According to fire alarm industry standards, the battery backup for a system must last for a minimum of how long during an alarm?

The correct answer of 60 minutes reflects the industry standard for battery backup systems in fire alarm installations. This requirement ensures that, in the event of a power failure, the fire alarm system can continue to operate effectively for at least one hour. During this time, the system must be capable of detecting fires, alerting occupants, and notifying emergency services without interruption.

The 60-minute duration is critical because it provides sufficient time for occupants to receive alerts and evacuate safely while also allowing for potential response actions to be taken in the event of a fire. This standard is established to enhance safety protocols and ensure that fire alarm systems maintain functionality during emergencies.

In comparison, shorter durations may not provide adequate assurance of system performance during a critical time when power is lost, which could lead to grave consequences if alarms do not operate as required. Longer durations, while beneficial, may be excessive in most typical commercial and residential settings, and thus are not standardly mandated. Hence, the choice of 60 minutes strikes a balance that aligns with safety expectations and practical system capabilities.