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?.
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.
Let's face it, these days if you're not young, you're old - Red Green