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Wiring a Dishwasher rough-in

DoRight | Posted in Construction Techniques on October 2, 2016 07:00am

It seems most people have dishwashers hardwired and do not have plugs to plug into an outlet.  So how to you rough the wire in and how to you get a good looking finish if the romex just comes out throught he drywall?

Do teh drywallers just slop a bunch a mud around the wire or is there a bushing on teh romex or is there some kind of a box for this proposes?

Do people ever use a outlet box and fit it with one of those nipples typically use to attach metal shealthed wires too?

I have never seen this done.  The house I grow up in had an outlet and a plug.  I replaced my currect DW some 15 or more years ago and don’t remember what I saw there and I am not going to pull the dw out (long long story as to why that would be nearly impposible … think retro wood floor install after dw installed some 30 years ago … pida)

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Replies

  1. User avater
    Mike_Mahan | Oct 02, 2016 08:10pm | #1

    Just put a cord on it.

    You can just buy a cord an put it on the dishwasher. I do this all the time. It gives you a positive disconnect, too. A word of caution. If your outlet has one half switched for a disposer, beware of angled plugs on your cords or you may not be able to plug the things into the right half of the outlet. 

    1. DoRight | Oct 02, 2016 08:32pm | #2

      details?

      So you put the box under teh sink?

      You say disposer and dishwasher in the same box, is this a straight shared 20 amp circuit or do you use a double pole breaker (12/3 romex and split receptacle).  I did not think you should have a disposer and DW on the same circuit.  I would share a disposer and a hot water dispenser on one circuit as you are very unlikely to be disposing and making tea simutaneously.

      1. User avater
        Mike_Mahan | Oct 03, 2016 10:35am | #10

        DW and disposer.

        The dishwasher and disposer should not be on the same circuit these-a-days. In old work they often are. With a double pole breaker they are on different circuits even if they share a neutral. These-a-days a plug in air switch is often easier than a hardwired switch to install and locate.

  2. oops | Oct 02, 2016 10:35pm | #3

    If I understrand what you are saying, simiply install a remodle box where the romex is located, then either make the hardwire connection in the outlet box or install a duplex outlet in the box and plug the DW into it.

    1. DoRight | Oct 03, 2016 02:18am | #4

      why is this so difficult

      Have you ever wired a DW?.

      You say hardwire in a remodle box.  That is odd.  I know enough to know that if you "hardwire" a DW it means you have no plug and you "hardwire" the romex inside a junction box built into teh DW.  Teh question is where does the romex come from?  How does the romex come through the wall?  Is teh romex just pulled through the wall and you have some rough ugly holel with romex coming through?  But ok you suggest "hardwiring" inside the DW and "hardwiring" iside a remodel box in teh wall?  That would be pretty silly.  But ok I will bite.  How do you cover said remodel box with romex just sticking out running to the DW junction box?  You are suggesting having a remodel box with no cover just some wire nuts in there?  why have a box at all in that case?

      This is pretty simple.  How do you have a clean install when hardwiring?  A) you don't , you just have a hole in teh wall with romex coming out.  or B) you have some kindo bushing in the drywall with romex coming through.  If so WHAT!!!!!  C) you have some outlet box with a cover, if so WHAT COVER!!!!!

      Anyone done this before or seen one done.

      Thank  you to the poster suggesting the outlet under the sink.  That is an option, but would like to know how hardwiring is done.

      Thank

  3. tinkv192 | Oct 03, 2016 06:22am | #5

    Add box

    Get an (Old) work box from Home Depot. Scribe around the box with a marker in the same location where the Romex wire comes through the wall. Check the wire with a pen tester to make sure power is off. Cut out Sheetrock and install new box. Get a good outlet and wire black to copper, white to silver and ground to green. Add a cover plate. The dishwasher should of come with a plug attachment. Access the junction box at the dishwasher and attach black to black, white to white and ground to ground, secure with wirenuts and close up the box, now you have a plug in ready dishwasher.

    1. DanH | Oct 03, 2016 07:45am | #6

      RTFM.  The DW install manual will show locations in the opening where pipes and wiring can be brought through.  Run the wire through a hole in one of the idenitfied areas, leaving it long enough (per the instructions) for it to connect to the connection box built in to the DW.  You don't need a box.  You would only need a gasket if the wire runs through, eg, some sort of metal with sharp edges.

      If the cable's already installed and too short, surface mount a box in one of the "safe" locations and run the cable in and pigtail out.  Don't use a conduit box but one designed for romex, so you don't need bushings.

      1. DoRight | Oct 03, 2016 10:15am | #8

        Thanks Dan

        By the way this is new construction.

        So are you saying "I don't need a box" there fore the romex just comes there teh drywall with just a hacked in hole in the wall?  If that is the way it is done, then that is teh way it is done.  I just figure people would like a clean job.  I suppose if you wan ta clean job then you have the option of the outlet.

        obviously, since DW do not come with plugs, most are hardwired so there has to be a standard method of running the wire through the wall (cleanly or not so cleanly).  Never seen it done.  All house I go in alreay have the DW in place.... kind of hard to look.

        Thanks again.

        1. User avater
          Mike_Mahan | Oct 03, 2016 10:40am | #11

          Box in the wall.

          Mount a box in the wall flush. Preferably under the sink and not behind the DW. Use a blank metal coverplate with a 1/2" knock out. Attach the dishwasher with metalic sheathed cable or flex conduit, not romex, and an angle connector so that the cable or conduit stays flat against the wall. 

      2. tinkv192 | Oct 03, 2016 11:40am | #14

        I installed 125 dishwashers at the University this summer. Sure you could hard wire it in, or you can you an outlet. Either is fine. If you work on them I prefer to have the plugged outlet under the sink rather than finding a breaker or working on a board hot. Either way is fine. It's not that complicated 

      3. DanH | Oct 03, 2016 03:32pm | #17

        (No subject)

        View Image

    2. DoRight | Oct 03, 2016 10:10am | #7

      Thanks but I thought I was clear, apparantly not, I wish to understand how people wire a DW WITHOUT A PLUG.  no Plug anywhere, ... no plug at all .... hardwire.  how do you hardwire a DW.  I know how to wire the romex to the DW junction box.  HOW DOES TEH ROMEX EXIT TEH WALLLLLLLLLLLLLLLLLLLLLLLLLLLL.?  Again, does it just come out of some ugly gash in the drywall, is there a transition thingy in the drywall, is there a box with a special cover?????????????????????

      1. tinkv192 | Oct 03, 2016 11:49am | #15

        Hey

        I get what your saying but if your hardwiring it, There is no need for a junction box at the wall unless you have a splice, in your case the wire just needs to come through the wall underneath the dishwasher to the electrical housing of the dishwasher. I wouldn't run it under the sink (Romex) it will be hidden where no one can see it behind the dishwasher. 

        1. DoRight | Oct 07, 2016 07:03pm | #19

          Form of disconnect????

          I read somewhere that some form of disconnect is required for the DW if you hardwire teh DW.  .... eitehr a lockout breaker or a disconnect at teh device.  IS this true.  Anyone know for sure?

          I think I am leaning to installing a plug on teh DW and an outlet under the sink.  Covers all teh bases... i guess and only cost a leght of cord and plug and twenty minutes....

  4. cussnu2 | Oct 03, 2016 10:17am | #9

    Are you in the habit of taking the cover plate off the dishwasher and staring lovingly at the wiring?  Who gives a flip how the wiring comes through the wall....except a select few anal retentative people with apparently aggressive tendencies.  Seal it with drywall mud, caulk it, who realy cares.....unless, of course, you are an engineer, in which case there is no pleasing you since you already know the right answer to everything.

    1. DoRight | Oct 03, 2016 10:59am | #12

      so are you ..

      so are you an angry sort?  So if you stop being an AZ, and spare teh commentary, the question is : Is that how it is done?  Your opinnion aside.  Or do you even know how anything is done?

    2. DoRight | Oct 03, 2016 11:07am | #13

      Why

      No pleasing me?  I know everything?  I am asking a simple question, which you are obviously were originally incapable of reading untill I explained it again in first grade english and repeated it six times.  Some people are like that.  If I am asking a question, then obviously I don't think I know everything?  What an idiot.  Try a remedial reading class.

      All that said, I understand you like hack work and are happy with that.  I guess that says all you need to say.  your advice to me is to hack it up.  And again, if that is how it is done, so be it.  Your answer gives no evidence that you actually do any of this work and no evidence that you are not just a visiter here who likes to be an horse's and to read his none sense in print.

      1. cussnu2 | Oct 03, 2016 03:47pm | #18

        What engineering school did you go to?

      2. gfretwell | Oct 12, 2016 01:30am | #20

        I would fail romex poking out the wall and going to a DW or a disposal.

        Type NM is not legal for a whip. Typically these things get cord and plug connected these days.

        1. DoRight | Oct 15, 2016 03:16pm | #21

          Good to know.  Thanks.

        2. DanH | Oct 15, 2016 04:31pm | #22

          Why would you fail romex going to a dishwasher, and solely contained in the DW "niche"?  It's inaccessible when the DW is installed and the cover is on, and is terminated in the terminal box provided on the DW.  In this sense it's no different from a range hood or light fixture.

          I can see the issue with a disposal, as the unit is inevitably in an accessible space (and needs the disconnect anyway, for practical reasons).

  5. oops | Oct 03, 2016 02:15pm | #16

    Sorry, I did not know that this was new construction.  Hard wire to me means, no receptical, switch or other device. between the breaker and the equipment.  To me, if any connections are made up with wire nuts, in a J box etc. then it is hard wired.  When I'm doing an electrical plan, I as others have suggested, call for a J box or outet under the sink.  Just good practice.  Can make life much simpler down the road for service or replacement.

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