Bonding when 2 circuits in one box?

Discussion in 'Electrical Forum discussion & Blog' started by jch, Mar 29, 2011.

  1. jch

    jch New Member

    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,
  2. dlarrivee

    dlarrivee New Member

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    Everything in the box has to be tied together and tied into the box, afaik.
  3. cacher_chick

    cacher_chick Test, Don't Guess!

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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: Mar 29, 2011
  4. jwelectric

    jwelectric Electrical Contractor/Instructor

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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. dlarrivee

    dlarrivee New Member

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    It's a redundancy thing though...
  6. jch

    jch New Member

    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).
  7. LLigetfa

    LLigetfa DIYer, not in the trades

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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. jwelectric

    jwelectric Electrical Contractor/Instructor

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    Location:
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    there is no need to bond a nonmetallic box
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