Power transfer for protected premises must occur within how many seconds?

Power transfer for protected premises must occur within how many seconds?

• A. 5 seconds
• B. 10 seconds
• C. 20 seconds
• D. 30 seconds

Answer: (B)

The key idea is that a protected-fire alarm system must stay powered during a power outage by switching quickly from the normal supply to backup power. When the main power fails, the system should transfer to its standby source so there’s no gap in operation. Ten seconds is the standard window because it provides a rapid, reliable transition enough to detect the outage and engage the automatic transfer switch without leaving the system unpowered. This keeps initiating devices, supervision, and notification appliances energized, preserving life-safety signaling and monitoring. If the transfer took longer, the system could be without power for a noticeable period, compromising safety and failing to meet code requirements. Therefore, the required transfer time is ten seconds.

The key idea is that a protected-fire alarm system must stay powered during a power outage by switching quickly from the normal supply to backup power. When the main power fails, the system should transfer to its standby source so there’s no gap in operation. Ten seconds is the standard window because it provides a rapid, reliable transition enough to detect the outage and engage the automatic transfer switch without leaving the system unpowered. This keeps initiating devices, supervision, and notification appliances energized, preserving life-safety signaling and monitoring. If the transfer took longer, the system could be without power for a noticeable period, compromising safety and failing to meet code requirements. Therefore, the required transfer time is ten seconds.