Does anyone know of a code or standard that applies to installing electrical wire & cable in a concrete trench? The trench was saw cut into a floor and the owner wants to just lay the cable and wire into the bottom of the cut-out and cover it with steel plate. There is some 480vac and 120 control power in there. I don't like it but don't see a code or standard to back up my opinion. I didn't see anything in NEC but sometimes that's like trying to find a needle in a haystack.
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