Around here in the Northern Cape there is still a lot of houses with TN-C systems. The neutral and earth are then combined in the meter box to provide an earth for the house. Sometimes the neutral is bridge in the DB outside the house, before the Earth Leakage.
The problem is that the Neutral from time comes loose due to bad connections or due to cable loss, the Earth wire then become alive because the load on the Neutral is looking for a path to the ground.
I think this is the main reason why the TN-C system is not being used anymore