So you need TWO separate double-pole 40 amp breakers. 120/240-VOLT RANGE RECEPTACLE This layout is for a 40- or 50-amp, 120/240-volt dedicated appliance circuit wired with 8/3 or 6/3 cable, as required by code. It sounds, though, as if this water heater requires TWO separate 40A 240V circuits - 80A total. We use 9.6kW here because the table 220.55 sizing overrides the normal continuous-load provisions in the NEC, by the way. A 40-amp double-pole breaker is 40 amps on each leg. For ranges individually rated more than 12 kW but not more than 27 kW, the maximumĭemand in Column C shall be increased 5 percent for each additional kilowatt of rating or major fraction thereof by which the rating of individualįrom this, we get a 15% upward adjustment on the Column C value, or 8kW * 1.15 = 9.2kW, which is less than the 9.6kW a 40A circuit can handle, so the OP is good to go.
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