Wire & cable buying guide at menards® Look at this chart on wire size: https://www.electricaltechnology.org 40 amp wire size: 40a wire gauge for 220, 240 volt circuit (+ nec code) ground wire size for 40 amp circuit
40 Amp Wire Size: 40A Wire Gauge For 220, 240 Volt Circuit (+ NEC Code)
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Ground wire size for 40 amp circuit
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