Has anyone had any experience embedding a cable / conduit / raceway in a solid plaster wall (its solid plaster on masory - no lathe, no gap between the plaster and the brick on the other side)? I'm thinking I'll have to cut a channel in the wall and put in a piece of conduit to use as a raceway for NM cable, then plaster over the channel. I could also go with a true conduit system and use THHN cable, but I'd like to avoid that. I was hoping to use the Carlon NonMetallic Tubing (the corrugated blue stuff), but am a little unsure of its code-worthiness for such an install. Has anyone tackled a project like this... any pitfalls to look out for? I appreciate any advice.