Question 1

According to NFPA 72, what is the minimum candela rating required for a visible notification appliance (strobe) located in a corridor that is no more than 20 feet wide?

Accepted Answer

NFPA 72 Table 18.5.5.4.1(a) specifies that in corridors up to 20 feet wide, a single strobe placed at the midpoint can use a 15-candela rating. Higher candela ratings are required for wider areas or when strobes are placed at greater distances from occupants.

Question 2

According to NFPA 72, what is the maximum allowable spacing between smoke detectors installed on a smooth flat ceiling?

Accepted Answer

NFPA 72 specifies that the listed spacing for spot-type smoke detectors is 30 feet (as a listed spacing), but detectors must be placed so that no point on the ceiling is more than 0.7 times the listed spacing from a detector. For a 30-foot listed spacing, detectors must cover areas within approximately 21 feet.

Question 3

NFPA 72 requires that fire alarm systems provide a minimum of how many hours of standby power after primary power failure?

Accepted Answer

NFPA 72 Section 10.6.7 requires that fire alarm systems be capable of operating in normal supervisory mode for a minimum of 24 hours after loss of primary AC power, followed by a minimum of 5 minutes of alarm operation (or 15 minutes for voice evacuation systems).

Question 4

Under NFPA 72, what is the maximum sound pressure level that audible notification appliances shall produce to avoid potential hearing damage?

Accepted Answer

NFPA 72 Section 18.4.3 states that audible appliances shall not exceed 110 dB at the minimum hearing distance. This cap is intended to prevent hearing damage to building occupants during alarm conditions.

Question 5

NFPA 72 defines 'pathway survivability' as the ability of signaling pathways to continue to operate under which condition?

Accepted Answer

Pathway survivability, as defined in NFPA 72, refers to the ability of wiring, cables, and equipment to continue functioning when exposed to fire conditions for a specified duration. NFPA 72 establishes three levels of pathway survivability (Levels 0, 1, 2, and 3) based on the fire resistance rating of the pathway.

Question 6

According to NFPA 72, an alarm signal must be transmitted to the supervising station within how many seconds of activation?

Accepted Answer

NFPA 72 Section 26.6.3 requires that an alarm signal be received at the supervising station within 90 seconds of activation of the initiating device. This requirement ensures timely notification to the monitoring facility so that emergency services can be dispatched promptly.

Question 7

Under NFPA 72, what is the minimum height above the floor at which a wall-mounted visible notification appliance (strobe) must be installed?

Accepted Answer

NFPA 72 Section 18.5.5.4.2 requires that wall-mounted visible notification appliances be mounted with the lens not less than 80 inches (6 feet 8 inches) above the finished floor, and not greater than 96 inches (8 feet) above the finished floor, or within 6 inches of the ceiling when the ceiling is less than 96 inches high.

Question 8

NFPA 72 requires that smoke detectors be installed in which location relative to HVAC supply air vents to prevent nuisance alarms from air turbulence?

Accepted Answer

NFPA 72 Section 17.7.3.2 requires that spot-type smoke detectors be located not closer than 3 feet from a supply air vent or other high-air-velocity areas. Placing detectors too close to supply vents can cause air turbulence that prevents smoke from entering the detector chamber or creates nuisance alarms.

Question 9

According to NFPA 72, what color are the lenses of visible notification appliances (strobes) required to be?

Accepted Answer

NFPA 72 Section 18.5.5.1 requires that visible notification appliances used for fire alarm signaling produce clear or nominal white light. Colored lenses (such as red or amber) are not acceptable for fire alarm visible notification because they reduce the effective candela output and do not meet the photometric requirements of the standard.

Question 10

Under NFPA 72, sleeping areas such as hotel rooms require a minimum visible notification appliance candela rating of:

Accepted Answer

NFPA 72 Table 18.5.5.4.1(b) requires that visible appliances installed in sleeping areas provide a minimum of 110 candela when a single wall-mounted strobe is used in a room up to 20 feet by 20 feet. The higher candela requirement accounts for the fact that sleeping occupants are less likely to notice lower-intensity strobes.

NFPA 72 Code Requirements Practice Questions

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