Ceiling Mounted Fire Alarm Strobe Coverage

2 3 vertical placement wall mounted strobes 23 2 4 placement in corridors 24 2 5 room spacing 26 2 6 summary 29 3.

Ceiling mounted fire alarm strobe coverage. System sensor is a global manufacturer of fire and life safety devices in smoke detection carbon monoxide detection. Below ceiling below ceiling below ceiling below ceiling placement wall only wall or ceiling wall or ceiling wall or ceiling wall or ceiling visible signaling appliance requirements according to the adaag ada compliant visual alarms are not required in alterations except where an existing fire alarm system is. 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. 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.

However there s a part of nfpa 72 that talks about only using the ceiling mounted device table if the device is in the middle of the room attached. The strobe is always located in the center of the coverage area. System sensor is pleased to provide this strobe coverage calculator. This seems to prohibit using ceiling strobes in large spaces.

Can someone point out the flaw in this thinking. Strobes feature field selectable candela settings and are compatible with 12 or. Calculations include the effect of polar distribution using the guidelines identified in ul 1971. System sensor is a global manufacturer of fire and life safety devices in smoke detection carbon.

Calculates spacing for wall and ceiling mounted strobe appliances based on chapter 7 of the 2002 edition of nfpa 72. If the ceilings are higher than 30 feet the strobes must be mounted on the wall. Ceiling mounted fire strobes should not be more than 30 feet above the floor. I have a large room 200x200 without many walls so want to use ceiling mounted devices.

Strobe application 31 3 1 vertical placement non sleeping areas 31 3 2 strobe spacing 33 3 2 1 square rooms 33 3 2 2 rectangular rooms 34 3 2 3 irregular rooms 34 3 2 4 large rooms 35 3 3 applications for ceiling mounted strobes 38. Refer to the annex of nfpa 72 for exceptions to these guidelines a 18 5 4 3. Which permits the use of a performance based alternative in lieu of tables for spacing ceiling mounted audible visible devices. These calculations are.

The strobe tool calculates the illumination at each of the angles in the horizontal and vertical planes. See 18 5 4 1 and 18 5 4 2 and for ceiling mounted strobes no more than 30 ft. Low ceiling heights do not permit mounting at a minimum of 80 inches visible appliances shall be mounted within 6 inches of the ceiling.