Electric Range Demand Factor

Barbqranch

Senior Member
Here's what I would do: keep the existing cable, put in a 40a breaker, and be done.

You're never going to have every element on simultaneously.
With a double oven, it is quite likely they will both be turned on at the same time, and it can take 5 to 10 minutes before they start to cycle.
 

powerpete69

Senior Member
Agreed Pete. Your argument that "the NEC is not privy to the internals of the unit" is exactly why I agreed with both Dennis' first response and your comment here that the manufacturer's specs supersede the NEC. Well put that ""the NEC is not privy to the internals of the unit." Makes perfect sense.

It's about a 90ft run in wire length. I realize I'm getting up there and voltage drop comes into play, but not enough for me to be concerned about increasing the conductor size from a #8 on a 32.5A load. If it were a 38A load, I'd run the VD and see if I need to increase the wire size, but I feel confident #8 will suffice.

Interesting stipulation though that distance of the run / voltage drop could force your hand in sizing the circuit larger than the manufacturer requires. I suppose that would be a case in which the NEC beats the manufacturer's specifications :)
Just to confirm, the 40A breaker size will not change no matter what the distance. Just the wire size will increase as distance increases to keep the voltage at the level they desire. #8 wire is technically good for 50 amps, so you will have no problem whatsoever at 90 ft.
 
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