(4 wire whip) double oven , 3 wire circuit

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Stevenfyeager

Senior Member
Location
United States, Indiana
Occupation
electrical contractor
Normally for dryers, and ranges its easy to change 3 wire to 4 wire or VVersa. But on this 30 year old double oven, I'm not sure how to change i. It comes with a 4 wire whip with instructions saying 3 wire circuit. My worker says its not obvious how to get into the appliance to change like we usually do for ranges and dryers.
Any suggestions ?
 
Are they saying 3 wire circuit to mean B-R-W, and not counting G... like a 12/3NM cable label? do you have 4 wires at the outlet? make and model of the oven?
 
I wired a few permanently connected ovens and cooktops back in the 80's in large custom homes. This was prior to the '96 code change that no longer allowed us to ground through the frames of ranges and dryers. Even then, the appliance manufacturers had a separate EGC in the whip of the appliance. I would just install a 4" sq. box in the cabinet behind the appliance and make the connection with wirenuts. According to NEC Art. 422.31 (A) & (B), this is still allowed as long as you install a breaker lock on the OCPD.
 
Every built in oven or cooktop that I've ever wired has had instructions on how to wire it to a 3-wire circuit. It has already been mentioned that you just connect the neutral and EGC in the junction box.
 
Little Bill said:
Every built in oven or cooktop that I've ever wired has had instructions on how to wire it to a 3-wire circuit. It has already been mentioned that you just connect the neutral and EGC in the junction box.
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This. Short of installing a new feed, only way to do it, using the neutral to ground cooking appliances is permitted in existing installations.
 
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