Mikey: That makes sense. UPSes and some
power bars have a noise trap which will
think the X10 signal is noise and will suck
it up. If your controller is too close
(electrically) to the UPS, it will
significantly reduce the strength of your
signal before it gets to your breaker
panel.
You could put in a dedicated circuit for
your CM15a. That would ensure you have a
strong signal at your breaker panel. The
problem would be that modules on the same
circuit as the UPS might not work
properly. A better option might be to plug
your UPS into a blocking filter. This
would prevent the X10 signal from passing
through it and getting sucked up by the UPS.
AutomatedOutlet
(
http://www.automatedoutlet.com) have the
X10 Pro XPPF 5 Amp Plug-in Filter for
$15.99 right now. A 5A filter should be
adequate, though you might want to do the
math to make sure. Otherwise you can get
10A and 15A plug-in filters and 20A wire in
filters. Just remember the X10 signal will
not travel through the filter so don’t put
the CM15a on one side of the filter and a
module on the other side.
I am surprised it is the Leviton switches
you are having problems with. Other people
on here say they are the best.
I hope this helps.