Thanks C-H, that makes sense and applies for Austria as well. If you go into a 19th century apartment that has been lived in by an old lady/gentleman for the past decades you can be pretty sure the only Schuko sockets you can find (if there are any) are in the kitchen.
When we moved in, I found: Infrared room heater in the bathroom grounded to the water pipe, 2 Schuko sockets in the kitchen. One used to be grounded before some stupid plumber cut the ground wire next to the water pipe, the other one was never grounded at all. All other rooms only had ungrounded sockets. And that's the norm for buildings like that.
That style of grounding was called "Protective Earthing" (Schutzerdung), this term means local ground rod only, no RCD protection, only 10 or 16A fuse/breaker. Voltage operated ELCBs were barely ever used in domestic applications and GFIs didn't show up until the late 70ies.
BTW, the guy one floor above us doesn't have a single Schuko socket anywhere in his place. The last additions to his wiring were probably done just after the introduction of cables with the new color code (that means between 1967? and 1972), afterwards _nothing_ was done, maybe except for taping up some bare conductors that caused shorts.
