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Old 03-03-2013, 02:05 PM   #1
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Single wall oven 3 or 4 wire rough-in


We had our cabinets built with an opening to allow a future single wall oven. Just remove doors and shelves for the oven RO. The Cadillac of single convection wall ovens that we would use pulls 22.6A at 240V. So I am roughing in a 30A circuit. I'm using Smurf ENT and pulling seperate conductors. Is a wall oven similar to freestanding range and require 4 conductors? Also would a #14 ground be sufficient? thanks pros.

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Old 03-03-2013, 02:12 PM   #2
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Single wall oven 3 or 4 wire rough-in


Ground would need to be #10 CU for a 30A circuit. As for 3/4 wire...there would be no way to tell you without the specs or model.

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Old 03-03-2013, 02:32 PM   #3
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Single wall oven 3 or 4 wire rough-in


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Ground would need to be #10 CU for a 30A circuit. As for 3/4 wire...there would be no way to tell you without the specs or model.
Thanks kbuz, I wasn't sure if there was a standard. This would be our first wall oven. I found the installation manual off the Whirlpool website and it looks like a 4 wire. Looking at the Whirlpool Gold true convection WOS92EC7AB
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Old 03-03-2013, 03:13 PM   #4
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Single wall oven 3 or 4 wire rough-in


Typically if the oven is 240 VAC only, it takes a 3 wire circuit (2 hots and a ground).

If it is 120/240 VAC, it takes a 4 wire circuit (2 hots, a neutral and a ground).

You can always future proof the installation and run the neutral even if you do not require it for the current installation.
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Old 03-03-2013, 03:30 PM   #5
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Single wall oven 3 or 4 wire rough-in


Pull four wires and you wont have to worry about it.
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Old 03-03-2013, 03:43 PM   #6
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Single wall oven 3 or 4 wire rough-in


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Pull four wires and you wont have to worry about it.
I agree, pull all 4 wires, even if you need only 3.

You can always cap off the neutral if it's not needed and if it sits there for the next 100 years, who cares? But if you pull only 3 wires, and when the oven is replaced, the new one needs 4, that's trouble.

Even worse, if the new oven needs 4 wires and there's only 3, most handyman types (and sadly, a lot of pros) will simply use the ground for the neutral also. That's unsafe.

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Old 03-03-2013, 03:49 PM   #7
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Single wall oven 3 or 4 wire rough-in


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Even worse, if the new oven needs 4 wires and there's only 3, most handyman types (and sadly, a lot of pros) will simply use the ground for the neutral also. That's unsafe.
good point

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