George Little ---
Tightness does matter ...
I expect you are commenting on 3 NM cables going through a 1" hole.
I expect you allow the same 3 MN cables to be run through a 10"x14" joist bay.
Will you allow 3 NM cables though a 4" hole? A 3" hole? A 2" hole?
When the code contains a section that states a specific spacing for cables, I will change my position as to what the code allows. Until then anyone who requires derating because cables pass through the same hole is simply wrong.
