Does anybody know where in the nec it states that emt cannot be used as a means to support other luminaires? Such as a short section of emt tubing spanning across roof trusses and then running your luminaire support up to and from that span of emt. I have done this before for rc cans in a dropped ceiling (short pieces of emt) and on commercial jobs for chain supported flourescents where the room layout does not fall on a structural member.I have never had any inspectors fail me for this but have questioned the method with no code article cited.This is my first post,so any help would be appreciated.