I have experienced some shocks from ground loops, where the shock was only perceptible when the current density was small enough. If I placed my whole palm on the conductor, I couldn't feel it, but if I placed just my finger tip on the edge, I could.
That was an electrical shock that in my naive opinion does not pose a cardiac risk.
I imagine that there is some judgement call to make about what is "electrical shock", and when does it pose a cardiac risk.
If all is going well, shocks are rare, and so I could imagine as a rule "if you felt a shock, go to the doctor". But in some [yes, of course, unfortunate, avoidable, and unacceptable] contexts, a rule like that might not be followed. That is why I was wondering about what guidance electrician's unions provide.
Your heart muscle is controlled by a tiny voltage. Suddenly forcing it to follow 50/60Hz of a huge voltage isn't precisely natural, and something that can leave lasting damage even if your heart seems to work just fine immidiately after.
There is a reason in electrics a lot is done just to prevent electrical shocks (e.g. RCDs), because you know: it kills people.
I am legally allowed to connect houses to the electrical grid in Germany.