Do you have a residual current device (RCD) installed? If not, I highly recommend getting a simple plug-in unit like
https://www.biltema.fi/rakentaminen/sahkoasennustarvikkeet/vikavirtakytkimet-ja-vikavirtasuojat/vikavirtakytkin-2000030602 . This will catch most deadly faults and has been mandated in new electrical installations in bathrooms for quite some time and is a good voluntary add-on in older installations.
There exists no thing called "electric ground". In old installations, PE (protective earth; yellow-green; the two exposed contacts in the socket) is usually tied to the plumbing with low resistance. But if you use plastic pipe for example, not every faucet is earthed, obviously. Neither the piping nor PE should carry much current. There can be a significant voltage difference between N and PE, though, because they are tied together further away, but N carries current, hence voltage drop on N wire, but not PE wire. Both N (neutral) and L (li
ne) are called LI
VE wires and considered equally dangerous. Try to avoid home-brew/lazy terms like "ground" or "earth" because they are common sources of confusion and danger.