Almost all homes are connected to single-phase electricity. The single-phase that a home is connected to is just one of the
An individual house puts all of its load onto one of the phases, so different houses get connected to different phases to help balance the load. Over a small number of houses the load can still be very
To enable different houses to be connected to different phases, the three phases must be connected differently to the delta connection that originates with the generator. The change in connection is done in the last transformer in the distribution system.