Where you get into the exotica is 3-phase service.
There, you need a
cooperating utility and a deep pocketbook. Be prepared to be turned
down flat by your utility with the excuse that "We don't distribute 3
phase in your area".
A friend of mine who collects machine tools (!) was getting fed up with
the 3 phase converter. So he called his 'energy supplier' to ask about
a 3 phase supply. The first question he was asked is priceless
'Are you asking about 3 phase electricity or 3 phase gas?'
-tony