Dishwasher/disposal wiring

Discussion in 'Electrical Forum discussion & Blog' started by JMingrone, Nov 26, 2012.

  1. JMingrone

    JMingrone New Member

    Joined:
    Aug 21, 2006
    Location:
    Connecticut
    Do a disposal and DW HAVE to be on separate circuits? I have 2 circuits allocated for them, but one has plenty of capacity to run both. Can I simplify and run both off the one?

    Also, Can the NM cable just come thru a hole in the sheetrock into the area where the sinkbase will be and after the sinkbase is installed, put a JB inside?

    Thanks

    -Jay
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Depends...if the installation instructions call for separate circuits, you should use separate circuits. Disposers are available in at least up to 1Hp versions, which along with a DW that was heating the water, might overload the circuit. So, to preserve long-term potential changes and options, an extra circuit won't hurt.
     
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    In some cases, if not MANY, since the disposer, (NOT "Disposal"), switch is combined with other switchs or outlets above the countertop level, it is wired into that circuit and the dishwasher is separate, even though the disposer and dishwasher share the same duplex outlet.
     
  5. JMingrone

    JMingrone New Member

    Joined:
    Aug 21, 2006
    Location:
    Connecticut
    Went ahead and ran both wires. Easy enough to do.

    Thanks guys,

    Jay
     
  6. big2bird

    big2bird IBEW Electrician

    Joined:
    Sep 29, 2012
    Occupation:
    IBEW Electrician
    Location:
    Anaheim, Ca.
    I would run a 14/3 cable, feed it from a 2 pole 15 ampere breaker, and cut the tab between the upper/lower receptacle on the hot side.
     
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