What type of signal indicates a wiring or power problem that could disable part or all of the fire alarm system?

What type of signal indicates a wiring or power problem that could disable part or all of the fire alarm system?

• A. Trouble signal
• B. Alarm signal
• C. Supervisory signal
• D. Fire signal

Answer: (A)

In fire alarm signaling, trouble signals are used to flag faults that could impair the system’s ability to operate. A wiring or power problem fits this category because issues like loss of power, open or shorted wiring, or faulty components can prevent detectors from communicating with the control panel or keep the system from sounding when needed. This type of signal alerts personnel to address conditions that could disable part or all of the system, ensuring the firewall against a real event remains intact. The other signals have different meanings: an alarm signal is driven by a detector or manual pull to indicate an actual fire event and triggers occupants’ notification, a supervisory signal indicates a monitored device or circuit is in a condition that requires attention but may not immediately disable the system (such as a valve or a supervised detector circuit), and a fire signal is the overall indication of fire conditions triggering the system.

In fire alarm signaling, trouble signals are used to flag faults that could impair the system’s ability to operate. A wiring or power problem fits this category because issues like loss of power, open or shorted wiring, or faulty components can prevent detectors from communicating with the control panel or keep the system from sounding when needed. This type of signal alerts personnel to address conditions that could disable part or all of the system, ensuring the firewall against a real event remains intact.

The other signals have different meanings: an alarm signal is driven by a detector or manual pull to indicate an actual fire event and triggers occupants’ notification, a supervisory signal indicates a monitored device or circuit is in a condition that requires attention but may not immediately disable the system (such as a valve or a supervised detector circuit), and a fire signal is the overall indication of fire conditions triggering the system.