Not sure what system you ask about.
We have 2 systems in Norway today:
1)A 230/400 V system equal to UK systems.
2)A 230/230 V system where single phase loads are between 2 legs of the 230V 3 phase system. This may or may not have a grounded center of the Y (IT or TT) no Neutral wire at all.
As far as I know this was banned in the UK from 1948.
IMO 230 volts TN should be used in all domestic and light commercial, its much safer and no broken neutral to worry.
Ive always wondered, why was IT chosen over TN? Surely grounding the neutral would have been better?
