There is nothing I need to know in a crisis. I do know that locating a main not taller than I am is legal and I was somewhat looking for something to do when I posted the uffer question as well as double checking. I was curious as I remembered it was some odd numbered dimesnsion.
Most of it doesn't change, only a handful of things and on occasion the location in the book. Most people don't re read the book, they look it up after being notified on changes. I remember Aceman caught me on another forum when they went from 100 to 90 on the alum wire for panel to panel.
I read something on occasion if it interests me but my real code study days are well behind me. I havmt missed an entrance inspection in 30 years and the guy made me change something on a rough 20 ago and it was the first house I did in a while then.
The design looks like its sposed to, its got the right number of wires, the bond is correct, metal grounded, lugs tight, got the right ocpd and a couple ground rods. I leave a pile of old parts in the corner, have a box of staples, box connectors and some gfci laying there and at my age inspectors think I am an electrician and usually get a comment about the workmanship. I don't tell them any different unless they ask and I know a couple retired ones so the name game works. Well worn trade tools, professional battery tools probably add to the impression.
I don't hang out a sign, don't do it full time, stick with a few things for friends or jobs that others don't want to do. Turned down one the other day that was such a mess and didn't really have the time anyway, I should have snapped a pic of this dandy.
If I was 25 and going in would get a new book but will likely never buy a new one.