NFPA 72 requires strobe lights with a luminous intensity of 110 candelas (cd) to be installed on the wall of sleeping areas at least 24 inches from the ceiling . For 177 cd strobes, the lights must be installed no more than 24 inches from the ceiling. The light must also be within 16 feet of the head of the bed.
When two or more strobe lights are visible from a single location they must?
If two strobes are in any field of view they must flash in synchronization , and any interruption in the clear viewing path will require additional strobes.
Are strobes required in hotel rooms?
Buildings with 151 to 200 sleeping rooms, six rooms must be equipped. If there are 201 to 300 sleeping rooms, seven rooms should have fire alarm strobes installed. For hotels with 501 to 1000 rooms, 2 percent of the rooms must be equipped with strobes .
Are strobes required in private offices?
1 General stipulates that alarm systems required to be accessible shall provide visible signals in restrooms, in other general and common use areas, and in hallways and lobbies. ... Therefore, visual alarms are not required in individual employee offices and work stations .
Are strobes required in stairwells?
Strobe Lights. ... As with horns, NFPA 72 does not require strobes to be installed ; the applicable building, fire or life safety code does. NFPA 72 provides requirements for mounting heights, brightness, location and synchronization.
What is a fire alarm strobe light?
Strobe lights are required in fire alarm systems to provide a visual alert of an emergency to people with a hearing loss .
Which fire alarm system is the simplest of all systems?
A conventional system is the simplest type of protected premises alarm system. When an alarm-initiating device, such as a smoke detector, sends a signal to the FACU, all of the alarm-signaling devices operate simultaneously (Figure 14.11, p. 616).
Where are pull stations required?
NFPA 72 requires a pull station within 60 inches of every individual exit , and for groups of doors that are more than 40 feet wide away from each other, there must be a pull station on both sides of the grouping. The placement of fire alarm pull stations is critical to ensuring they provide the protection intended.
How loud should a fire alarm be?
Obviously, the goal of a fire alarm is to make sure everyone in the building knows to evacuate. That’s why the NFPA requires fire alarm horns and sirens to sound louder than ambient noises. The precise requirement is 15 dB above the average noise level or 5 dB above the maximum ambient sound, whichever is greater.
What is the height of a fire alarm pull station?
Manual Fire Alarm Boxes (Pull Stations) – The height of the manual fire alarm boxes shall be a minimum of 42 inches and a maximum of 54 inches measured vertically , from the floor level to the activating handle or lever of the box.
Where are speaker strobes required?
NFPA 72 requires strobes installed in hallways and corridors to be visible from anywhere. The code states these specific requirements: Strobes must be installed no further than 100 feet apart down the length of a hallway. Strobes must be located within 15 feet of either end of a hallway.
What is the latest NFPA 72?
The 2019 edition of NFPA 72, National Fire Alarm and Signaling Code presents the most advanced provisions ever developed for the application, installation, location, performance, and inspection, testing, and maintenance of fire alarm and emergency communications systems — including Mass Notification Systems (MNS).
How high should a fire alarm panel be mounted?
A new requirement for the 2019 edition of NFPA 72 also specifies the maximum and minimum mounting heights for control equipment as 6 ft (1.8m) and 15 in. (375 mm) , respectively. So, as you can see there is no definitive answer as to where a fire alarm control unit needs to be installed.
Why do fire alarms have strobe lights?
Strobe lights provide valuable visual alert that something is wrong , alerting people and individuals with hearing impairment that an emergency situation exists.
How far apart should horn strobes be?
NFPA 72 requires strobes to be located so that the illumination can be seen regardless of the viewer’s orientation, with maximum spacing between devices, not to exceed 100 ft. (see Figure 2).
What are horn strobes?
Horn strobes combine audible and visual alarms to alert the occupants to evacuate the premises . ... Voice evacuation systems are required by code in certain occupancy types.
