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Old 04-19-2010, 06:50 AM   #1
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splitting 12-3 wire

I want to feed two circuits with a single home run using 12-3 wire to two circuits in a kitchen, one is for a ac (window unit) the other circuit is for the fridge, both will be single outlets, nothing else run or any other outlets, question is can I place a 4" box in the wall without future access to split the circuits?


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Old 04-19-2010, 07:17 AM   #2
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splitting 12-3 wire

Absolutely not. A junction box MUST be accessible.

Why not just go to the first one, and then on to the next? Why bother with another box at all?


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Old 04-19-2010, 07:18 AM   #3
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splitting 12-3 wire


-As a rule, electrical connections can fail and might need maintenance. Needs to be accessible in the future.

-When there are problems with an electric circuit, sometimes you need to disconnect wires for troubleshooting. And you need access to the wiring connections to do this.

-Electrical circuits often need to be changed or added onto. You would need access to the junction boxes to do this.

-Murphy was right!

Also what you are talking about is called a MultiWire Branch Circuit or MWBC. Might want to read about that as there are *important* safety considerations...

MWBC and new electrical code rules...
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Old 04-19-2010, 08:25 AM   #4
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splitting 12-3 wire

Unless you have experience with electrical work, I'd advise against a MWBC (two circuits sharing a neutral). Like Billy_Bob said, there are very important safety considerations to take, including pigtailing outlets and using a double-pole breaker (or handle ties).

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Old 04-19-2010, 05:16 PM   #5
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splitting 12-3 wire

no it is not feasible to go from one circuit, then on to the next, I also thought that it had to be accessible, however I do not have any issues as to sharing the neutral, been there and done that, yes I do double pole the breaker, but if it were a normal circuit for multiple outlets then the home runs would be separate, this however is only one outlet per circuit. I was just trying to avoid multiple runs in a old wall, It looks like I will be doubling up the wall thickness anyhow.
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Old 04-19-2010, 07:14 PM   #6
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splitting 12-3 wire

run to the first recep box and then backtrack to the point you were considering putting a junction box and then going to the second recep location. It takes more wire, of course, but it prevents a buried junction box and still allows the use of the MWBC.


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