Seems , he felt that is was OK to switch the live or Neutral side , that is was an arbitrary choice which side was switched.
But I'm not sure I've conveyed the full horror :
1: He had rubber gloves on
2: Used an SDS drill to put holes in concrete ceiling
3: Grabbed hold of the bare wires...
Just moved into a new rented flat in Zurich and as is common most of the light fittings have been removed (?!) [previous renter was British] I bought a contactless tester, to check out wiring. We've since had a local sparks check things and fit some new lights, but I was surprised by what I...