The (old) 230V IT system apart, the modern TN system (European standard 230/400V) will not differ much from the rest of Europe.
Sockets: Schuko, standard
Boxes: 60 mm, round continental standard
Cables: Sizes and colours, same as found in all of Europe today.
Cable types: Unique to Norway, not that they differ much from those of any other country.
MCB's: Standard type, found in all of Europe.
[This message has been edited by C-H (edited 04-12-2006).]