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fire alarm system
A fire alarm system is number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are present. These alarms may be activated from smoke detectors, and heat detectors. Alarms can be either motorised bells or wall mountable sounders or horns. They can also be speaker strobes which sound an alarm, followed by a voice evacuation message which usually state in the lines of "Attention, Attention. A fire emergency has been reported. Please leave the building via the nearest exit. DO NOT use elevators!" They may also be activated via Manual fire alarm activation devices such as manual call points or pull stations. Fire alarm sounders can be set to certain frequencies and different tones including low, medium and high depending on the country and manufacturer of the device. Most fire alarm systems in Europe sound like a siren with alternating frequencies. Fire alarm sounders in the Untied States can be either continuous or set to different codes such as Code 3. Fire alarm warning devices can also be set to different volume levels. Smaller buildings may have the alarm set to a lower volume and larger buildings may have alarms set to a higher level.
== Design ==
After the fire protection goals are established – usually by referencing the minimum levels of protection mandated by the appropriate model building code, insurance agencies, and other authorities – the fire alarm designer undertakes to detail specific components, arrangements, and interfaces necessary to accomplish these goals. Equipment specifically manufactured for these purposes is selected and standardized installation methods are anticipated during the design. In the United States, NFPA 72, ''The National Fire Alarm Code'' is an established and widely used installation standard. In Canada the ULC is the standard for the fire system. The equivalent standard in the United Kingdom is BS 5839 Part 1.
EN 54 is a mandatory standard for Fire detection and fire alarm systems in the European Union, aiming to establish harmonised technical standards against which products in the field should be benchmarked and certified by a qualified testing house known as a Notified Body.
Every product for fire alarm systems must achieve the standards laid out in EN 54 in order to properly carry a CE mark, which is in turn required if the product is be delivered and installed in any country of the EU. It is a standard widely used around the world.〔(CEN – European Committee for Standardization :: Standards ). Cen.eu. Retrieved on 2013-02-02.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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