ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Norwegian power?

690 are not a used standard here, but more a special ting.
230V IT ,TT , TNC-S are used.
400V are usually TNC-S not IT.
Private transformers are usually small for single units using e.g. 400V when 230 are supplied or vica verca. Atotransformers are banned.

Trams/subways runs on 750V DC Train on approx 16-20kV 16-2/3Hz

dsk