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Ethernet over power works by sending the signal along the power wires in the house, so the injector (joined by an Ethernet cable from the switch) sends the signal via the power wires to a receiver (access point) plugged into another power outlet on the same circuit, it literally uses the power lines as an extension cable. The injector goes into one power outlet and the access point into any other power outlet.
So the power comes into the house from the street to the main meter box. From there it is split into 5 separate circuits A to E with 10 power outlets off each circuits, in the office where my router and switch is I plug the injector into circuit A, power outlet 1 (A1) if I plug the access point into any power outlet on circuit A it all works.
If I plug the access point into any power outlet on a different circuit for example the lounge room that is on circuit C that has 10 power outlets they are not connected to the same power circuit but they do all join up at the mains.
If the injector and receiver are on different circuits they don’t work very well, the signal is just too weak crossing the circuits.