Here in Norway the common voltage are 230 at 50Hz single or 3-phase supplied from a delta wound transformer, that makes it without neutral. The line between the last house, and the transformer may sometimes be more than 1000 meters (=yds?) The older houses usually have small fuses, maybe only 25A single phase at 1000 sq feet.
A completely new system would have 230/400V with a neutral. (if the not connected to an old supply of 3*230V) Usually all houses has 3 phase (apartments: single phase) and the the system should be designed to be able to carry a load 10/6 of the calculated need.
This thread started with why 230V at 60 Hz, The chosen 50Hz in Norway today is based on what the neighbors use, but long time before we connected the countries together, 50 Hz was not flickering, but the lower frequency, the lower loss on long lines. Svalbard used 25Hz for a while, Halden used 40Hz, but thats all history.
I wonder about what the standard would have been if we started on today. What about 500V at 400hz in the local system and a DC high voltage grid?
