Which type of fire alarm signal indicates a fault in the system?

Which type of fire alarm signal indicates a fault in the system?

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

Answer: (C)

Fire alarm systems use different signal types to show exactly what’s going on. The signal that indicates a fault in the system is the trouble signal. It flags a condition that could impair operation—things like a power supply problem, a communication line fault, or a malfunctioning device. It tells maintenance that something needs service to keep the system reliable. It’s not an actual fire event (that would be an alarm signal), and it’s not a supervisory condition (which points to a monitored status that needs attention but isn’t a fault). Normal means there are no active alarms or faults.

Fire alarm systems use different signal types to show exactly what’s going on. The signal that indicates a fault in the system is the trouble signal. It flags a condition that could impair operation—things like a power supply problem, a communication line fault, or a malfunctioning device. It tells maintenance that something needs service to keep the system reliable. It’s not an actual fire event (that would be an alarm signal), and it’s not a supervisory condition (which points to a monitored status that needs attention but isn’t a fault). Normal means there are no active alarms or faults.