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Old 05-30-2019, 12:09 PM   #1
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Neutral jumper between back-to-back switch boxes?


What's the easiest but correct way of bringing a neutral conductor from a switch box to another switch box almost directly behind it on the other side of the wall? Both boxes are a type of old work box that could be removed without damaging the drywall, and both switches are on the same branch circuit. Just wondering if there's a more elegant solution than running a short length of 14/2 Romex and capping the black on both ends.
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Old 05-30-2019, 12:42 PM   #2
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Re: Neutral jumper between back-to-back switch boxes?


Are you needing a neutral for a new dimmer? Or have you lost the neutral to part of the circuit?
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Old 05-30-2019, 12:47 PM   #3
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Re: Neutral jumper between back-to-back switch boxes?


It's for a new dimmer.
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Old 05-30-2019, 01:16 PM   #4
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Re: Neutral jumper between back-to-back switch boxes?


Take that dimmer back to the store and get a “no neutral required” dimmer.
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Old 05-30-2019, 01:16 PM   #5
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Re: Neutral jumper between back-to-back switch boxes?


You need to run the short length of 12-2 (14-2 for 15 am circuit) and use, not cap off, the black to supply hot to the subcircuit needing the neutral.
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Old 05-30-2019, 01:27 PM   #6
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Re: Neutral jumper between back-to-back switch boxes?


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You need to run the short length of 12-2 (14-2 for 15 am circuit) and use, not cap off, the black to supply hot to the subcircuit needing the neutral.
He needs a neutral at a switch leg what would he use the black for? He would have to pull the light and cap a black there.
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Old 05-30-2019, 02:15 PM   #7
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Re: Neutral jumper between back-to-back switch boxes?


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He needs a neutral at a switch leg what would he use the black for? He would have to pull the light and cap a black there.

Every cable is required to contain both supply and return such that
a clamp meter around the cable will always read zero. There are
exceptions that involve AL and/or fiber plates but they don't apply
here. Is it a rule I might cheat on in my own house....maybe...but
not if I could find a "no neutral req'd" dimmer as @Oso954 suggested.
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Old 05-30-2019, 02:42 PM   #8
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Re: Neutral jumper between back-to-back switch boxes?


The first and most important thing is the BOTH switches need to be on the SAME breaker. You can't bring a neutral from another circuit from one box to another.
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Old 05-30-2019, 04:01 PM   #9
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Re: Neutral jumper between back-to-back switch boxes?


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The first and most important thing is the BOTH switches need to be on the SAME breaker. You can't bring a neutral from another circuit from one box to another.
He said they were.
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Old 05-30-2019, 04:13 PM   #10
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Re: Neutral jumper between back-to-back switch boxes?


I can't return the dimmer, so would it be kosher to connect 14/2 Romex to both black and white wires in "box A," and then cap the black wire in "box B?" Could I also cut the ground wires all the way back to the cable jacket?
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Old 05-30-2019, 04:14 PM   #11
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Re: Neutral jumper between back-to-back switch boxes?


Quote:
Originally Posted by CodeMatters View Post
Every cable is required to contain both supply and return such that
a clamp meter around the cable will always read zero. There are
exceptions that involve AL and/or fiber plates but they don't apply
here. Is it a rule I might cheat on in my own house....maybe...but
not if I could find a "no neutral req'd" dimmer as @Oso954 suggested.

Thanks Code..... Never knew that.....(never had the issue, but learned something new)
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Old 05-30-2019, 04:21 PM   #12
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Re: Neutral jumper between back-to-back switch boxes?


Quote:
Originally Posted by CodeMatters View Post
Every cable is required to contain both supply and return such that
a clamp meter around the cable will always read zero. There are
exceptions that involve AL and/or fiber plates but they don't apply
here. Is it a rule I might cheat on in my own house....maybe...but
not if I could find a "no neutral req'd" dimmer as @Oso954 suggested.
I really can't imagine anyone checking a wire that is 6" between two boxes. But rules are rules. So run the power there and change the wire at the light.
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Old 05-30-2019, 04:48 PM   #13
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Re: Neutral jumper between back-to-back switch boxes?


Do not cut the grounds off. Connect all the grounds together in both boxes.
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Old 05-30-2019, 04:50 PM   #14
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Re: Neutral jumper between back-to-back switch boxes?


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Originally Posted by Sepp123 View Post
I can't return the dimmer, so would it be kosher to connect 14/2 Romex to both black and white wires in "box A," and then cap the black wire in "box B?" Could I also cut the ground wires all the way back to the cable jacket?

If you can't return it, why not just buy another?

And why cut off the ground wires?
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Old 05-30-2019, 11:25 PM   #15
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Re: Neutral jumper between back-to-back switch boxes?


I asked about cutting back the ground wire because it seemed superfluous to connect a ground jumper between two switches that are already grounded. But it's academic because I'm now convinced a non-neutral-needing dimmer switch is the way to go, all things considered.
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