A wire-to-wire short on a Class X circuit will cause what signal at the fire alarm control panel?

A wire-to-wire short on a Class X circuit will cause what signal at the fire alarm control panel?

• A. Alarm
• B. No signal
• C. Trouble
• D. Supervisory

Answer: (C)

Circuit integrity on signaling circuits is being tested. A wire-to-wire short on a Class X circuit creates an abnormal condition that the fire alarm control panel recognizes as a fault. Because this is a wiring fault rather than a fire indication from a device, it does not produce an alarm at the panel. Instead, it triggers a Trouble to alert maintenance that the circuit wiring needs repair. Supervisory signals relate to monitored equipment status changes (like dampers or valves), which isn’t what a simple short on a signaling circuit represents. It isn’t No signal, since the panel is actively indicating a fault.

Circuit integrity on signaling circuits is being tested. A wire-to-wire short on a Class X circuit creates an abnormal condition that the fire alarm control panel recognizes as a fault. Because this is a wiring fault rather than a fire indication from a device, it does not produce an alarm at the panel. Instead, it triggers a Trouble to alert maintenance that the circuit wiring needs repair. Supervisory signals relate to monitored equipment status changes (like dampers or valves), which isn’t what a simple short on a signaling circuit represents. It isn’t No signal, since the panel is actively indicating a fault.