Definitly a difference.
Norway are following the EU in the way of this.
The main difference are the tradition of systems with
NO NEUTRAL This has implemented fuses in all wires, and when breaker became the rule, they are now sensing, and breaking all wires simultaneously, even neutral where those are. It is more and more focus on covers, and it shall not be possible to touch any wires or terminals without removing a cover (This makes even measuring a little more heavy, and you may often find missing covers to be replaced later by "lazy" workers".
You are not allowed to rewire your own home here, its extremely limited what you may do legally in your own house. It is common to have a main switch or breaker in all cabinets, something I have been missing in US homes.
Another difference may be the extremely long distances from the transformer to the consumer. On the countryside it may be several 1000 meters (~yds). This may cause considerable voltage drops, and instant water heaters are "unofficially banned".
dsk
Do they have a home supply center in Norway? What happens if someone re-wires their home without permission? I guess Im just really curios.
In America people can go to a 'Home Depot' or 'Lowes' and buy everything they need to rewire a home: electrical panel, wire, boxes, outlets, meter sockets, ect no questions asked. Sometimes in some areas a person should pull a permit and let the town know that is happening, but, being honest that usually doesn't happen. In America the average home owner can re-wire his entire home and not be punished.
In US home you are required to have a main disconnect either outside or the panel right after the meter. But sub panels are not required to have this disconnect. However, a detached structure from the home like a shed or garage must have a main disconnect or less than 6 breakers to turn off all the power to the structure.
How much is the average voltage drop? Does 230 volts drop to 210 volts? Also why the ban on instant water heaters?
One more question: In Norway, do all IT systems not interconnect the grounding systems of different structures? In that only 2 or 3 hots, no ground to a home?
In systems where ground/ earth wires (jord cable) do not interconnect all structures that can be a major fire risk?
(In one home phase "A" may ground to the case of a fridge. Ok, just a TT system now. But if phase "B" grounds in a home two from the same transformer in the electric heater and the grounding system of the 2 homes is not interconnected home one and home two will have ground grids of opposite potential. The 230 volt potential will make power flow across the earth creating voltage gradients and heating up the grounding system drying out the soil)
