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I have a 240 volt dryer currently, and I want to change it out for a gas dryer that will utilize 120 volt. Since the circuit is 240 volt 30 amp, I'd like to use the existing 6-8 gauge wire and pigtail it down to 12 gauge in the existing 2-gang box, and just cap the extra wire. Is this within code, or should I pull the romex and run new?

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    3 prong or 4 prong 30A dryer plug? – Ecnerwal May 15 at 17:02
  • Can you post a photo of the inside of the existing dryer receptacle box? – ThreePhaseEel May 15 at 17:24
  • It is 3 prong, but it has red, black, white, and ground from the service panel. – Fenderbridge May 15 at 18:05
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    @JaredTillford -- btw: is plugging the dryer into the same circuit as the washer not an option? – ThreePhaseEel May 15 at 18:29
  • What is the electric power consumption of the new gas dryer--watts or amps at 120 V? What is the power consumption of the washer? – Jim Stewart May 16 at 17:04
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I agree with Ed Beal, this is legit because you already have a separate neutral and ground wire. You must change the breaker to 20A. The receptacle size MUST match the breaker size (there is an exception to allow 20A breakers on dual 15A sockets, i.e. the common recep we use everywhere).

While you're in there, disconnect and cap off the unused red wire.

Feel free to use either a 1-pole or 2-pole breaker; if the latter you only connect one side of it. It just depends on what breakers you have, what spaces are available in the panel etc. DO NOT leave an empty gaping hole in your service panel face that curious fingers could reach into. If you have a hole, fill it with basically any breaker that is correct for your panel (blanking plates are $3.50, flimsy and hard to find, real breakers are $4.50/space and everywhere. Your call lol).

I say buy breakers since it's a thing you'll likely use later. Thus, make sure to use correct breakers, e.g. same brand: BR in BR, HOM in HOM, etc. They're all within $1 of each other so there's no big savings. While some will cross-"fit" they don't fit properly and will arc and burn the bus stab.

Oh, one more thing. The laundry room recep, since this is "new work", must be GFCI. That can happen either as a GFCI breaker ($40) or a GFCI recep ($18).

If you are putting a GFCI recep in a 2-gang steel box, get yourself a 1-gang "mud ring" not a domed cover.

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  • I like the way you think! Never thought about GFCI until now. Makes sense, I will certainly make it so. – Fenderbridge May 18 at 17:34
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You may be able to install a 120v receptacle but you would need to change the breaker to 20 amp how many wire is your existing feed would be my question if 4 wire yes you can convert if 3 wire it depends on the colors.

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  • It is 3 prong. from the service panel side, it is black, red, white, and bare ground. – Fenderbridge May 15 at 18:04
  • Well since you have your black white and ground Yes you can I would cap the red at both ends put a 20 amp breaker and pigtail with #12 as needed and you are good to go with the gas dryer. – Ed Beal May 15 at 18:11

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