Patent ID: 8658894

Claim:
A cover assembly for an electrical box that is accessible through a wall opening in a wall member disposed forward of the electrical box, comprising a box cover plate having a central opening without a forward protruding collar around it, said box cover plate being adapted to be mounted on a front side of the electrical box and rearward of the wall member with the central opening in registration with a recess in the electrical box and said wall opening, spring detent devices on the box cover plate at opposite edges of the central opening for engaging an extension ring received in the central opening of the box cover plate, at least one grounding tab extending rearward from an edge of the central opening of the box cover plate, said at least one ground tab being configured for electrical grounding engagement with said extension ring, and a temporary cover for covering the central opening in the box cover plate, said temporary cover comprising a front wall, a side wall extending rearward from the front wall and forming a rim around the periphery of the front wall, a connecting mechanism on the rim for releasably connecting the temporary cover to the box cover plate in a position in which the front wall of the temporary cover is spaced forward from the central opening in the box cover plate, and a release mechanism on the front wall for removing the temporary cover from the box cover plate, said rim of the temporary cover being configured to function as a guide for guiding a cutting tool to cut an opening in the wall member prior to installing an electrical device in the electrical box.