Re: Question about how alarm triggers work

[Frank Olson <Use_the_email_links@xxxxxxxxxxxxxxxxxxxxxx>]

BIOSMonkey wrote:
> My home is prewired for a security system and it appears that there are single
> wires going to each window/door.  I am confused, though, how a single wire can
> detect the state of a trigger on the end when there is no common ground?
>


Your home was actually prewired for self-destruction.  Pull the wire and
run.  <kidding>

Chances are what you're looking at is jacketed four conductor 22 gauge
wire.  You'll have to pull it down to verify it, but (dollars to donuts)
that's what you've got.