Wow!, This job really has got everything!. Is there a bushing on that pipe where the cables head down through the cieling tile?. Is it my eye-sight or is that some osort of a dodgy set-up on top of the troffer in the 3rd pic?. John, I've never liked the idea of cords being fed through suspended cieling grids, I've seen a few of them energised in my time. They don't lend themselves to good grounding/bonding in any case.