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From NFPA 72, 2002 Edition: “7.4.2.1* To ensure that audible public mode signals are clearly heard, unless otherwise permitted by 7.4.2.2 through 7.4.2.5, they shall have a sound level at least 15 dB above the average ambient sound level or 5 dB above the maximum sound level having a duration of at least 60 seconds, whichever is greater ...
A fire alarm system can vary dramatically in price and complexity, from a single panel with a detector and sounder in a small commercial property to an addressable fire alarm system in a multi-occupancy building. BS 5839 Part 1 categorizes fire alarm systems as: [21]
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."
The word alarm comes from the Old French a l'arme meaning "to the arms", or "to the weapons", telling armed men to pick up their weapons and get ready for action because an enemy may have suddenly appeared. [1] The word alarum is an archaic form of alarm. It was sometimes used as a call to arms in the stage directions of Elizabethan dramas. [2]
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1st alarm fire / box alarm 1st alarm fire/ "all hands" box alarm 2nd alarm fire 3rd alarm fire 4th alarm fire 5th alarm fire Engine companies: 3 5 8 12 16 21 Ladder companies: 2 4 (one operating as FAST) 5 7 9 11 Battalion Chiefs: 1 2 (one as FAST) 6 Squad companies 1 Rescue companies: Deputy Chief RAC unit 1 Satellite units Safety Battalion Chief
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The purpose of fire drills in buildings is to ensure that everyone knows how to exit safely as quickly as possible if a fire, smoke, carbon monoxide, or other emergency occurs, and to familiarize building occupants with the sound of the fire alarm. [1] Before regular fire drills were instituted, an infamous fire broke out at the private ...