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Glossary Terms -L

Labeled

Equipment or materials to which has been attached a label, symbol or other identifying mark concerned with the product evaluation and by whose labeling the manufacturer indicates compliance with appropriate standards of performance.

Labeled Door

A door that conforms to all of the requirements and procedures of the required labeling authority and has attached the proper identification label. Ratings for labels include: Fire Resistance, Temperature Rise, Sound Transmission and Bullet resistance.

Labeled Frame

A frame that conforms to all of the requirements and procedures of the required labeling authority and is embossed with or has attached the proper identification label. Ratings for labels include: Fire Resistance, Sound Transmission and Bullet Resistance.

Latchbolt

A spring-loaded beveled bolt that projects into a strike, holding the door in a closed position.

Latching Speed

The speed of the door during the last few degrees of closing. Allows latching and prevents slamming.

Lead Lined

or Lead Wrapped - Pertains to a lockset, door or frame that has a lining or covering of lead to prevent the passage of radiation. Generally used in hospital applications.

LED

(Light Emitting Diode) – A solid state device, or diode, that gives off virtually heatless colored light when electric current is passed through.

Levels of Keying

The divisions of a master key system into hierarchies of access.

Lever Handle

A flat or bar-like grip that is used to actuate a locking or latching mechanism or simply as a decorative pull.

Line Drop

A voltage loss occurring between two points in a circuit. Such loss is due to resistance or, usually, too small conductor.

Lip of a Strike

The part of a lock strike that projects from the frame face and which that latchbolt rides. The measured lip of strike is very important when applied trim is used on the frame, creating a deeper reveal for a door opening.

Listed

Equipment or materials which is included in a published list concerned with the product evaluation and whose listing states that either the equipment or materials meets appropriate designated standards or has been tested and found suitable for a specified purpose.

Load

A device which uses or consumes electrical power. Example: Electric Strike.

Lock Case

The box type shell containing the lock mechanism. Term usually used in conjunction with a mortise lock.

Lock Stile

(of a door) - The stile of a door to which the lock or latching devices are applied. (Terminology is usually applied to wood doors)

Lockdown

An emergency protocol that will lock some or all of the doors in a building or campus, either to protect occupants from an external threat or to prevent people from entering or exiting certain areas of the building.