We are building a semi-automated machine for the pharmaceutical industry. It has a structural welded frame 2"x2" members, 304SS. Is it ok to route wires through the frame? One of the guys here wants to do it, and I cannot find anything forbidding it in NFPA 79 Electrical Standard for Industrial Machinery. Still, it just seems wrong and extra work for nothing much, just a cosmetic gain this guy is after. What do YOU think?