I made a post earlier about converting my son's pool over to an Aqua Logic system. We aren't going to be able to do that until this winter. It's just too hot here (Phoenix) to be digging a 125' trench for conduit...so we'll wait for cooler weather. But we want to "automate" one of his pumps with an X10 switch. Let me tell you what he has now. He has 4 pumps. One is for the spa jets and is controlled by a spa side air switch. One is for the spill over, and one is for the water feature. These two pumps are X10 controlled and there is a box that houses two X10 switches and their corresponding relays that are used for the 240V pumps. Then the fourth pump is for the filtration and cleaning system and it is only controlled by a mechanical timer. So anytime he wants to run that outside it's timer schedule, he has to go back to the pool equipment and manually flip a switch on the timer. I have purchased an X10 240V 20A switch (XPS2). This switch is self contained...uses no additional relay...and is designed to be wired in series with the power supply to the load. My question is...can I splice into the line voltage at the timer, (install an additional circuit using that as a line source) wire in the X10, and connect the load side of the X10 to the load side of the timer? In other words, I would wire the switch in parallel with the timer. My only concern in doing this is this will apply power to the load side of the timer when the X10 is activated and supply power to the load side of the X10 switch when the timer is activated. My degree wasn't in physics, so maybe some of you pros can fill me in on whether or not this would be a safe approach.