There was an illegal receptacle being fed by wires coming out of a vertical sealing fitting EY (not very sure) like 36" off the floor. But what catch my attention was that this fitting was treaded to the pipe coming from the floor and at the other end going to the ceiling, there were THHN wire (4 of them ) that are the feed for the lights, just on the air no raceway at all. This pipe and fitting are inside a square metal structure (12"X12"X 14 feet or so) My question is if it is possible to use this wire method inside close metal structures.