I'm in the process of installing an alarm system that supports 2 or 4 wire low voltage fire alarms.
The house is wired with high voltage single wire smoke alarms.
As I understand it, there are relays that can wire into the circuit and either act as the sender or receiver for low or high voltage accessory devices like pull switches or lighting. An example device is referenced here.
As I also understand it, these relays cannot be used to wire into alarm panels.
So my question: What is the reasoning behind not allowing this? Is it just because multi-wire detectors support zoning, or is it actually dangerous to do this?
Are there devices that exist that do allow me to do this, or do I need to switch detectors?