My whole house block (PZZ01) is now sitting on my neutral line. I did look inside it before I installed it. A few RF coils, an address switch wheel (?) and the ferrite assembly.
Anybody ever taken one of these things apart and figured out how they are intended to work? I also have an XTB II on order, and have to figure out how to set all this up.
My working hypotheses is that I will get best results from simply shorting L1, L2, L3 and neutral together at the device (i.e. not wired to the breakers), creating a blocking filter for incoming (and outoing) X10 signals. Then I can rely on either the XTB II alone, or a one-legged XTB II and my existing active coupler.
If it is an active device, then my hypothesis is incorrect.