This publication covers guidelines for selection and installation of general purpose and specialty metallic@ nonmetallic@ and composite outlet boxes such as device boxes@ fixture boxes@ and junction boxes; extension rings; covers; and flush device cover plates. The boxes addressed in these guidelines are intended for use in ordinary@ non-hazardous locations. With the exception of masonry boxes and some multigang boxes and floor boxes@ the boxes addressed in these guidelines are limited to 1650 cm? (100 in?) internal volume.?
OS 3-2007由NEMA - National Electrical Manufacturers Association 发布于 2007-01-01,并于 2008-03-13 实施。
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