What is the use of three phase power supply when the house is divided into three portions and each connected to a single phase?

Question

I recently read that the three phase power supply was used to meet increasing power demand.I understand that by using three phases of current that are offseted slightly, allow you to get a near to peak voltage most of time.
Shouldnt all the devices then be connected to all three phases instead of one phase to achieve this?

In: Engineering

Answer 1

It’s much more efficient for the transmission of power. Because normally you’d need two wires to transmit single phase power anyways, using 3 phase power means you get 3x the power for the cost of one extra wire.

For each house it’s irrelevant, since they need to turn it back to single phase power for the appliances (single phase power is much easier to work with and so makes the appliances cheaper)

https://www.vertiv.com/en-emea/about/news-and-insights/articles/educational-articles/three-phase-power-what-it-is-and-the-benefits-it-brings/