If primary power fails in a fire alarm system, what is the requirement regarding signal loss or delay?

The requirement regarding signal loss or delay in a fire alarm system when primary power fails is that no signals shall be lost or delayed by more than 10 seconds. This stipulation ensures that in the event of a power failure, the system remains responsive and can promptly alert occupants of a potential fire condition.

Maintaining quick communication during emergencies is critical for safety. A maximum delay of 10 seconds allows for a balance between the time needed to switch to backup power sources and ensuring timely alerts. The requirement aims to minimize the risk of delays in notifying individuals and responding personnel, which can be crucial for life safety.

This standard is in place to ensure that fire alarm systems can reliably function even under adverse conditions, as prolonged delays or loss of signals could lead to dangerous situations. It also aligns with safety regulations that prioritize prompt detection and notification in fire protection systems.