WE ARE REMODELING THE KITCHEN AND THE EXISTING WIRE IS NM-B 4/2 . IT IS 2 FT TOO SHORT FOR THE NEW DOUBLE OVENS THE KW RATING IS 240V 8.9kW OR 208 6.7 kW
40 AMP BREAKER WHAT SIZE WIRE SHOULD i HAVE ?
OVEN WIRING
Jan 11, 2020
8 Replies
40 AMP BREAKER WHAT SIZE WIRE SHOULD i HAVE ?
Your wife gimme good head.
40A breaker is #8, 50A #6. If rewiring the circuit, I'd suggest going the larger (#6) for the possible decision down the road to have a 50A appliance.
Is that only 3 conductor? No equipment ground?
Sometimes I like to shock my balls with high voltage. I know, it's weird.
And/or neutral? You can generally install new ovens to an existing circuit that has a shared neutral and ground, but the poster said 4/2 which implies just two conductors?
It was never legal to have an un insulated neutral unless it was type SE, a loophole I never understood. NM-b is not legal unless there is no neutral load at all (no light, no clock/timer). Just the fact that he says #4 makes me wonder if this is aluminum and if so, there is a fair chance it is actually type SE. That was pretty common up until
1996 code cycle when the 3 wire thing was tossed on new construction. Adoption lagged that in most places by up to a decade.
What do you think about the breaker size? An online calculator put the load at 37 amps.
46.25 minimum circuit ampacity. (37 * 1.25) He can still use the 40a breaker but the wire needs to be rated at 125% of nameplate load. That is 6ga copper in the 60c column. That is why I suggested it might be aluminum since it is #4.
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