A coded supervisory signal must consist of not less than how many rounds of the number transmitted to notify of the restoration to normal?

In the context of fire alarm systems, supervisory signals notify monitoring systems of the status of various devices, including restoration to normal conditions. The coded supervisory signal is essential for effective communication between devices and the main fire alarm control panel.

The correct answer indicates that a coded supervisory signal reflecting restoration to normal must consist of two rounds of the number transmitted to ensure clarity and proper acknowledgment of the signal. This practice is crucial as it reduces the chance of miscommunication. By repeating the coded signal twice, the control panel or monitoring system increases the likelihood that the information is received and understood accurately, thereby reducing the risk of errors related to alarm systems.

Using a minimum of two rounds ensures that the signal is distinguishable in noisy environments, where alarms and other disturbances may interfere with the communication. This redundancy is a standard practice in fire alarm signaling to maintain reliability and safety.

Overall, this emphasis on redundancy and clarity in coded supervisory signals is foundational for effective fire alarm system operations. Adhering to such protocols helps achieve compliance with safety standards and enhances the robustness of an emergency response system.