Hi, I\\\'ve got a channel that\\\'s about 12mm deep, and a cable to a light switch which is 4mm deep. If I put oval conduit in, I reckon I\\\'ll have to chisel into the brick work to leave enough depth for a decent layer of plaster. Is this what needs to be done, or can you get away with plastering directly on to the cable? Any thoughts / comments appreciated. Cheers, Fitz.