Yes there's a snatch. I'm speaking now from a Finnish perspective, but your house should be receiving several (3) phases from the power company. At your house, these phases are distributed around the house to different wall outlets for a better overall balance across the phases. In my house, to determine which wall sockets are quaranteed to belong to the same phase I'd just remove the fuse at the fusebox and check which wall outlets then become dead.
This prologue I gave is because the signal is typically unable to connect from one phase to another. If one wing of your mansion is receiving only phase X, the other wing phase Z, those two will have trouble communicating (without a bridging device of some sort).
Last edited by DBTL; 14th May 2006 at 22:06.