Question 233Safety & Environmental - 1st Asst/Chief

The correct answer is D) to the detecting cabinet. In a typical automatic fire alarm system, all zone circuits are connected to the detecting cabinet, which is the central control unit of the system. The detecting cabinet monitors the status of each zone and triggers the appropriate alarm signals in case of a fire detection. The other answer choices are incorrect: A) In parallel - Zone circuits are not connected in parallel, as this would create a single point of failure for the entire system. B) To the trouble alarm supervising resistor - The supervising resistor is used to monitor the integrity of the circuit, not to connect the zone circuits. C) In series - Zone circuits are not connected in series, as this would make the entire system vulnerable to a single point of failure.