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rough-in dishwasher electric

cwc09 | Posted in Construction Techniques on July 30, 2009 07:30am

I am installing a dishwasher in my house which currently does not have electric in place for it. I know I should run a new dedicated circuit for it, but can I get away with adding it to an existing circuit if I have the capacity? There is a receptacle right near by. Getting back to the panel would be a task (no basement). I want to do it well but don’t have all the time in the world.

 

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  1. suomiconstruction | Jul 30, 2009 08:03pm | #1

    Don't know if it's code or not but my dishwasher has a cord wired in and then plugs into the wall.

    Probably not right but it works...

    Rafael

    1. Hiker | Jul 30, 2009 10:31pm | #3

      A grounded plug is required here and must be accessible. Same for disposal

      1. suomiconstruction | Jul 30, 2009 10:46pm | #4

        Hmmm....Haikola, you one of them Finns?

        1. Hiker | Jul 30, 2009 11:31pm | #6

          Mom and dad came over in 1959.  Lived in Sault St Marie  before moving to Brooklyn NY.

          Obviously by your tag line you are-First, Second, Third Gen??

          1. suomiconstruction | Jul 30, 2009 11:36pm | #8

            Well fourth but Grandpa went to Russia before the war....some free land in the woods thing. He made it back but his brother didn't.

            Dey's from Palmer which south of Marquette

            Mom's side is eyetalian from Bessemer which is near the WI border.

            All yoopinese..

          2. fingersandtoes | Jul 31, 2009 02:34am | #10

            Sault St Marie? Thought it was mainly Italians. Great hockey town. An architect I worked for holds the record for penalties with the Greyhounds. When he got drunk on his birthday he would get out a scrapbook with pictures of him biting an opposing player's ear.

          3. Hiker | Jul 31, 2009 02:10pm | #11

            We're talking fifty years ago and alot of Finns somewhere means there are at least five.

            Regards

            Bruce

          4. suomiconstruction | Jul 31, 2009 06:36pm | #12

            As a Finn, I gotta say.....

             

             

             

             

             

             

             

             

             

             

            you're right 5 is a lotta Finns.

      2. Righty_Tighty | Jul 30, 2009 10:46pm | #5

        Do you think "accessible" would include a receptacle behind the installed dishwasher?

        I have a friend who did that.

        1. Hiker | Jul 30, 2009 11:33pm | #7

          Around here accessible means the BI has be able to see it with twisting his neck too much._They like to see it in the sink base cabinet so it can be disconnected easily prior to any servicing.

  2. User avater
    lindenboy | Jul 30, 2009 08:49pm | #2

    Whether or not it is CODE, I don't know.  But in practice, you'll be fine.

    "It depends on the situation..."
  3. cap | Jul 31, 2009 12:30am | #9

    Generally, it needs to be on it's own 20A circuit, per the NEC.  But it depends on how much power the unit needs.  My dishwasher nameplate says 6 amps for the motor and 12 amps total.

    Depending on your inspectors interpretation of the Code, and the size of the garbage disposal motor, you can share the dishwasher circuit with a garbage disposal, because they are considered non-coincident loads.  If the nearby receptacle is for the garb disp and it's a dedicated 20 amp circuit, then that'll work.

    But if the nearby recept is a countertop receptacle, it's not a good idea.  The kitchen countertop plugs (small appliance receptacles) need to be on their own circuit(s), per the NEC, so pulling power from a countertop plug circuit is not allowed. 

    From a practical standpoint, if the heater and motor run at the same time (and I don't know if they do), then you're at 12 amps and that's near the upper limit for a 15 amp circuit.  If you wire the DW to the countertop plug circuit and have a toaster or similar appliance plugged in to that circuit and on, well, there goes the breaker.  If the countertop plug circuit is 20 amps, the breaker might not trip every time both appliances are on.

    Do the right thing.  Run a new 20 amp circuit. 

    And while you're at it, run 12-3 wg cable; no more effort, and then you'll have two, 20 amp circuits and can run the garbage disposal and dishwasher on one and have another for a hot water dispenser or whatever.   Or put the garburator and DW on separate circuits.

    As far as wiring in the dishwasher, you can hard wire it, or, if the dishwasher is adjacent to the sink,  use an appliance pigtail and plug it into a receptacle.  But put the receptacle outlet under the sink, not behind the dishwasher.  A hole through the partition allows you to feed the plug into the space under the sink. 

    Cliff

    1. LIVEONSAWDUST | Jul 31, 2009 06:58pm | #13

      Around here, you used to be able to hardwire it, but now they want it plugged in a receptacle under the sink or under the dishwasher so as to be able to quickly disconnect it for servicing.

      1. RobWes | Jul 31, 2009 07:07pm | #14

        Mines plugged into the receptacle under the kitchen sink right next to the hot water maker. Makes life so much easier than screwing around with 6 wires in a 2X2X2 inch box with sharp corners and me laying on my gut swearing at stupid people who design such nonsense

      2. Snort | Aug 01, 2009 02:21am | #15

        We can still hard wire, and I haven't seen one that wasn't... but a plug under the sink sounds like a much nicer way to go... I smell an upgrade<G>http://www.tvwsolar.com

        We'll have a kid

        Or maybe we'll rent one

        He's got to be straight

        We don't want a bent one

        He'll drink his baby brew

        From a big brass cup

        Someday he may be president

        If things loosen up

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