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Fire Protection Glossary - N
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Network System. A system in which individual control units form a single network and are typically monitored via a CRT.
NFPA. National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269.
Noise. An electronics term that covers all types of unwanted electrical signals. Noise signals originate from such sources as fluorescent lamps; walkie-talkies; amateur and CB radios; electronic machines being switched on and off; power surges; and others. Electronic equipment must be able to tolerate increasing amounts of electrical interference. The quality of electronic equipment is directly proportional with its ability to reject and otherwise ignore noise.
Noncoded. An audible or visible signal conveying one discrete bit of information.
Noncombustible. A material that, in the form in which it is used and under the conditions anticipated will not aid combustion or add appreciable heat to an ambient fire. Materials, where tested in accordance with ASTM E136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 7500C, and conforming to the criteria contained in Section 7 of the referenced standard shall be considered as noncombustible.
Noncontiguous Property. An owner- or user-protected premises where two or more protected premises, controlled by the same owner or user, are separated by a public thoroughfare, body of water, transportation right-of-way, or property owned by others.
Nonrestorable Initiating Device. A device, which contains a sensing element that, is designed to be destroyed in the process of operation.
Notification Appliance. A fire alarm system component such as a bell, horn, speaker, light, or text display that provides audible, tactile, or visible outputs or any combination thereof.
Audible Notification Appliance. A notification appliance that alerts by the sense of hearing.
Audible Textual Notification Appliance. A notification appliance that conveys a stream of audible information. An example of an audible textual appliance is a speaker that reproduces a voice message.
Olfactory Notification Appliance. A notification appliance that alerts by the sense of smell.
Tactile Notification Appliance. A notification appliance that alerts by the sense of touch or vibration.
Visible Notification Appliance. A notification appliance that alerts by the sense of sight.
Visible Textual Notification Appliance. A notification appliance that conveys a stream of visible information. An example of a visible textural appliance is a monitor that displays an alphanumeric or pictorial message.
Notification Appliance Circuit (NAC). A circuit or path directly connected to a
notification appliance(s).
Notification Zone. An area covered by notification appliances that are activated simultaneously.
Nuisance Alarm. Any alarm caused by mechanical failure, malfunction, improper installation, or lack of proper maintenance, or any alarm activated by a cause that cannot be determined.
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