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Tuesday, April 22, 2014

Fire Alarm Requirements for Group B Occupancy

Group B: (Business)


Systems only need to be monitored if the facility has 20 + sprinkler heads.

A manual fire alarm system (pull stations) shall be installed where ONE of the following conditions exist
·        The combined occupant load of the entire Group B facility is 500 or more persons.
·        The occupant load is more than 100 persons above or below the lowest level of exit discharge.
·        An ambulatory care facility is located within the fire area.

Ambulatory care facilities within a Group B:


Group B Occupancy Fire Alarm Requirements When an ambulatory care facility is located within the fire area of a Group B occupancy, you shall install an electronically supervised smoke detection system throughout the ambulatory care area as well as public use areas outside of the tenant space such as public corridors and elevator lobbies.

"Exception"

·         Electronically supervised smoke detectors do not need to be installed if the facility is equipped with an automatic sprinkler system in which the Waterflow activates the occupant notification system.

If the facility is provided with an approved automatic sprinkler system in which the Waterflow activates the occupant notification system a minimum of one manual pull station is required to be provided in an area approved by the local AHJ (Authority Having Jurisdiction)

Note: Emergency voice/alarm communications systems shall be provided for high rise applications.  High rise buildings are classified by the International Building Code as a structure that has occupied floors located more than 75 feet above the lowest level of fire department vehicle access.

UL 268 Automatic Smoke Detection Requirements:


System smoke detectors shall be provided for all of the following applications:  (Group B with a total occupant load of 500 + person or more than 100 persons above or below the lowest level of exit discharge.)

Above control panels and power supplies
For the purpose of elevator capture
On all HVAC units over 2,000 CFM (Duct Detector)
For releasing service
Fire Smoke Dampers
Delayed egress locks

Fire Alarm Notification Requirements:


Public Mode Audibility: You must have 15 dB above average ambient sound level or 5 dB above the maximum sound level for at least 60 seconds whichever is greater.