On August 14, 2014 at 12:05, Ernie Gilman said...
One detail question from a non-alarm guy: why run an 18-2 from the house to power a siren? I'd think if there's local power to run the zone expander, that could run a siren. I expect the enclosure has a backup battery, so power loss isn't an issue, at least not immediately. Was this perhaps to run a siren signal from the outbuilding back to a siren in the house to alert the main house? In which case, why not a dry contact?
Ernie, most security systems only have one Siren/Bell output. You want both sirens to sound during an alarm whether it be in the house or the detached garage and the easiest way to do this is to terminate both sirens onto the Siren/Bell output.
