NEMA Publishes LE 4-2006 Recessed Lumineries, Ceiling Compatibility

ROSSLYN, Va., August 30, 2006-NEMA has published LE 4-2006, Recessed Luminaires, Ceiling Compatibility. Its purpose is to establish standardized dimensions for recessed luminaires that, if adhered to, will ensure compatibility with conventional generic ceiling suspension systems. Compatibility, as referred to in this standard, means that luminaires will be designed to fit into ceiling systems without causing distortion or misalignment of ceiling members and in such a manner as to ensure their proper support within the ceiling in accordance with the National Electrical Code. Compatibility further means that a luminaire will be placed in support systems in a symmetrical manner without oversized gaps existing between the luminaire and ceiling tiles or ceiling suspension members.

This standard contains definitions, dimensions, and tolerances for recessed luminaires
designed to use fluorescent, high intensity discharge and incandescent light sources.

"LE 4-2006 has been revised to incorporate a new standard ceiling system that was introduced since the previous publication of the document.. By incorporating the dimensions of the latest product introductions from ceiling system manufacturers, we can continue to assure compatability of recessed luminaires and ceiling suspension systems," says Fred Carpenter, chairman of the Luminaire Section.

LE 4-2006 may be purchased for $56.00 by visiting; or by contacting Global Engineering Documents at (800) 854-7179 (within the U.S.), (303) 397-7956 (international), (303) 397-2740 (fax), or on the Internet at

NEMA is the trade association of choice for the electrical manufacturing industry. Founded in 1926 and headquartered near Washington, D.C., its 430 member companies manufacture products used in the generation, transmission and distribution, control, and end-use of electricity. These products are used in utility, medical imaging, industrial, commercial, institutional, and residential applications. Domestic production of electrical products sold worldwide exceeds $120 billion. In addition to its headquarters in Rosslyn, Virginia, NEMA also has offices in Beijing, Sao Paulo, and Mexico City.

Edith Kolodny-Nagy
Standards Editor
(703) 841-3225


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