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Air Sampling-Type Detector: A detector that consists of a piping or tubing distribution network from the detector to the areas being protected. A fan in the detector housing draws air from the protected area back to the detector. The air is analyzed for products of combustion Alarm Signal: A signal indicating an emergency requiring immediate action, such as a signal indicative of a fire.

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Alarm Verification: A feature of some automatic fire detection and alarm systems to reduce unwanted alarms. Smoke detectors must report alarm conditions for a minimum period of time, or confirm alarm conditions within a given time period after being reset, to be accepted as a valid alarm initiating signal.

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Analog Initiating Device: An initiating device that transmits a signal indicating varying degrees of condition, such as smoke obscuration levels. Including but not limited to water flow devices.

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Automatic Extinguishing System Supervision: Devices that respond to abnormal conditions that could affect the proper operation of an automatic sprinkler system or other fire extinguishing system. Including but not limited to control valves, pressure levels, room temperature, etc.

Auxiliary Fire Alarm System: A system connected to a municipal fire alarm system for transmitting an alarm of fire to the public fire service communication center. Fire alarms from an auxiliary system are received at the public fire service communication center on the same equipment and by the same methods as alarms transmitted manually from municipal fire alarm boxes located hei wee wee wee to restable vision streets.

Breakglass Fire Alarm Box: A fire alarm box in which it is necessary to break a special element in order to operate the box. Ceiling: The upper surface of a space, regardless of height.

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Areas with a suspended ceiling would have two ceilings, one visible from the floor and one above the suspended ceiling. Ceiling Height: The height from the continuous floor of a room to the continuous ceiling of a room or space.

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When the top of girders are within 4 in. When the top of the girder is more than 4 in. Central Station: A supervising station that is listed for central station service.

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Central Station Fire Alarm System: A system or group of systems in which the operations of circuits and devices are transmitted automatically to, recorded in, maintained by, and supervised from a listed central station. Class A Circuit: Class A refers este posibil să îmbunătățiți vederea într-un an an arrangement of monitored initiating device, signaling line, or notification appliance circuits, which would permit a single open or ground on the installation wiring of these circuits from causing loss of the systems intended function.

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Class B Circuit: Class B refers to an arrangement of monitored initiating device, signaling line, or notification appliance circuits, which would permit a single open or ground on the installation wiring of these circuits to cause loss of the systems intended function. Combination Detector: A device that either responds to more than one fire phenomenon or employees more than one operating principle to sense one of these phenomenon.

The DACT will seize the connected telephone line, dial a pre-selected telephone number to connect to a DACR, and transmit signals indicating a status change of the initiating device. Display: The visual representation of output data other than printed copy. Evacuation: The withdrawal of occupants from a building.

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Note: Evacuation does not include relocation of occupants within a building. End Of Line Device: A device such as a resistor or diode placed at the end of a class B circuit to maintain supervision.

End Of Line Relay: A device used to supervise power [usually for 4-wire smoke detectors] and installed within or near the last device on an initiating circuit. Evacuation Signal: Distinctive signal intended to be recognized by the occupants as requiring evacuation of the building. Exit Plan: Plan for the emergency evacuation of the premises.

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Fire Alarm Control Unit [Panel]: A system component that receives inputs from automatic and manual fire alarm devices and may supply power to detection devices and transponders or off-premises transmitters. The control unit may also provide transfer of power to the notification hei wee wee wee to restable vision and transfer condition of relays or devices connected to the control unit.

The fire alarm control unit can be a local unit or a master control unit. Fire Rating: The classifications indicating in time [hours] the ability of a structure or component to withstand fire conditions. Fire Safety Functions: Building and fire control functions that are intended to increase the level of life safety for occupants or to control the spread of harmful effects of fire. Flame Detector: A device that detects the infrared, ultraviolet, or visible radiation caused by fire.

Four Wire Smoke Detector: a smoke detector that has two distinct circuits used in its operation.

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The first circuit provides resettable power for the detector and the second circuit monitors the contact on the device. These types of devices are not listed for compatibility. Heat Detector: A device that detects abnormally high temperature or rate of temperature rise. Initiating Device: A system component that originates transmission of a change of state condition, such as a smoke detector, water flow switch, etc.

Initiating Device Circuit: A circuit to which automatic or manual initiating devices are connected.

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This gives the sensing chamber an effective electrical conductance. When smoke particles enter the sensing chamber they decrease the conductance of the air by attaching themselves to the ions, causing a reduction in mobility. When conductance is reduced to less than a predetermined level, the detector responds. Line Type Detector: A device in which detection is continuous along a path.

Examples include projected beam smoke detectors and heat sensitive cable.

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Local Fire Alarm System: A local system sounding an alarm at the protected premises as the result of the operation of hei wee wee wee to restable vision or manual initiating devices. Manual Station [pull station]: A manually operated device used to initiate an alarm signal.

National Fire Protection Association [NFPA]: Administers the development of and ce înseamnă viziunea înaltă codes, standards, and other materials concerning all phases of fire safety.

Non restorable Initiating Device: A device whose sensing element is designed to be destroyed in the process of operation. Notification Appliance: A fire alarm system component such as a bell, horn, speaker, strobe, etc. Obscuration: A reduction in the atmospheric transparency caused by smoke.

Usually expressed in percent per foot. Particles of Combustion: Substances resulting from the chemical process of a fire.

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Photoelectric Smoke Detector: A smoke detector utilizing a light source and a photosensitive sensor so arranged that the rays from the light do not normally shine on the photosensitive sensor. When smoke enters the light path, some of the light reflects off the smoke onto the sensor, causing the detector to respond. Proprietary Fire Alarm System: An installation of fire alarm systems that serve contiguous and non contiguous properties under one ownership from a proprietary supervising station located at the protected property.

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Rate Of Rise Heat Detector: A device which will respond when the temperature rises at a rate exceeding a predetermined amount [usually about 15 degrees per minute]. Remote Station Fire Alarm System: A system installed in accordance with NFPA 72 to transmit alarm, trouble and supervisory from one or more protected premises to a remote location at which appropriate action is taken.

Restoration may be manual or automatic. Signaling Line Circuit: A circuit or path between any combination of circuit interfaces, control units, or transmitters over which multiple system input signals or output signals, or both are carried.

A: Sloping - Peaked Type, Ceilings in which the slope is in two directions from the highest point. Curved or domed ceilings may be considered peaked. B: Sloping - Shed Type, Ceilings in which the high point is at one side with the slope extending toward the opposite side. Solid Joist Construction: Ceilings having solid structural or non structural members projecting down from the ceiling surface a distance of more than 4 in.

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Spot Type Detector: A device whose detecting element is concentrated at a particular location. Examples include certain smoke and heat detectors. Stratification: An effect that occurs when air containing smoke particles or products of combustion is heated by burning material, rises until it reaches a level where there is no longer a temperature difference between it and the surrounding air.

Story: the portion of a building included between the upper surface of a floor and the upper surface of a floor or roof next above.

Technical Specifications

Supervision: The ability to detect a fault condition in the installation wiring which would prevent normal operation of the fire alarm system. Examples include, tamper indication, low air pressure and low building temperature. Thermal Lag: The difference between the operating temperature of a thermal detector and the actual air temperature. Building automation systems over ip design and implementing guide, Fonseca, P N.

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