Powerline ethernet on US home mains wiring

        In the USA, electricity is supplied to the house at ~240v with a split-secondary transformer, with the center tap being Neutral, and either end of the secondary being Live. This gives the ~120v the end-user sees with a typical power outlet.

If a powerline ethernet adapter is on a circuit connected to one Live, can it communicate with a adapter on a circuit fed from the other Live connection? If so, are there any performance penalties?