Hi again!

I learn that in the UK 400V is considered too much for "common people" and therefore you are sockets in proximity of each other must be on the same phase, houses are single phase only and so on.

The US seem to have a similar attitude. This contrasts starkly with the view in some European countries where even the cheapest choco bloc is marked 400V and 3-phase used as much a possible. (In Sweden lot's of stuff, like washing machines, tumble dryers, dishwashers, kettles, irons etc. draw 2200W... Switzerland is a another good example. Sockets have a 10A rating and therefore 400V is used for loads exceeding 2200 KW.)

On our sockets there are even two "blind" terminals on the 230V sockets, allowing you to use the 230V sockets as a choco block for all 3-phases. (It's allowed in offices but not in homes, since a homeowner is bound to wire it wrongly if he/she replaces the socket.)

Any pros and cons from you on using 400V in domestic environments? Is it a must or a horror?