Patent ID: 8253016

Claim:
A system of electrical boxes comprising: first and second similarly sized electrical boxes each comprising: at least four sides extending from a bottom to an open top and at least two box mounting screw apertures adjacent to each of at least two sides, each box mounting screw aperture comprising an opening extending toward the open top of the first electrical box; a first pattern of at least one interfering structure on an external surface of at least one of the at least four sides of the electrical box adjacent to the bottom of the first electrical box; and a second pattern of at least one interfering structure on an internal surface of at least one of the at least four sides of the electrical box adjacent to the open top of the first electrical box; wherein the first and second patterns of interfering structures of the first electrical boxes interfere with corresponding second and first patterns of interfering structures of other first electrical boxes to prevent nesting of two first electrical boxes, but do not interfere with second and first patterns of interfering structures of the second electrical boxes to permit nesting of first electrical boxes within second electrical boxes and second electrical boxes within first electrical boxes.