Flush mount and surface mount sectional electrical box assemblies is provided. In the flush mount electrical box, the male section has a clamping member and a mounting bracket guide. The female section has a clamp guide, a mounting bracket, and a ramp. In the surface mount sectional electrical box assembly the base section fits inside the front section. Wire molding joining the surface mount box with a molding base having an integrally molded combination raceway and a molding cover. A further embodiment provided is a complete electrical box assembly with the clamp members biasing toward the ramps.