Adding an opinion here. I thought it was clear, at least from Square D, that the hole is intended (can we assume investigated?) for use by a GEC. It is trade practice to use it as such. I've done it, and seen it done for a pretty good while now.
Has anyone ever had a problem with this? With all the eyes and ears out there, can we come up with a picture of one damaged? An accident report? I've never seen arcing evidence, and I've done a lot of fire jobs, anyone else?
Unless someone offers evidence to the contrary, as an inspector, I would allow the practice.
