On the Wye versus Delta thing on stoves:
Traditionally, our ranges have 400V rings. Thus, the range has four wires: L,L,L,PE and is hard wired. (You can also wire it L,L,PE and thus run it on 400V single-phase.)
Some new ranges are fitted with five pin (Perixlex) 3-ph plugs with a neutral. I think they are wye and can be wired to 230V too. (I should know this!) I forsee problems for many homeowners, as there are only four (1.5 mm2) wires coming out of the wall...
Today 400V only ranges have a Perilex plug where the neutral pin has been left out.
