Sorry late in replying. I've been on a bike trip for three days.
We do as little as possible hot over here. But having said that I'm doing a lv. .( as ya say ..240 volts ) course in a couple of weeks.
the bigger towns use several transformers that are all phased the same to feed the L.V. Network.
Most country places have one or two consumers per single phase tranny .. Depending on load required. Some farmers need bigger 3 phase units to supply milking machines etc etc. we install transformers as per the customers requirements.
Hope that helps ( a bit. ).