I have a home workbench and do minor refurb work with old turntables and monitors (CRT) etc. That implies potential exposure to high voltages (mains or above) at power supply capacitors, etc. I have seen many recommend that having a 1:1 isolation transformer on the bench is a critical safety measure.
There are a few questions floating around about this here. I understand that by doing this you're no longer connecting to earth ground directly, but I'm perhaps less well educated on the principles of electrical engineering and trying to understand which specific "I touched this component, at this time" scenarios are improved by using the isolation transformer, and which ones are not.
It sounds like there's some sense that you could in theory poke at various components while the device is powered on and as long as you only touched in single places and didn't accidentally bridge circuits you would be safe, but this doesn't sound intuitive to me. I mean, I'm in danger normally of shocks towards ground even with shoes on, aren't I?
Does any of this matter if the device is powered off? (E.g. as a large cap discharges)
Links or other pointers welcome, of course. Thanks.