You are absolutely right.
It will not be used in a new area, but are maintained where it is established. The supply to the house whre the pictures are from are changed to TT when the transformer was changed to supply 20 new buildings, they have 400V TN-C-S, so my guess are just tapping off at 230V for the older buildings.
The IT system made it self to TT at first fault :-)
At second fault, it might start a fire in the first fault location. When no fault the voltage was floating relative to ground, usually stabilized at approx 130V due to capacity to ground.
In Norway even TN-C-S systems have all pole circuit breakers, so even an overload in N will release the circuit.
P (ground) and N are not connected in more than one location in each house.
dsk
