US Patent 8378232 Convertible PVC/cast iron electrical floor box

A convertible electrical floor box assembly for installation in a poured concrete floor that includes a non-metallic floor box and a metallic outer box. The non-metallic floor box includes a base plate, a perimetrical side wall with one or more openings for accessing the interior, an open top, a mating structure and an internal support structure for receiving a voltage divider. The metallic outer box includes a base plate, a perimetrical side wall with one or more apertures for accessing the interior, an open top and a mating structure. The non-metallic floor box is adapted for installation in a concrete floor or it can be used together with the metallic outer box as an assembly that is adapted for installation in a concrete floor by inserting the non-metallic floor box in the metallic outer box so that the openings and apertures are aligned.