In a cross-zoning setup with two flame detectors, the fire alarm control panel is configured for a ______ configuration.

In a cross-zoning setup with two flame detectors, the fire alarm control panel is configured for a ______ configuration.

• A. Concurrent
• B. Counting zones
• C. Single-zone
• D. Multiplexed

Answer: (B)

Cross zoning relies on two detectors in separate areas to confirm a fire, reducing false alarms by requiring two independent zone indications before sounding. The fire alarm control panel must be set to count how many zones are signaling fire, and only trigger an alarm when two zones are active within the configured window. That’s why counting zones is the correct configuration here. If it were set to a concurrent or single-zone mode, the system would alarm with fewer than two zone activations, defeating the cross-zoning protection. Multiplexed refers to a different signaling approach and doesn’t describe the two-zone counting logic used in cross zoning.

Cross zoning relies on two detectors in separate areas to confirm a fire, reducing false alarms by requiring two independent zone indications before sounding. The fire alarm control panel must be set to count how many zones are signaling fire, and only trigger an alarm when two zones are active within the configured window. That’s why counting zones is the correct configuration here. If it were set to a concurrent or single-zone mode, the system would alarm with fewer than two zone activations, defeating the cross-zoning protection. Multiplexed refers to a different signaling approach and doesn’t describe the two-zone counting logic used in cross zoning.