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An Initiating Device Circuit (known as a Signalling Line Circuit (SLC) in addressable systems) connected to multiple devices within the same "zone" of protection, effectively provides 3 distinct states of information about the zone to the panel: Normal, Trouble, or Alarm. The state of each initiating device circuit within a zone displays at the ...
Security alarms, emergency door releases, industrial fire suppression systems, and hazardous material leak alarms are all examples of specialty systems which are sometimes activated with similar manual initiating devices to a fire alarm. They may be linked to fire alarm systems to varying degrees.
Initiating devices used to activate a fire alarm system are either manually or automatically actuated devices. Manually actuated devices, also known as fire alarm boxes , manual pull stations, or simply pull stations, break glass stations, and (in Europe) call points, are installed to be readily located (usually near the exits of a floor or ...
The NFPA 72 "covers the application, installation, location, performance, inspection, testing, and maintenance of fire alarm systems, supervising station alarm systems, public emergency alarm reporting systems, fire warning equipment and emergency communications systems (ECS), and their components."
Voice evacuation systems (also called Voice Alarm Systems) have become popular in most countries. Voice evacuation alarms typically are not as loud as horns or bells (although generally standards require the same minimum sound pressure levels), and usually sound an alarm tone (typically a slow whoop, code-3, or chime tone, although this depends ...
At approximately 10:50 a.m. local time, the fire alarm went off following a short circuit on the power rail of an elevator between the second floor and the top, operating and management company ...