> Here, 3 phases are not wired to domestic customers because they don't 
> need 3 phases.

I know in NZ if an electric stove/oven is fitted, then often two phases
are wired into the house, and the stove has a jumper point on the
connection block that allows the elements to be split between phases or
joined together to run on a single phase. The idea seems to be that a
high power item such as this is best split between phases where
practical to minimise phase balance problems but if costs of providing
the second phase get prohibitive for the advantage then it can be run on
a single phase.


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