ECN Forum Forums General Topics of the Trade General Discussion Area cold room wiring method

Class1 Div 2 requires threaded IMC or RMC, no EMT.

You could put lag shields into the concrete and use conduit hangers on 4 1/2" or 5" hanger bolts ("wood screw thread on one end, machine thread on the other)with a jam nut on the machine thread at the surface of the foam and another nut securing the hanger.