An electrical box assembly which includes a horizontally extending support member having a horizontally disposed top wall, a vertically disposed back wall, and a horizontally disposed bottom wall. A front cover is secured to the forward ends of the top and bottom walls. The front cover has one or more electrical receptacle openings formed therein which have electrical receptacles mounted therein. A first side cover closes one end of the support member and a second side cover closes the other end of the support member.