They say you should learn something new everyday... I have spent the last 2 days, about 30 hours on site now, trying to get a large UPB controlled lighting system to function in a new home that has a Crestron infiNET (ZigBee protocol) lighting control system installed for the interior. What a mess! Basically, the Crestron dimmer/switch modules use the same 'brain' as the UPB switch modules do, but they also have wireless RF transmit & receive ability. Bottom line is that these Crestron modules put up MASSIVE levels of noise onto the electrical system, to the point that you cannot begin to establish a UPB network. We have now isolated 12 individual circuits that power up the various Crestron 'manifolds' of infiNet modules and have ordered in line noise filters that the EC will be installing at the two main panels. Lesson learned? Do a lot of research as to what high tech. systems the client has and try to find out if they will work alongside UPB BEFORE you sell the system!! ( This is a 17 zone, $90K outdoor lighting system we are talking about) Next chore? Installing a 3-Phase Phase Coupler between 200A Panel A and 200A Panel B! Who knew??