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Old 05-29-2013, 12:01 PM   #1
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Dishwasher and Disposal Wiring


Currently, we are doing a kitchen remodel and I want to move the dishwasher outlet from behind the dishwasher into the sink base. There is a 12/3 circuit that feeds both. Can I just move that line into the disposer gang box and wire the top outlet for the disposer and the bottom outlet for the dishwasher or should they really be in their own gang boxes?

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Old 05-29-2013, 12:16 PM   #2
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Dishwasher and Disposal Wiring


Curiosity, I'm assuming when you say 12/3, this is a MWBC and the DW and disposer are on different legs and maybe even dedicated circuts.

I am uncertain to code, which I believe your question is adressing, but I think that is not prohibited.Although as to splitting the device, I really am uncertain.

This is nothing other than unsubstantiated personal opinion, but I sure like to try and keep that 240 out of the same box, let alone the same device. I just think it can be a problem down the road for a non knowledgeable home owner.(Some homeoner replaces the device down the road and think he has duplicated the wiring, but never broke the tab to split the device and .....wham).

Our requirements for handle ties at the panels , and even tieing the feeds together as the enter the panel, are inexpensive and good code.

We got some really excellent sparkies and electrical men who will I'm sure correct me or confirm code for ya.

Best ...

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Old 05-29-2013, 12:19 PM   #3
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Dishwasher and Disposal Wiring


The dishwasher and disposal each have their own 20A breaker that are tied together. I assume due to their close proximity that they ran a single 12/3 line instead of two 12/2 lines. Red wire powers dishwasher and black wire powers disposal.
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Old 05-29-2013, 12:27 PM   #4
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It sounds as if you are attempting to run two separate lines into one box? If that's the case then just run new lines to separate boxes. That would seem best if all you are trying to do is move an outlet.
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Old 05-29-2013, 12:31 PM   #5
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Yes you can relocate the 12/3 to another box. Cut the brass jumper, leave the neutral jumper in place and install on a 2 pole breaker.
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Old 05-29-2013, 12:35 PM   #6
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Originally Posted by gpraceman View Post
The dishwasher and disposal each have their own 20A breaker that are tied together. I assume due to their close proximity that they ran a single 12/3 line instead of two 12/2 lines. Red wire powers dishwasher and black wire powers disposal.
Yep....99.99999999% chance you are dead right. And that would be good smart economic wiring.

Do you understand MWBC (multi wire branch circuts).... ya probably do...just checking.


EDIT...Thanks Electures... OP... I guess that is code compliant which I thought... but I personally still don't like it from shearly a belief that MWBC confuse a lot of DIY.

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Old 05-29-2013, 12:37 PM   #7
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Originally Posted by nicktools561 View Post
It sounds as if you are attempting to run two separate lines into one box? If that's the case then just run new lines to separate boxes. That would seem best if all you are trying to do is move an outlet.
No, it is a single 12/3 line that happens to power the dishwasher and disposer. It runs into the old dishwasher box and then a short 12/2 line runs to the disposer box.
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Old 05-29-2013, 12:47 PM   #8
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GPRICE.... don't know what it looks like under your sink base.... but would not it be almost easier to drop in a remodel box.... then trying to fish into and stuff an existing box????
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Old 05-29-2013, 01:01 PM   #9
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GPRICE.... don't know what it looks like under your sink base.... but would not it be almost easier to drop in a remodel box.... then trying to fish into and stuff an existing box????
Not really. I just cut an access hole in the drywall below the box so I could drill the hole in the sole plate for the line to come in. That hole gave me easy access to feed the line into the existing disposer box. I'm not too worried about making a bunch of holes in the drywall, since they will be covered up by cabinets.

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Yes you can relocate the 12/3 to another box. Cut the brass jumper, leave the neutral jumper in place and install on a 2 pole breaker.
Thanks for the confirmation. I finished the task and did just that. The breakers are two single poles but they have a metal piece tying them together.
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Old 05-29-2013, 02:22 PM   #10
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Thanks for the confirmation. I finished the task and did just that. The breakers are two single poles but they have a metal piece tying them together.
The metal piece has to be listed for the application.
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Old 05-29-2013, 02:34 PM   #11
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The metal piece has to be listed for the application.
Attached is a photo of the main panel showing the metal clip across the two breakers. The builder did the same setup with the fridge and one of the small appliance circuits.
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Old 05-29-2013, 02:49 PM   #12
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That hole gave me easy access to feed the line into the existing disposer box. I'm not too worried about making a bunch of holes in the drywall, since they will be covered up by cabinets.
I hope that means you are not concerned about having a bunch of patches, rather than you don't plan on patching holes.
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Old 05-29-2013, 02:53 PM   #13
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I hope that means you are not concerned about having a bunch of patches, rather than you don't plan on patching holes.
I'm not worried about having a bunch of patches.

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