper 100 amp wire size chart
40 Amp Wire Size: 40A Wire Gauge For 220, 240 Volt Circuit (+ NEC Code)
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40 amp wire size: 40a wire gauge for 220, 240 volt circuit (+ nec code)Electric wire sizing chart .
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