Pauluk,
Quote

As a matter of interest, what are the Norwegian terms for line, neutral, etc.?

Here you go:

Voltage = Spenning
Current = Strøm
Power = Effekt

Phase = Fase
Neutral = Null
Earth = Jord
Protective Earth = Beskyttelsesjord

Conductor = Ledning
Circuit = Kurs
Grid = Nett
System/installation = Anlegg

Fuse = Sikring
Fuse box = Sikringsskap
Main fuse = Hovedsikring
Main disconnect = Hovedbryter
RCD = Jordfeilbryter

Junction box = Koblingsboks
Socket = Stikkontakt
Light switch = Lysbryter

Blackout = Strømutkobling
Electrician = Elektriker

Disclaimer: There could be errors in the above list.