Storage batteries for a proprietary burglar alarm system must support the system under maximum intended load for how long?

For a proprietary burglar alarm system, it is essential that the storage batteries are capable of supporting the system under maximum intended load for a specified duration to ensure reliability during power outages. The correct answer indicates that the requirement is for at least 24 hours. This duration is set to guarantee that the system can remain operational during extended periods without external power, providing a critical safety net for security systems.

This requirement also reflects industry standards that ensure system integrity and effectiveness in protecting property. A 24-hour backup allows users to ensure that any potential risk, including power failures, does not compromise the safety features of the alarm system. In contrast, options suggesting shorter durations may not adequately protect against extended outages, which is why they are not aligned with the standard requirements for alarm systems.