A discussion at work involves running TC-ER tray cable through a Div 1 area and whether it is allowed. there is no termination within the Div 1 area, just that it intrudes on the cable tray. I know at that point it definitely needed to MC-HL. I've been trying to find code justification for doing so, but have not located anything yet. I had thought because it has a vapor-tight jacket, that it was allowed. any clarification would be greatly appreciated.