The National Electrical
Manufacturers Association (NEMA) published NEMA OS 3-2012 Selection and Installation Guidelines for Electrical Outlet
selection and installation of general purpose and specialty metallic,
nonmetallic, and composite outlet boxes such as device boxes, boxes for
luminaires or other products, and junction boxes; extension rings; covers; and
flush-device cover plates are covered in this publication. The boxes addressed
in these guidelines are intended for use in ordinary, non-hazardous locations.
With the exception of masonry boxes and some multi-gang and floor boxes, the
boxes addressed in these guidelines are limited to 1650 cm³ (100 in.³) internal
volume per gang.
OS 3-2012 may be downloaded at no charge or
purchased in hardcopy for $91 by visiting NEMA’s website or
by contacting IHS by phone at 800-854-7179 (within the U.S.) or 303-397-7956 (international), or by visiting global.ihs.com.
NEMA is the association of electrical equipment and medical imaging manufacturers, founded in 1926 and headquartered in Arlington, Virginia. Its member companies manufacture a diverse set of products including power transmission and distribution equipment, lighting systems, factory automation and control systems, and medical diagnostic imaging systems. Worldwide annual sales of NEMA-scope products exceed $120 billion.
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