electrical engineer
First off, you shouldn't be messing with anything with the power on.
110v will kill you just as dead as 220v.
Anything above 60 volts is a lethal shock hazard, but even lower voltages can give a purdy-big spark. (SAE specifies anything above 60v in a car must be ORANGE)
electrician's joke: " I always keep one hand in my pocket when trouble-shooting circuits."
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