Historical
ANSI/NEMA OS 1-2008
Sheet-Steel Outlet Boxes, Device Boxes, Covers, and Box Supports (Contains 2010 amendment)
Covers general-purpose metal outlet boxes, device boxes, covers and supports widely used by the consumer. Facilitates the pulling of wires, to protect and facilitate wiring splices and taps, to provide a means of mounting and protecting wiring devices and to provide a connection for rigid conduit, electrical metallic tubing, armored cable, metal-clad cable, nonmetallic sheathed cable, flexible metallic conduit and knob-and-tube wiring systems. (Contains 2010 amendment)
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NEMA: National Electrical Manufacturers Association [nema]