How quickly should trouble signals and their restoration to normal be indicated?

The requirement for indicating trouble signals and their restoration to normal is specified within various fire alarm standards and guidelines, particularly those established by the National Fire Protection Association (NFPA) and Underwriters Laboratories (UL). The correct answer indicates that a trouble signal should be displayed within a maximum of 200 seconds. This timeframe ensures that any issues within the fire alarm system, such as communication failures, equipment malfunctions, or other system anomalies, are promptly recognized and addressed.

Timely indication allows for quick response actions to be initiated by the system user or monitoring personnel, minimizing risks to life and property due to undetected malfunctions in the fire alarm system. Adhering to this timeframe promotes better maintenance practices and enhances overall system reliability.

The other options present different timeframes that exceed the acceptable limits set forth by regulations. Choosing a longer duration could delay necessary responses and potentially compromise safety, which is why 200 seconds is established as the correct standard for both alerting individuals to issues and confirming their resolution.