F89 F89 Communication Systems and Emergency Notifications Questions and Answers 4 — Questions and Answers
Question 1: Under NFPA 72, how frequently must voice intelligibility testing be conducted on a mass notification system in a high-rise building?
- Every 6 months
- Annually (Correct answer)
- Every 2 years
- Only at initial acceptance
Correct answer: Annually
NFPA 72 requires annual testing of voice intelligibility for mass notification and emergency communication systems.
Question 2: A Fire and Life Safety Director discovers that the building's two-way fire department communication (firefighter phone) jacks on floors 12 through 18 are inoperative. What is the FIRST action to take?
- Notify the fire department and post a fire watch on those floors (Correct answer)
- Disable the entire voice alarm system until repairs are made
- Continue normal operations and log the deficiency for the next quarterly inspection
- Silence all alarms on the affected floors
Correct answer: Notify the fire department and post a fire watch on those floors
Inoperative firefighter phone jacks constitute an impairment requiring immediate notification to the fire department and implementation of a fire watch.
Question 3: Which condition would cause a Class A notification appliance circuit to continue operating even after a single open-circuit fault?
- The circuit is wired in a loop returning to the panel (Correct answer)
- The circuit uses wireless end-to-end supervision
- The circuit has a built-in ground-fault interrupter
- The circuit is connected to a secondary power supply
Correct answer: The circuit is wired in a loop returning to the panel
Class A wiring uses a loop configuration so that an open fault isolates only one segment while the remainder of the circuit continues to operate.
Question 4: During an emergency, the fire command station microphone is used but occupants report they cannot hear announcements on the 30th floor. What component is MOST likely at fault?
- A tripped amplifier or speaker circuit serving that zone (Correct answer)
- The primary power supply transformer
- The smoke detector on the 30th floor
- The fire department connection (FDC)
Correct answer: A tripped amplifier or speaker circuit serving that zone
An amplifier or speaker circuit failure serving a specific zone would prevent announcements from reaching that floor while leaving other zones unaffected.
Question 5: What is the purpose of the 'alert tone' that precedes a pre-recorded or live voice emergency message?
- To attract attention and signal that an important announcement will follow (Correct answer)
- To silence background music in the building
- To test the microphone level before the message
- To activate the elevator recall function
Correct answer: To attract attention and signal that an important announcement will follow
The alert tone (typically a three-pulse temporal pattern or attention signal) draws occupants' attention before a spoken message begins.
Question 6: In a high-rise building, the F89 protocol calls for 'defend-in-place' for most occupants. Which communication action BEST supports this strategy?
- Providing floor-specific instructions that direct only affected floors to act (Correct answer)
- Broadcasting a building-wide evacuation alarm simultaneously on all floors
- Silencing alarms above the fire floor to avoid confusion
- Disabling elevator recall so occupants can self-evacuate
Correct answer: Providing floor-specific instructions that direct only affected floors to act
Floor-specific announcements limit unnecessary movement and direct occupants on the fire floor and adjacent floors while others shelter in place.
Question 7: A secondary (backup) power supply for the fire alarm and notification system must be capable of operating the system in standby mode for at least how long under NFPA 72?
- 24 hours (Correct answer)
- 4 hours
- 8 hours
- 12 hours
Correct answer: 24 hours
NFPA 72 requires the secondary power supply to maintain standby operation for a minimum of 24 hours followed by 5 minutes of alarm.
F89 F89 Communication Systems and Emergency Notifications Questions and Answers 4
Under NFPA 72, how frequently must voice intelligibility testing be conducted on a mass notification system in a high-rise building?