We have a machine built in a frame with two control panels on the outside of the frame. The frame is 3x3 square steel tubing and the cabinets are standard NEMA 4x painted steel, 12gauge. The main panel is powered by 24VDC 40A from a remote source. The second one is houses pneumatic valves actuated from the first panel. No power bus is present in it. A fellow engineer said, "Well, we want to use that (second panel) as a place to step when you clime up the frame." Are there any safety or legal code restrictions to say that can't be done?