Electrical wiring box

Claim 1

A molded plastic electrical wiring box for use with non-metallic sheathed cable comprising: a wall structure defining front-to-rear walls and a back wall therebetween which in combination define a chamber within the box; said wall structure having integrally molded thereinto a generally rectangular knock-out region having two opposite side edges, two opposite ends; two substantially parallel lines of fracture delineating the opposite side edges of said knock-out region; a resilient hinging means connecting each of the opposite ends of said knock-out region to said wall structure; a frangible bridge extending across the knock-out region in a line from one of said lines of fracture to the other, dividing said knock-out region into two flaps, each having an inner and an outer major surface; the major surfaces of said flaps being substantially planar, the plane of each major surface of one flap being spaced from the plane of the corresponding major surface of the second flap, to provide said frangible bridge, and a resilient hinging means joining the end of each flap opposite said frangible web to the surrounding wall structure; whereby an aperture for accommodating non-metallic sheathed cable may be formed in said knock-out region by breaking said frangible bridge and separating one or both of said flaps from said knock-out region along the lines of fracture, and by bending one or both flaps about the resilient hinging means.