PZZ01 & XPCP on same pair of breakers

[vidiat]

Is it possible to connect an XPCP and a PZZ01 to the same pair of 15A breakers in the breaker box?

[JeffVolp]

Is it possible to connect an XPCP and a PZZ01 to the same pair of 15A breakers in the breaker box?

My first thought was, sure, no problem.  Then I remembered that the PZZ01 is also supposed to be a signal coupler.  I don't know if it is as effective as the XPCP.

That brings up a thorny issue.  I have two different versions of the XPCP.  One inverts the phase of the signal, and the other does not.  I am not sure whether or not the PZZ01 inverts the phase of the signal.  If you install one that inverts, and the other that does not, the two will tend to cancel one another out, and you would be left with less signal than if only one was installed.

Unfortunately, without measuring the transfer function of both devices, it is impossible to say how well the will work with each other.

Jeff

[Brian H]

Jeff; I have an XPCP with separate phase inputs.
L1&N1 for one line and L2&N2 for the other line.
The diagram shows you have to connect N1&N2 to neutral.
I would think mine could be wired inverted or straight.
My meter shows no connections between N1&N2.

I am using one now as a scope input.
One Line has a 120 volt power cord on it the other goes to terminals I connect my scope to.
So far I have found no stray AC voltages on the scope side from the other line side.

[JeffVolp]

Jeff; I have an XPCP with separate phase inputs.
L1&N1 for one line and L2&N2 for the other line.
The diagram shows you have to connect N1&N2 to neutral.
I would think mine could be wired inverted or straight.
My meter shows no connections between N1&N2.

Yes, that is correct.  I have taken a couple apart to examine the circuitry.  There are parallel-resonant circuits on both sides with the secondaries of the coupling transformers interconnected with high-voltage capacitors.  So there is total DC isolation between both coupling networks.

And yes, the phase of the signal can either be inverted or not, depending on how the XPCP is wired.  The difficulty is knowing how to wire it.  The early XPCP that I disassembled inverted the signal when both white wires were connected to neutral.  The "Decora" version with the screw connectors did not invert the signal when wired as described.  Since the signal phase only depends on how the wires are installed onto the PCB, there is no way to be sure whether the unit inverts or not unless it is actually checked with a scope.

Jeff

[vidiat]

Thanks JeffVolp for the prompt reply.

Assumung that the XPCP and a PZZ01 are both found to not invert the phase, can they both be connected to the same pair of 15A 120V breakers?

[JeffVolp]

Assumung that the XPCP and a PZZ01 are both found to not invert the phase, can they both be connected to the same pair of 15A 120V breakers?

Certainly.

Jeff