Very nice looking panels. I want to start takings pics of my work but the fella's at work all think I'm a bit off my rocker for wanting to do that. Whatever...

The one thing I don't understand is this, why do the conductors coming through the "donuts" (in pic #3) have to be derated? What article prohibits this? I looked at 310.15 (B)(2)(A).

By the way, very nice 'workmanlike' looking panels.