Installing Garbage Disposer electrical

Discussion in 'Electrical Forum discussion & Blog' started by SaShepherd, Jun 18, 2014.

  1. SaShepherd

    SaShepherd New Member

    Messages:
    6
    Location:
    British Columbia
    I need to run power to a new garbage disposer and am looking for advice. My dishwasher is on it's own 20 A breaker. I thought to junction the power off before the dishwasher and branch off a line to wire a half switched outlet for the disposer. The half hot outlet would be for future potential use for an instant hot water device. I would leave the dishwasher hardwired. Is this the best was to do this?
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,689
    Location:
    Cave Creek, Arizona
    HEre, the dishwasher has a pigtail and it goes into the "hot" half and disposer uses the switched half.
  3. SaShepherd

    SaShepherd New Member

    Messages:
    6
    Location:
    British Columbia
    Yes, this could also be an option for me, however, I'd like to have the hot plug available for an instant hot water unit.

    Does anyone see a problem with my suggested plan for running power to the disposer?
  4. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,534
    Location:
    North Carolina
    Someone once asked me how many dimes were in a dollar. I now ask how many amps are there in a 20 amp circuit.

    I suppose one could hook as many things to a 20 amp circuit as they wanted but the reality is that the breaker will keep tripping
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,689
    Location:
    Cave Creek, Arizona
    Is that like asking "how many stamps are in a dozen"? You have no control over WHEN the heater is going to turn on, and if you use the DW and/or the disposer at that time it may overload the breaker.
  6. dj2

    dj2 Member

    Messages:
    418
    Location:
    California
    Better to have the garbage disposer on a dedicated circuit. Just to make sure, read the manufacturer's manual for the specific requirement.
  7. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,055
    Location:
    New England
    Some disposals have a pretty significant motor which, combined with a DW in pre-heat or drying mode, could easily overload a breaker.
  8. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,689
    Location:
    Cave Creek, Arizona
    I would put the disposer and DW on the same circuit, which is VERY commonly done, than the water heater and DW. The water heater is going to have a MUCH higher amp load than the disposer, ANY disposer.
  9. SaShepherd

    SaShepherd New Member

    Messages:
    6
    Location:
    British Columbia
    Thank you, everyone, for your replies.
  10. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,055
    Location:
    New England
    TO clarify...I was talking about the DW's preheat function on many of them if the incoming water is not hot enough. It tends to use the same heating element as the drying cycle, and can be fairly high current; not a tank-type WH.
  11. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,689
    Location:
    Cave Creek, Arizona
    WE know what you were referring to, but he is referring to adding on an undersink "ultra-hot" water heater.
  12. Vegas_sparky

    Vegas_sparky Eat kitty

    Messages:
    258
    Location:
    LV,NV/ Nowhere,UT
    I'd give the DW, disposal, and insta-hot their own dedicated circuits. Typically people are done with the disposal before the DW runs, so by chance you may avoid any issues. I've never seen an insta-hot that was worth a darn that didn't require a dedicated circuit.
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