We were building a pharmaceutical laboratory into the shell of a tilt up warehouse. We built trapeze racks to carry the conduit but we hung the rod off of the bottom cord of the trusses. The AHJ declined concealment until we transferred the load to the top cord of the trusses. I don't doubt that some code requires this but with the largest conduit being one inch and the trapeze being one foot wide I thought it a bit petty.
--
Tom H
