Barry,
Thanks for your interest in X10!
From our talented tech team: we recommend
that if you have pets, mount your motion
sensors upside down at a height of roughly 3
feet. The detection plane of the sensor
goes out in a straight line from the top of
the motion sensor and down at a 45 degree
angle from the bottom of the sensor.
Mounted at 3 feet upside down the sensor
will not be able to pick up pets shorter
than 3 feet. Also, we have not received any
reports of ceiling fans causing our motion
sensor to falsely detect motion.
Regarding ORCA: if you are an X10
Contractor, please go to
http://www.x10.com/pro/orca.htm and click on
the ORCA link for B2B service agreements.