CAT Inspection & Quality Control 5

Question 1

A passive infrared (PIR) motion detector is repeatedly triggering false alarms near a window. What is the most likely cause?

Accepted Answer

Direct sunlight or radiant heat changes through the window are entering the detection zone

Answer

PIR detectors sense infrared radiation changes; rapid temperature shifts from sunlight through glass mimic body heat signatures and cause false trips.

Question 2

What is the maximum permitted voltage drop across a notification appliance circuit (NAC) that causes concern during inspection?

Accepted Answer

Voltage at the last device must remain within the device's listed operating voltage range

Answer

NFPA 72 and device listings require that all appliances receive voltage within their listed operating range under full load conditions.

Question 3

During a quality control walkthrough, the inspector notes a strobe mounted at 96 inches above finished floor (AFF) in a corridor. What is the issue?

Accepted Answer

NFPA 72 requires strobes in corridors to be mounted between 80 and 96 inches AFF, so 96 inches is at the maximum limit and should be verified as compliant

Answer

NFPA 72 allows corridor strobe mounting between 80 and 96 inches AFF; 96 inches is compliant but at the limit and should be confirmed.

Question 4

A technician is reviewing installation records and finds no documentation of a pre-signal delay programmed into the fire alarm system. Why is this significant?

Accepted Answer

Pre-signal delays require AHJ approval and must be documented; their use is restricted to specific occupancy types

Answer

NFPA 72 permits pre-signal (positive alarm sequence) only in specific occupancy types with AHJ approval and mandatory documentation.

Question 5

What action is required when an inspection finds that a fire alarm control panel has been modified with unauthorized field wiring not shown on approved drawings?

Accepted Answer

Document the discrepancy, notify the AHJ, and update as-built drawings to reflect the actual installation

Answer

Unauthorized modifications must be reported to the AHJ and as-built drawings updated to maintain code compliance and accurate system records.

(CAT) Certified Alarm Technician Level I Practice Test

(CAT) Certified Alarm Technician Level I Practice Test

CAT Inspection & Quality Control 5