OK. I think I'll try a hardwired approach, first, and then, if that is not satisfactory, I'll try RF.

Now to the nitty gritty. I propose to have a double gang electrical box containing a receptacle in one gang and a passive bridge (this one [Link: homeautomationnet.com] ) in the other. Coming in would be a 12/2 romex-like wire from the branch circuit of the X10 transmitter. Also coming in would be 12/2 from the output of the UPS. The input of the bridge would be spliced into the branch circuit sourcing the X10. The output of the bridge would be spliced to the line from the UPS, and also pigtailed to the receptacle. The appliance module would then be plugged into the receptacle, and the projector would be plugged into the appliance module.

Counting box capacity... 2 from circuit originating the X10 signals, 2 from UPS , 2 for bridge device, 2 for receptacle, 1 for the grounds, thus requiring box rated for 9 #12 conductors. No sweat for double gang box.

Voila! Power-protected, X10 controlled projector. Sound OK?

Regards.

DG