A Coded supervisory signal must consist of how many rounds of the number transmitted to notify of restoration to normal?

The correct answer is based on the established standards for signaling in fire alarm systems. A coded supervisory signal typically requires a specific number of rounds—transmissions of the same number—to indicate a condition such as the restoration to normal. In this case, the standard procedure dictates that the signal must consist of three rounds of the number being transmitted.

This three-round pattern is essential to ensure clarity and reduce the potential for confusion during the monitoring of system status. When a supervisory signal is sent, it confirms not only the presence of a condition but also reinforces the notion that a change has occurred that warrants attention. By transmitting the signal three times, it enhances the reliability and audibility of the notification, which is critical in emergency response scenarios.

Understanding that two rounds (as indicated in the other option) may not suffice to establish certainty or draw adequate attention to the signal is important. Thus, three rounds serve as a robust standard for effective communication within a fire alarm supervisory context.