Dealing with past code violations that passed inspection?

[Llortus]

Looks like you possibly have a working space issue with tray below

I agree it likely protrudes 6-10 inches in front of panels. I found reference to 2023 NEC 110.26(3) Height of working space. I was not able to find similar reference in the 1987 NEC. So you are correct and thanks for identifying. I believe it was legal when installed.

It is very convenient to have a shelf to hold spare breakers (under an inch of dust).

Did you have an opinion on correct way to handle abandoned wires?

 

[ramsy]

See new thread "Where more than one ampacity applies"

According to Jim Dollard, 2020 310.14(A)(2) Exception only works with ambient corrections, not CCC adjustments in conduit > 24 in., per 2020 310.15(C)(1)(b).

 

[Strathead]

As an old person, I remember when we used to stuff as many current carrying conductors as we could fit in a conduit. In Oakland Ca they didn't start enforcing this until the early 90's. It was code prior to that though.