Abstract: A molded, plastic, hollow electrical connection box is disclosed. To support itself in a wall panel opening, the box includes stop ears formed at each end wall corner which extend perpendicularly to the end wall. Cooperating, mediately located cam segments of trapezoidal shape originally extend diagonally outwardly in planar configuration from the box end walls. After passing the panel during box insertion installation, the cam segments are permanently, rotatably deformed into positions extending generally parallel to the box end walls. In these positions, they permanently and compressively engage the supporting wall panel.

Abstract: A box for receiving electrical outlets, switches, cover plates and the like of standard size and including a portion insertable through an opening in a wall and projecting laterally of the opening when fully assembled for increasing the interior volume of the box.