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Old 07-25-2009, 08:48 AM   #1
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Conflicting info on using 10-3


My electrical official at the compliance office suggested that I can use the existing 10-3+ ground dryer homerun to satisfy requirement for (2) dedicated 20A GFCI circuits in my laundry area. He said I need to share the neutral. The info I've seen disagrees whether to use separate 120v 20A breakers in the box or to maintain a 240v 20A double-pole breaker. There is a junction box in the bathroom where I will obviously need to pigtail the neutral wire of the 10-3 to both the 12-2 wires. Can someone advise me how to do this in a residential situation? BTW, we are using NG for the dryer, the 10-3 has been unused for 15 years but is intact with a 30A double-pole breaker.

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Old 07-25-2009, 08:54 AM   #2
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Conflicting info on using 10-3


Under the 2008 NEC you must use a 2-pole breaker.
Although not always mandatory, in any case it is a good idea.

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Answers based on the 2008 & 2011 NEC.
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Old 07-25-2009, 09:07 AM   #3
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Conflicting info on using 10-3


Yes, you would need to replace the 30a double pole with a 20a double pole
I'm aware of the requirement for a single dedicated laundry circuit
Why is he asking for a 2nd circuit?
You mention a laundry area then talk about a bathroom?
Are you running one circuit to the laundry area & one to the bathroom?

One 12-2 goes to one area, black to black, white to white, ground to ground
2nd 12-2 to other area, black to RED, white to white, ground to ground
Bathroom must be GFCI protected
Laundry outlet if within 6' of a sink must be GFCI

Last edited by Scuba_Dave; 07-25-2009 at 01:23 PM. Reason: error 12-2 to be used
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Old 07-25-2009, 09:29 AM   #4
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Conflicting info on using 10-3


I've divided the old "large" laundry room and "miniscule" powder room into a full bath for the new master suite and a combination powder room/ laundry room (laundry equipment in 3x5 closet). I have the GFCI's covered already for the bathroom requirement and was aware of the requirement for the washing machine. The official said I also need a dedicated GFCI for the dryer. I am operating under a homeowner self-permit. In short, I don't know "all" about electrical codes, etc... I'm assuming he's told me what he wants to see, as far as a dedicated GFCI for both washer and dryer. There is (1) 20A 120V single pole home-run circuit to supply (2) GFCI in the back to back bathrooms, and the 10-3 will supply the washer/dryer split into (2) GFCI's, at least that's what my E.I. suggested and I'm taking his advice as something that will get me a green-tag.
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Old 07-25-2009, 11:02 AM   #5
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Conflicting info on using 10-3


A laundry area does require a dedicated circuit & that circuit can't leave the laundry area.
If the laundry area is now in a 3x5 closet then the circuit can't leave that closet
Dryer you stated is gas, so you need a 120v connection
The dedicated circuit can feed both the washer & dryer

There isn't anything that indicates a need for 2 circuits
Unless it is a local requirement
OR
The washer takes up a lot of power

But in the end you need to do what makes the Inspector happy

Last edited by Scuba_Dave; 07-25-2009 at 01:23 PM. Reason: sp
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Old 07-25-2009, 12:51 PM   #6
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Conflicting info on using 10-3


What they said....plus

Make sure the 10/12/12 neutral connection is bulletproof. Lose the neutral there and you will damage some equipment.
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Old 07-25-2009, 10:23 PM   #7
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Conflicting info on using 10-3


It may be local code in Indianapolis to have (2) dedicated circuits for laundry, or it may be my own special requirement, I don't really know. I didn't think it made sense to require a dedicated circuit for the dryer, but it's not a big deal with the wiring already there. I have plenty of home-runs: (1) for smokes, (3) separate GFCI's in the bathrooms and laundry, and still have (3) circuits for the bedroom, study, and sitting room.

Thanks for the assistance, folks.

Before I forget. One of the 20A circuits is a double-pole with 12-2 wire. Can I move the white wire to the neutral bus and leave the double breaker in place, rather than purchase a single pole breaker and blank? The other 4 circuits are all 20A single pole breakers with 12-2.
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Old 07-26-2009, 08:39 PM   #8
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Conflicting info on using 10-3


Quote:
Originally Posted by NailedIt View Post

Before I forget. One of the 20A circuits is a double-pole with 12-2 wire. Can I move the white wire to the neutral bus and leave the double breaker in place, rather than purchase a single pole breaker and blank? The other 4 circuits are all 20A single pole breakers with 12-2.

Yes. We may get called a hack for doing it that way, but it can be done.
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Old 07-27-2009, 06:41 PM   #9
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Conflicting info on using 10-3


maybe so...

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