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Running a neutral wire to a switch box

Home Improvement Asked on October 4, 2021

I live in Ontario, Canada. My place was wired pre 2011 code, so it doesn’t have a neutral in (most of?) the switch boxes. I would think that the easiest way to fix this is to run a neutral line from the light to the box. My question is, is this to code?

Edit

I’ve used an endoscope, and I can see that all of the wires are separate within the conduit.

2 Answers

If your wiring is in conduit, and there is room in the conduit for another wire, then you can pull another wire into the switch box for a neutral.

You would go back to the box of the fixture the switch controls in which there is a paired hot and neutral and pull a neutral from there into the switch box. Personally, I have never worked with conduit so I can't say what are the practical difficulties in doing this, but I cannot imagine that this would be disallowed by code.

I imagine one way to do this might be to use the existing switched hot wire to pull two wires from the fixture box into the switch box, one would be the neutral and the other would be a replacement for the wire you are using to pull.

Correct answer by Jim Stewart on October 4, 2021

Yes, you need to follow (in the conduit) the same hot and switched-hot wires. Follow the switched-hot to the lamp itself; there, a neutral must be present. Tap the neutral from there.

Do not tap the neutral from any convenient location. Only the other end of the switched-hot wire.

Answered by Harper - Reinstate Monica on October 4, 2021

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