What is the maximum number of Q50 / NC50 systems I can have within RF proximity of each other and how do I stop them interfering with each other?

Hey there - the maximum number of NC-50 you can have in a system is 254.
I'm not sure how many Q50s you can have in a system though.

When setting up a multiple q50/nc-50 system, each nc-50 has its own NevoID and each remote has its own address. So each remote knows which nc-50s to talk to once assoicated on the z-wave network.

Hope this helps

Drew