My PLM is near a Surge Suppressor, but not connected directly to it. I have the ISY-99i/IR, so it is near my entertainment center because I plan to use my Harmony remote with it. All of my Entertainment center equipment is connected to a surge suppressor. I do have a SmartHome X10 repeater and I think my phases are coupled, but not sure how to prove it. Most X10 commands reach the intended destinations, but some get lost no matter what I try. X10 commands sent from my ISY always reach the intended destination OK, but not the other way around. I am gradually phasing out X10, but I have some modules that I really like. I updated some X10 lamp modules with a Solid State Relay so they are 100% silent and work great with CFl's and LED's and they are really fast. I also like the X10 Rocket socket lamp socket because it is silent. Having all X10 commands go through my ISY is nice because it keeps track of the ON/Off status, but reaching it from all locations in my house is the puzzle I need to figure out now.