When is a backup power source required for a fire alarm?

A backup power source is required for fire alarms protecting critical facilities because these locations, such as hospitals, emergency command centers, and other essential infrastructure, must maintain operational capability during a power failure. The uninterrupted functionality of fire alarms in these environments plays a crucial role in ensuring safety and immediate response in emergencies, thereby minimizing risks to life and property.

In contrast, while the other scenarios might involve fire alarms, the need for backup power may not be as crucial. Residential buildings, for instance, typically have different standards and may not require the same level of reliability as critical facilities. Areas with low fire risk do not necessitate stringent backup requirements, as the likelihood of fires may be diminished. Additionally, the installation date of the alarms itself does not dictate the need for backup power, as it is more about the type of facility and its usage. Therefore, the requirement for backup power is specifically tied to the critical nature of the facility being protected.