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Fire Protection Glossary - L


Labeled. Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction and concerned with product evaluation that maintains periodic inspection of production of labeled equipment or materials and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner.

Lamp Test. Activation of all control unit lights for test purposes.

Last Event Recall. The ability to review the last event in a control unit history.

Leg Facility. The portion of a communications channel that connects not more than one protected premises to a primary or secondary trunk facility. The leg facility includes the portion of the signal transmission circuit from its point of connection with a trunk facility to the point where it is terminated within the protected premises at one or more transponders.

Level Ceilings. Ceilings that are actually level or have a slope of 1 1/2 in./ft (41.7 mm/m) or less.

Lexan®. Single strength glass (which is easily replaced when broken) manufactured by GE plastics used for windows and covers on manual pull stations and on fire alarm cabinet doors.

Light Emitting Diode (LED). A diode that emits visible light when current is applied. LED's are used as single element visible indicators or as multiple-segment displays.

Light Scattering. The action of light reflected and/or refracted off particles of combustion for detection in a photoelectric smoke detector, also known as the "Tyndall Effect".

Limited-Combustible. As applied to a building construction material, other than interior finish, means a material not complying with the definition of noncombustible material that, in the form in which it is used has a potential heat value not exceeding 3500 Btu/lb. (8.14 X 106 J/kg) and complies with one of the following paragraphs, (a) or (b).

(a) Materials having a structural base of noncombustible material with a surface not exceeding a thickness of 1/8 in. (0.3 cm) that has a flame spread rating not greater than 50.

(b) Materials, in the form and thickness used, other than as described in (a), having neither a flame spread rating greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread rating greater than 25 nor evidence of continued progressive combustion.

Materials subject to increase combustibility or flame spread rating beyond the limits herein established through the effects of age, moisture, or other atmospheric condition shall be considered combustible. See NFPA 259, Standard Test Method for Potential Heat of Building Materials, and NFPA 220, Standard on Types of Building Construction.

Line-Type Detector. A device in which detection is continuous along a path. Typical examples are rate-of-rise pneumatic tubing detectors, projected beam smoke detectors, and heat-sensitive cable.

Liquid Crystal Display (LCD). An arrangement of individual segments used to display information. Each segment becomes transparent or opaque as electric current is applied or removed from each segment.

Listed. Equipment, materials, or services included in a list published by an organization acceptable to the authority having jurisdiction and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and whose listing states either that the equipment, material, or service meets identified standards or has been tested and found suitable for a specified purpose. The means for identifying listed equipment may vary for each organization concerned with product evaluation, some of which do not recognize equipment as listed unless it is also labels. The authority having jurisdiction should utilize the system employed by the listing organization to identify a listed product.

Living Area. Any normally occupiable space in a residential occupancy, other than sleeping rooms or rooms that are intended for combination sleeping/living, bathrooms, toilet compartments, kitchens, closets, halls, storage or utility spaces, and similar areas.

Loading Capacity. The maximum number of discrete elements of fire alarm systems permitted to be used in a particular configuration.

Local Control Unit (Panel). A control unit that serves the protected premises or a portion of the protected premises and indicates the alarm via notification appliances inside the protected premises.

Local Energy Master Box. A municipal master box that uses electrical energy from the protected premises to energize its electromagnetic tripping mechanism. See Shunt Master Box.

Local Fire Alarm System. A local system sounding an alarm at the protected premises as a result of the manual operation of a fire alarm box or the operation of protection equipment or systems, such as water flowing in a sprinkler system, the discharge of carbon dioxide, the detection of smoke, or the detection of heat.

Local Supervisory System. A local system arranged to supervise the performance of guard patrols or the operative condition of an automatic sprinkler system or other system used for the protection of life and property against fire.

Location, Damp. Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture. Examples of such locations include partially protected locations under canopies, marquees, roofed open porches, and like locations, and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some cold-storage warehouses.

Location, Dry. A location not normally subject to dampness or wetness. A location classified as dry may be temporarily subject to dampness or wetness, as in the case of a building under construction.

Location, Wet. Installations under ground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather.

Loss of Power. The reduction of available voltage at the load below the point at which equipment can function as designed.

Low Power Radio Transmitter. Any device that communicates with associated control/receiving equipment by low power radio signals.
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