Wire laid in mortar-less brick joint ??

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Knuckle Dragger said:
(3) In a shallow chase in masonry, concrete, or adobe and
covered with plaster, adobe, or similar finish.

Where I come from, anyone who installs NM through concrete directly is called a hack. I'm not say you are. :D
I don't know of any inspector that would allow you to run a standard romex/ NM through concrete or masonry. It needs to be in a sleeve.
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That's the way I've always been convinced also.

I've piped into enough storm shelters and under suspended garage floors, and I've never taken a Romex through a hole in concrete unless it is sleeved

However the code citation provided doesn't technically apply to my scenario. As Golddigger pointed out, that would apply if they were simply going to smooth over the brick with plaster and then paint it.

I don't want to lay Romex in the joint and then have someone come and fill it with mortar to keep the Romex in place. That's why I thought I could possibly stuff foam backer rod in, or if I found a wire loom small enough

I guess it's just a struggle between conscience and technicality.

in some ways, this would be similar to the time I used an in-wall splice kit which does not have to be accessible. I hated it with every fiber of my being, but they are UL listed for that purpose. So I set my conscience aside just once
 
You are your own man and this is your job and you will do what you think is best.

Maybe the GC could grind out a trench large enough for a conduit sleeve or MC to fit into. He is covering it with a stone veneer anyway correct?

I typically drill into the firebox and sleeve and MC cable or conduit though it. Sometimes you can't because there is an adjacent chimney from another fireplace or furnace on the next floor below.

Good luck to you.
 
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