I read that new fire alarm units use a 3-wire hookup, is that true generally? Would that be something like pos+neg+signal?
I ask because we have an old alarm system in our house. It was built in ~1976. I know of at least one fire detector that is hard-wired into the alarm system, but if I...
I'm installing a control panel in my garage with a run in conduit I recently buried. The distance between the main panel and garage controller is about 100'.
What size control wire do I need - 22/4 or 18/4?