Under maximum quiescent load, the secondary power supply should operate for a minimum of how long?

Under maximum quiescent load, the secondary power supply should operate for a minimum of how long?

• A. Two hours
• B. Six hours
• C. Four hours
• D. Eight hours

Answer: (C)

Backup power duration under the highest standby draw is what this item is addressing. When the main power fails, the secondary power supply must keep the system running even at its maximum quiescent load, so the panel can continue monitoring, reporting, and waiting for power recovery. Four hours is the minimum because it provides a practical window to handle typical outages while keeping backup battery size reasonable. Two hours would be too short to cover common outages, while six or eight hours go beyond the minimum required for this scenario.

Backup power duration under the highest standby draw is what this item is addressing. When the main power fails, the secondary power supply must keep the system running even at its maximum quiescent load, so the panel can continue monitoring, reporting, and waiting for power recovery. Four hours is the minimum because it provides a practical window to handle typical outages while keeping backup battery size reasonable. Two hours would be too short to cover common outages, while six or eight hours go beyond the minimum required for this scenario.