A wire-to-wire short on a Class A circuit used for notification appliances or addressable signaling line circuits will cause which signal at the control panel?

A wire-to-wire short on a Class A circuit used for notification appliances or addressable signaling line circuits will cause which signal at the control panel?

• A. Alarm
• B. Normal
• C. Trouble
• D. Supervisory

Answer: (C)

On supervised Class A signaling circuits, the wiring is continuously monitored for faults. A wire-to-wire short is a fault within the loop that compromises its integrity, but it isn’t an actual initiating event that would trigger alarms. Because the system has detected a fault on the circuit, it flags a Trouble at the control panel to alert maintenance to locate and repair the fault. An actual alarm would require an initiating event causing the notification appliances or addressable devices to activate. Supervisory is used for monitored conditions indicating devices or systems needing oversight, not a simple short. Normal would mean no fault present.

On supervised Class A signaling circuits, the wiring is continuously monitored for faults. A wire-to-wire short is a fault within the loop that compromises its integrity, but it isn’t an actual initiating event that would trigger alarms. Because the system has detected a fault on the circuit, it flags a Trouble at the control panel to alert maintenance to locate and repair the fault. An actual alarm would require an initiating event causing the notification appliances or addressable devices to activate. Supervisory is used for monitored conditions indicating devices or systems needing oversight, not a simple short. Normal would mean no fault present.