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TLDR: can a light switch box be used as a j-box to extend a lead for a different circuitry?

I am removing a long section of a wall (shown with blue outline) and I need to rehouse some of the wiring of a circuit. Right now I have a single lead coming from breaker box, through floor joists, into a 2-gang box (B) with light switches. Switch #1 powers under-the-cabinet lights, and switch #2 powers a kitchen fan. The same box also acts as a j-box for kitchen can light circuitry (actual switches for those are located elsewhere), and a range hood.

I am removing the under-the-cabinet lights, as well as the hood circuit, so I only need to power and switch the fan, and power the can light circuit. I will have a single switch (C) on the remaining section of that wall, but the lead is not long enough to reach it. The path from the breaker box for new wiring is a very difficult one so I'd rather not fish a new wire. But the existing lead can easily reach the 4-gang box (A) in a nearby wall/post.

Is it okay to use box A as a j-box to splice another run of 14/2 wire through ceiling joists to box C?

Thanks! enter image description here

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  • Can you post photos of the inside of box A, and also get us dimensions of the inside of the box? It's likely OK, but we'll need to double check to make sure we aren't overflowing box A here...also, why 10/2, by the way?
    – ThreePhaseEel
    Commented Sep 15, 2020 at 2:31
  • Why in heck are you using 10/2? do you have old aluminum wiring?
    – Ecnerwal
    Commented Sep 15, 2020 at 12:35
  • @threephaseeel thebox is quite deep. I actually wired it into a outlet box below that as it is an oversized box (they all are), and only had one 12/2 Romex coming into it. 10/2 was a typo, it’s actually 14/2.
    – David
    Commented Sep 15, 2020 at 15:17
  • @Ecnerwal it was a typo, sorry. I corrected it to say 14/2.
    – David
    Commented Sep 15, 2020 at 15:18
  • @David -- are you sure that 12/2 was on a 15A circuit?
    – ThreePhaseEel
    Commented Sep 15, 2020 at 23:22

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Yes, it's fine to repurpose a switch box just to house a splice.

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    ...if there is adequate volume in the box. Or you can replace the box with a bigger box if there is not adequate volume in the current box.
    – Ecnerwal
    Commented Sep 15, 2020 at 12:36

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