X10 is very susceptible to powerline noise, and there is a lot more today than 20 or 40 years ago mostly being introduced by the increased number of AC-DC power adapters/chargers that are used in most homes as well as solid-state devices using AC-DC transformers for their circuit boards.
Despite that, I continue to reliably use a half-dozen or so X10 devices and a 25-year-old CM11A controller which are now integrated with my Home Assistant setup. Never worked with any alarm/security components.
X10 is very susceptible to powerline noise, and there is a lot more today than 20 or 40 years ago mostly being introduced by the increased number of AC-DC power adapters/chargers that are used in most homes as well as solid-state devices using AC-DC transformers for their circuit boards.
Despite that, I continue to reliably use a half-dozen or so X10 devices and a 25-year-old CM11A controller which are now integrated with my Home Assistant setup. Never worked with any alarm/security components.