NFPA NFPA 72 Fire Alarm Systems 3

Question 1

Under NFPA 72, what is the minimum visible notification appliance (strobe) candela rating for a public area with 16-foot ceilings?

Accepted Answer

75 cd

Answer

NFPA 72 requires a minimum of 75 candela for strobes in rooms with ceiling heights between 10 and 16 feet when mounted on a wall.

Question 2

According to NFPA 72, which initiating device is required in the air ducts of HVAC systems serving multiple floors?

Accepted Answer

Duct smoke detector

Answer

NFPA 72 requires duct smoke detectors in HVAC systems to prevent smoke from being distributed to other areas through ductwork.

Question 3

Under NFPA 72, what is the purpose of a Class A wiring style for initiating device circuits?

Accepted Answer

Allow continued operation after a single open or ground fault

Answer

Class A wiring uses a loop configuration so that a single open or ground fault does not disable the entire circuit, allowing continued operation.

Question 4

According to NFPA 72, what information must be displayed on a fire alarm control unit annunciator?

Accepted Answer

Zone or device location of alarm, supervisory, and trouble conditions

Answer

NFPA 72 requires that the annunciator display the location (zone or device) of alarm, supervisory, and trouble conditions.

Question 5

Under NFPA 72, smoke detectors must be located at minimum how far from a supply air diffuser?

Accepted Answer

3 feet

Answer

NFPA 72 requires smoke detectors to be located at least 3 feet from air supply diffusers to prevent airflow from diluting smoke before it reaches the detector.

NFPA - National Fire Protection Association Practice Test

NFPA - National Fire Protection Association Practice Test

NFPA NFPA 72 Fire Alarm Systems 3