Alarm system
![notifier_small](/images/stories/notifier_small.jpg)
Fundamental configuration:
- Fire alarm control panel: This component, the hub of the system, monitors inputs and system integrity, controls outputs and relays information.
- Primary Power supply: Commonly the non-switched 120 or 240 Volt Alternating Current source supplied from a commercial power utility.
- Secondary (backup) Power supplies: This component, commonly consisting of sealed lead-acid storage batteries or other emergency sources including generators.
- Initiating Devices: This component acts as an input to the fire alarm control unit and are either manually or automatically actuated.
- Notification appliances: This component uses energy supplied from the fire alarm system or other stored energy source usually to evacuate. This is done by means of a flashing light, strobe light, electromechanical horn, speaker, or a combination of these devices.