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Thread: Bonding when 2 circuits in one box?

  1. #1
    DIY Senior Member jch's Avatar
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    Question Bonding when 2 circuits in one box?

    I have a wall switch box that will have 2 circuits in it:

    1) A pass-through circuit with just a junction between incoming and outgoing wires; and

    2) A light switch at the tail end of a separate circuit.

    I have attached Circuit #2's bonding wire to the box because it is the circuit that is powering the switch.

    Questions:

    a) Do I need to also attach Circuit #1's bonding wire to the box? Circuit #1 is just passing through the box (with a junction inside the box).

    b) Do I need to make sure that both circuits are on the same phase? Or is it okay for them to be opposite phases?

    Thanks,
    ----------
    - John

  2. #2
    DIY Senior Member dlarrivee's Avatar
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    Everything in the box has to be tied together and tied into the box, afaik.

  3. #3
    Test, Don't Guess! cacher_chick's Avatar
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    I cannot answer the question with certainty, but I do look forward to further explanation if that is true.

    IMO, if the box is bonded, (which it is required to be if it is metal), I don't see any benefit to attaching the other conductor only because it passes through the box. This would only create another splice, which again, IMO is unnecessary.
    Last edited by cacher_chick; 03-29-2011 at 06:46 PM.

  4. #4
    Electrical Contractor/Instructor jwelectric's Avatar
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    All equipment grounding conductors that enter the box are to be tied together with the largest being bonded to the box.

  5. #5
    DIY Senior Member dlarrivee's Avatar
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    Quote Originally Posted by cacher_chick View Post
    I cannot answer the question with certainty, but I do look forward to further explanation if that is true.

    IMO, if the box is bonded, (which it is required to be if it is metal), I don't see any benefit to attaching the other bonding conductor only because it passes through the box. This would only create another splice, which again, IMO is unnecessary.
    It's a redundancy thing though...

  6. #6
    DIY Senior Member jch's Avatar
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    What I'm doing is moving the light switch on to a different circuit and preserving the original circuit's connections to the downstream outlet(s).

    It's a plastic box (if that matters).
    ----------
    - John

  7. #7
    DIYer, not in the trades LLigetfa's Avatar
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    It sounds like you might be exceeding the maximum number of conductors in the box. What size box and how many conductors?

  8. #8
    Electrical Contractor/Instructor jwelectric's Avatar
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    Quote Originally Posted by jch View Post
    What I'm doing is moving the light switch on to a different circuit and preserving the original circuit's connections to the downstream outlet(s).

    It's a plastic box (if that matters).
    there is no need to bond a nonmetallic box

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