American electricity in Australia

[Besoeker]

And from what I understand dwellings or other "light commercial" applications only needing single phase supply will generally be supplied by one phase and neutral conductor from a 400/230 wye system.

Now maybe if you only need single phase in an isolated area they maybe supply you from a simple two wire single phase transformer?

Yes, possibly maybe even probably. I have a notion that it may be derived from a 3,300V/230V transformer but it isn't an area I get involved with.