Which of the following is not typically used as a fire alarm signal type?

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

Answer: (D)

Fire alarm signaling uses three standard categories to convey the situation and needed action: alarm, supervisory, and trouble. An alarm signal tells occupants there’s a fire condition and they must evacuate or take immediate action. A supervisory signal warns that a component essential to protection—such as a sprinkler valve, a damper, or a Supervisory circuit—needs attention to ensure the system will operate correctly. A trouble signal indicates a fault or loss of function in the system—like wiring problems or power issues—that must be repaired to restore reliable protection. Information, on the other hand, is not a standard fire alarm signal type used to convey life-safety conditions. It might be used for non-emergency messaging in some systems, but it does not indicate a fire-related condition. That’s why information is not typically used as a fire alarm signal type.