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2,3,4 wire smoke detectors?

Subject: 2,3,4 wire smoke detectors?
From: BoyntonStu <stu@xxxxxxxxxx>
Date: Mon, 16 Jul 2007 17:07:41 -0700
Newsgroups: alt.security.alarms

My smoke detectors have 3 wires coming out of them.

Black, white, and yellow.

Black and white fr 110VAC and the yellow for interconnectivity.

All I see discussed is 2 and 4 wire.

Would someone please unconfuse me?

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