I
have
an idea about this. I think X10 appliance modules sense the voltage at
the
load side of the switch. If the voltage does not go off when the switch is
turned off (or on when it is turned on) they rattle the switch a few times,
presumably to try and free up a stuck pair of contacts.
Also,
they have "local control" which also monitors the output and is designed to
switch the load on if you turn on and off the switch a few times. This can
cause
the module to switch itself when connected to unusual loads.
There
are mods to disable the above but I have no experience of them.
I
think there is a module available which just gives a low voltage output
rather
than an appliance output? Sorry, can't remember the name but I would be
inclined
to use this switching a relay in parallel with the timer and leave
appliance
modules for switching simple appliances.
Hope
this helps.
Kevin
Yahoo! Groups
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