I just did some very unrewarding looking in the white book. The NEC to U/L cross reference for 250.146(A) sends you to QCIT on page 257.
With titillating glee I flipped to that page expecting a definitive answer to this conundrum but, alas, it don't say squat about grounding devices in the cover.
I then followed the reference to ANSI/UL 514D in google and got less than squat. The scope of this standard and the dozen standards referenced by this standard don't seem to address this grounding issue either.

At this point, if I was inspecting I would scrounge around on the floor, find some wire and put the jumper on myself. It wouldn't be worth arguing about it anymore wink

Realistically I am not sure how I would know it wasn't there anyway unless I opened the box. I suppose this happens when the question comes up in the office and somebody takes the time to look.

We are really left, at this point at what is an acceptable thread locking device. Is that just a lock nut? (you need 2)
If John had a box of these

[Linked Image from gfretwell.com]

we wouldn't have spent 2 days on this. wink

Greg Fretwell