I have two questions about Mains filters and their impedance effect on PLC.
1) With respect to signal propagation relative to the Line impedance:
As the signal is sent, via the power line, it will take the path of least resistance. Therefore the line to the PSU needs to have a high impedance (greater than 50 Ohm) to ensure the signal is not sent to the PSU. What is the Max impedance I can add to my filter before the PSU stops working?
There are a fuse and an NTC used in series with one another. The fuse is required to prevent fires from starting. I would like to know if a PTC could replace the function of the fuse. If so would having a PTC in series with an NTC be contradicting in their functionality, or would they just need to be placed far enough apart so that their temp's do not interfere with one another?
For question one the PTC and NTC resulting impedance will be included in the overall impedance of the filter.