I'm curious about the application of 376.22.
My first question is how often is this enforced? I don't think I've seen it on a job.
Secondly, and more importantly, how would you go about applying 310.15(B)(2)(a)? Is 376.22 saying that if I have 30 current carrying conductors no problem but if I have 31 I must use 40% ampacity?
That seems a little crazy.
Do you start from the top of the table instead? Maybe 31-33 are @ 80% 34-36 @ 70% and so on? With the number of inspectors in this forum surely someone has enforced it.