ANSI/NEMA OS 1-2008

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.