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Do exposed wires require conduit?

Posted by tomkell (My Page) on
Mon, Mar 15, 10 at 21:17

I would like to install a light switch in a utility area (i.e. exposed studs). Can I simply run an electrical wire to a switch box or is a conduit required since the insulated wire is exposed. (I was told the code requires conduit where the wires run down the surface of the concrete block wall.)

Follow-Up Postings:

RE: Do exposed wires require conduit?

As far as the NEC is concerned, NM cable is allowed to follow the building surface exposed as long as there's no chance of physical damage.

RE: Do exposed wires require conduit?

Your local government can pass codes that are stricter than national standards though.

RE: Do exposed wires require conduit?

Surface? That's news to me. You can follow along the top of rafters, the sides of studs, the bottoms of floor joists. But along a block wall you need conduit.

Easy way to find out - ask your inspector.

RE: Do exposed wires require conduit?

"But along a block wall you need conduit."

Must be a local requirement.

The most the NEC would require is a piece of 1x beside the cable.

Or you could pull NM into the core of the blocks.

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