Upon power loss, how long must the secondary power system keep the intrusion system in non-alarm mode?

The requirement that the secondary power system must keep the intrusion detection system in non-alarm mode for a specified period after a power loss is critical for ensuring continuous protection and operational efficiency. Responding effectively to power outages helps to prevent unnecessary alarms, which can lead to alarm fatigue, increased security costs, and potential vulnerabilities during downtime.

The four-hour duration, which is the correct answer, is generally established based on operational standards for intrusion detection systems. This timeframe allows for sufficient time to restore primary power or to implement alternate security measures, thereby reducing the likelihood of false alarms triggered by power fluctuations or outages.

Moreover, a longer period such as four hours balances concerns of maintaining functionality while limiting the potential for security breaches that could occur if the system were to become inoperable too soon after a power loss. This specification is often found in regulatory or industry standards that govern the design and operation of security systems, ensuring that they remain reliable even in adverse conditions.

By understanding this context, it becomes clear why the four-hour requirement is significant for maintaining the integrity and functionality of intrusion detection systems during critical times.