An electrical box and frame assembly for mounting an electrical component such as a duplex receptacle in a shallow wall cavity. The electrical box assembly includes a box member, a receptacle frame adapted to receive an electrical component, and a trim plate. Rotatable flags on the box member provide ease of installation to a wall in old or new work situations. The box member includes sidewalls of a narrow depth to enable mounting within a shallow wall cavity. The receptacle frame nests substantially within the cavity of the box member and the trim plate secures over the receptacle frame and is mounted to the box member. An outer sidewall on the receptacle frame includes bosses thereon for securing a duplex receptacle in a sideways orientation with respect to the box member and wall cavity thereby enabling the electrical box and frame assembly to be mounted in a shallow wall cavity.