Ceiling Mounted Fire Alarm Devices

This is a continuation on the series of articles about the most important requirements in nfpa 72 national fire alarm code book.

Ceiling mounted fire alarm devices.

Most contractors install strobe lights to comply with the national fire alarm and signaling code by simply using a combination audible visible appliance everywhere one or the other is shown on the plans. Generally speaking there are two kinds. Except where an existing fire alarm system is upgraded or replaced or a new fire alarm system is installed the adaag goes on to define an alteration as a change to a building or facilitythat affects or could affect the. The strobe is always located in the center of the coverage area.

Currently the nfpa 72 and ifc 2006 edition ansi 2003 have been harmonized. 177 cd ceiling 177 cd ceiling 177 cd ceiling 177 cd ceiling. 3 3 applications for ceiling mounted strobes 38 3 4 corridors 42 3 5 sleeping areas 43 3 6 strobes in harsh and hazardous environments 45 3 7 summary 46 4. A plan view of a ceiling mounted fire alarm notification device s coverage area shows that the coverage projects outward along the strobe s mounting surface at an equal distance on all sides creating the square coverage areas listed in nfpa 72.

If the ceilings are higher than 30 feet the strobes must be mounted on the wall. Low ceiling heights do not permit mounting at a minimum of 80 inches visible appliances shall be mounted within 6 inches of the ceiling. System sensor is a global manufacturer of fire and life safety devices in smoke detection carbon monoxide detection and notification technology. Ceiling mounted fire strobes should not be more than 30 feet above the floor.

To effectively guide people to safety in case of an emergency fire alarm devices in public and commercial buildings must be carefully matched to local requirements. Compatible with 12 or 24 volt systems. Refer to the annex of nfpa 72 for exceptions to these guidelines a 18 5 4 3. 7 field selectable candela settings for wall and ceiling mount devices and rotary switches to select horn tone and volume settings.

It should be obvious that if you follow this method of compliance you will either have an incorrect number of audible appliances or an incorrect number of visible appliances. Wall mounted fire strobes must be placed 80 to 96 inches above the floor and at least six inches from the ceiling in all non sleeping areas. See 18 5 4 1 and 18 5 4 2 and for ceiling mounted strobes no more than 30 ft. Lay the foundation for reliable alarming and evacuation in your building with our extensive portfolio of addressable ceiling and wall mounted sounders voice sounders and beacons.