Which type of power source is used to ensure continued operation of a fire alarm system during normal power outages?

Which type of power source is used to ensure continued operation of a fire alarm system during normal power outages?

• A. Secondary power supply
• B. Primary power supply
• C. Generator power
• D. Uninterruptible power supply

Answer: (B)

The important idea is that fire alarm systems have a backup energy source that takes over when the normal power fails. This backup is the secondary power supply, typically batteries (and often a UPS) that keep the system running during outages. It provides immediate and continued operation while the primary power from the utility is lost, until the mains are restored or a standby generator can take over. The primary power supply is the regular building power used during normal operation and does not guarantee operation during outages. Generators are standby sources that come online as needed, but the backup energy storage is what ensures continuity right when power goes out.

The important idea is that fire alarm systems have a backup energy source that takes over when the normal power fails. This backup is the secondary power supply, typically batteries (and often a UPS) that keep the system running during outages. It provides immediate and continued operation while the primary power from the utility is lost, until the mains are restored or a standby generator can take over. The primary power supply is the regular building power used during normal operation and does not guarantee operation during outages. Generators are standby sources that come online as needed, but the backup energy storage is what ensures continuity right when power goes out.