Add Zinsco panels and breakers to the list of unsafe electrical equipment. Also screw in type fuses, not because they are fundamentally unsafe, but they can easily be replaced with the wrong fuse capacity, which in turn then makes it unsafe.
My house is from 1933 and the downstairs electrical system (the upstairs is an addition that wasn’t added till 1995 and it has a separate system) and it has screw in fuses. I don’t touch that stuff, I leave it to the electrician. I only just learned about the Federal Pacific thing like 20 minutes ago after I brought up having one of those panels on another subreddit, and was promptly informed to get rid of it
Our house had zinsco when we bought it. Inspector said it can cause electrical arcs
and those little fuse adapters people used to bypass tripped fuses are a whole other nightmare, basically defeating the protection entirely. wild how much unsafe legacy electrical is still out there in older houses