![]() ![]() While less common than a steady sound, differing signaling methods were used for the same purpose. In general, no common standard at that time mandated any particular tone, or pattern for audible fire alarm evacuation signals. The majority of audible notification appliances installed prior to 1996 produced a steady sound for evacuation. 70 dB to 100 dB weighted for human hearing (higher decibels, in the 100 to 115 dB range, were common with older electromechanical horns) Ĭoding refers to the pattern or tones a notification appliance sounds in and is controlled either by the panel or by setting jumpers or DIP switches on the notification appliances.520 Hz 80 dB tone used in newer notification devices.Used in many current notification devices. ~3.1 kHz / ~3100 Hz tone (high frequency).Several methods are used and documented in industry specifications published by UL. The primary function of the notification appliance is to alert persons at risk. Most of today's appliances produce sound levels between 70 and 100 decibels at three feet. Initially, all appliances were either electromechanical horns or electric bells, which would later be replaced by electronic sounders. Audible appliances have been in use longer than any other method of notification. A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action. JSTOR ( August 2007) ( Learn how and when to remove this template message)Ī fire alarm notification appliance is an active fire protection component of a fire alarm system.Unsourced material may be challenged and removed.įind sources: "Fire alarm notification appliance" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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