I had to cut four holes in the metal casing of the electrics and it worked. It only took four cuts and I used lots of cutting fluid and a drill press. It was humbling to use but I think I could cut a few more holes if needed. The metal box was YuCo Yc-20x20x8 IP65, 16 gauge, inside/outside wall standard case, 20" H x 20" W x 8" D.