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A fire alarm system is a set of electronic equipment working together to detect and alert people through visual and audio appliances when smoke or fire are present. These alarms may be activated from smoke detectors, heat detectors, water flow sensors, which are automatic or from a manual fire alarm pull station.  EN 54 is a mandatory standard in the European Union for fire detection and fire alarm systems. Every product for fire alarm systems must have a CE mark with an EN 54 standard to be delivered and installed in any country of the EU, even if It is a standard widely used around the world.
The devices of automatic revelation of smokes and fires are the different elements of the plant, they are set in various places, through which is possible notice the presence of a fire. In the great majority of the cases it deals with electronic devices that have in common the ability to communicate, even if with different formalities, with the centrals of the alarm fire. Devices for manual fire alarm activation, are installed to be readily located (as a rule, near the exits), identified, and operated.
Notification Appliances utilize audible, visible, tactile or textual stimuli to alert the occupants of the need to evacuate or take action in the event of fire or other emergency.
Some fire alarm systems utilize emergency voice alarm communication systems (EVACS) to provide pre-recorded and manual voice messages. Voice Alarm systems are typically used in high-rise buildings, arenas and other large "defend-in-place" occupancies such as Hospitals and Detention where total evacuation is difficult to achieve.
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