Glossary

The following is a compilation of building energy-code related terms and acronyms used on the Building Energy Codes website and throughout the building construction industry.

Select a letter to navigate through the glossary:

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Labeled

Devices, equipment, appliances, assemblies, or materials to which have been affixed a label, seal, symbol, or other identifying mark of a nationally recognized testing laboratory, inspection agency, or other organization concerned with product evaluation that maintains periodic inspection of the production of the above-labeled items and by whose label the manufacturer attests to compliance with applicable nationally recognized standards.

Lamp

A generic term for a man-made light source, often called a bulb or tube.

lb

Pound.

Lighting Power Density (LPD)

The maximum lighting power per unit area of a building classification or space function.

Lighting System

A group of luminaires circuited or controlled to perform a specific function.

Liquid-Immersed Transformer

A transformer in which the core and coils are immersed in an insulating liquid.

Listed

Equipment, appliances, assemblies, or materials included in a list published by a nationally recognized testing laboratory, inspection agency, or other organization concerned with product evaluation that maintains periodic inspection of production of listed equipment, appliances, assemblies, or material, and whose listing states either that the equipment, appliances, assemblies, or material meets nationally recognized standards or has been tested and found suitable for use in a specified manner.

Longitudinal Seam

A duct seam that is parallel to the direction of air flow.

Low Voltage Lighting

Lighting equipment that is powered through a transformer, such as a cable conductor, a rail conductor, or track lighting.

Low-Rise Residential

Single-family houses, multi-family structures with three stories or fewer above grade and manufactured houses (modular and mobile homes).

Luminaire

A complete lighting unit consisting of a lamp or lamps, along with the parts designed to distribute the light, hold the lamps, and connect the lamps to a power source. Also called a fixture.