Re: barbara.hudson
" if she'd declined to work on it..."
Maybe, maybe not. But it's entirely irrelevant - you can always get some other job sooner or later, but nobody ever got a second life. Sure you don't know beforehand this is the time it's about to happen to you, but it doesn't matter - whatever the probability of an accident is, with some things, it's too much. You don't service heavy machinery that's still powered, work on high voltage stuff* "expecting" it's off, and so on. You just don't.
*If you ARE working on live high voltage stuff knowingly, hey, I'm not judging, but I have to tell you son you've made some questionable choices in your life...