NFPA NFPA 72 Fire Alarm Systems

Question 1

Under NFPA 72, what is the maximum allowable sound level for a public mode audible alarm signal in a sleeping area?

Accepted Answer

75 dB(A)

Answer

NFPA 72 requires that public mode audible alarms produce a sound level of at least 75 dB(A) at the pillow in sleeping areas.

Question 2

According to NFPA 72, what is the maximum spacing for heat detectors with a listed spacing of 50 feet in a smooth ceiling room?

Accepted Answer

50 feet

Answer

NFPA 72 permits heat detectors to be installed at their listed spacing, which in this case is 50 feet between detectors on a smooth ceiling.

Question 3

Under NFPA 72, which initiating device is classified as a spot-type smoke detector?

Accepted Answer

Ionization smoke detector

Answer

An ionization smoke detector is a spot-type detector that responds to products of combustion in its immediate vicinity.

Question 4

According to NFPA 72, what is the maximum allowable supervisory signal response time from the control unit to the supervising station?

Accepted Answer

5 minutes

Answer

NFPA 72 requires that supervisory signals be received at the supervising station within 5 minutes of occurrence.

Question 5

Under NFPA 72, what minimum standby battery capacity is required for a fire alarm control unit?

Accepted Answer

24 hours standby + 5 minutes alarm

Answer

NFPA 72 requires fire alarm control units to have battery backup for 24 hours in standby followed by 5 minutes in full alarm.

NFPA - National Fire Protection Association Practice Test