Fire Alarm Systems Basics

Fire alarm systems are a combination of initiation devices tied into a main control panel. Any initiation device that activates will cause an alarm condition on the main control panel that will in turn activate notification devices, relays, and if set up, send notification of alarm to fire department via central station, masterbox, or radio transmitter.

Fire alarm block diagram

Fire alarm block diagram

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Here is a good site with a many articles about fire alarms. http://ecmweb.com/design/understanding-basic-fire-alarm-systems