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  1. #1
    Join Date
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    Default Thanks for the note.

    Number 11, 15 amp labelled lights. Other two, 15 amps labelled bedrooms. Can you think of any legitimate reason for these to be connected together?



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  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    Default Re: Thanks for the note.

    Depends on how the breakers are connected together (what 'connected together' actually means).

    The high wattage tankless water heaters have three circuits and all three breakers need to be turned off to remove all power to all of the elements.

    However, not okay if a large high amperage device is fed with large conductors and the large conductors are split (strands unwound and run to different breakers) - that is a definite no-no).

    When you looked inside the panel, what did you see as to how they were connected together?

    Jerry Peck, Construction / Litigation Consultant
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  3. #3
    Join Date
    Nov 2009
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    Default Re: Thanks for the note.

    They weren't connected together inside the panel. As I stated, all three breakers were 15 amp, one labelled for a lighting circuit and two labelled for bedroom circuits. Apparently the three circuits are somehow spliced together somewhere in the home.

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  4. #4
    Join Date
    Mar 2007
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    Default Re: Thanks for the note.

    Ken,

    My guess as to what the cause was is this: two of those were on a multiwire branch-circuit, someone not aware of what a multiwire branch circuit (MWBC) is, does, or how it is wired, connected one leg of the MWBC to another leg of some other circuit, resulting in shared and possibly crossed neutrals somewhere which now keeps power on until all three breakers are turned off.

    The worst (excepting electrical shock to the unsuspecting) thing is that one or both of the neutrals may now be carrying twice the current it was intended to carry.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  5. #5
    Mbrooke's Avatar
    Mbrooke Guest

    Default Re: Thanks for the note.

    Someone wire nutted all the hots or neutrals in a box somewhere would be my guess.


  6. #6
    Join Date
    Dec 2009
    Location
    Florida
    Posts
    552

    Default Re: Thanks for the note.

    Quote Originally Posted by Ken Rowe View Post
    Number 11, 15 amp labelled lights. Other two, 15 amps labelled bedrooms. Can you think of any legitimate reason for these to be connected together?
    Can't, especially since there are three, not two circuits involved. Two I could see if they did not understand basic wiring practices. Weird.

    Definitely time for the phrase (or equivalent) "have an electrician evaluate the service panel and the house wiring"


  7. #7
    Join Date
    Mar 2010
    Location
    conyers, ga
    Posts
    75

    Default Re: Thanks for the note.

    could be different circuit wired into same box/enclousure somewhere ?
    light switch, outlet ect on different circuits in same box/junction, other ?


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