@Carl Thank you for the detailed reply. TP-Link has been very slow to give details about how these systems work. From what I have been able to deduce, these kits will work within one leg of a home electrical system. This is much like the old X-10 appliances I used to play with. I found a coupling capacitor that I could conect between the two hot legs of my home electrical system. This would pass the signal from one leg to the other, allowing communication throughout the house. I am thinking that I have the sae situation, and that if I move one breaker to be on the same phase as the other powerline adapter, they might be able to talk to each other. In the meantime, I will check out the links you have supplied. Thank you very much for your help.

Mark