Signal given by a fire detection and alarm system when a power failure or other system malfunction occurs.

Signal given by a fire detection and alarm system when a power failure or other system malfunction occurs.

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

Answer: (A)

In fire alarm practice, signals fall into three categories: Alarm, Supervisory, and Trouble. A Trouble signal is used to indicate faults in the system—such as a power failure, battery trouble, or wiring fault—that could prevent the system from functioning properly. It warns building personnel that there is a condition needing repair, even though no fire condition is present. So when power is lost or the system detects a malfunction, the correct signal is a Trouble signal. An Alarm signal would imply an actual fire or detected danger triggering evacuation. A Supervisory signal covers monitored conditions that must be corrected to keep supervised devices ready, like a closed sprinkler valve or a fault on a monitored circuit. The term Malfunction Signal isn’t the standard designation used.

In fire alarm practice, signals fall into three categories: Alarm, Supervisory, and Trouble. A Trouble signal is used to indicate faults in the system—such as a power failure, battery trouble, or wiring fault—that could prevent the system from functioning properly. It warns building personnel that there is a condition needing repair, even though no fire condition is present.

So when power is lost or the system detects a malfunction, the correct signal is a Trouble signal. An Alarm signal would imply an actual fire or detected danger triggering evacuation. A Supervisory signal covers monitored conditions that must be corrected to keep supervised devices ready, like a closed sprinkler valve or a fault on a monitored circuit. The term Malfunction Signal isn’t the standard designation used.