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Question about how alarm triggers work

Subject: Question about how alarm triggers work
From: BIOSMonkey <none@xxxxxxxx>
Date: Thu, 15 Dec 2005 13:18:43 -0500
Newsgroups: alt.security.alarms

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?

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