... in walls or ceilings for lighting fixtures, switches, receptacles or other outlet devices.2.Square boxes are used to bring power to ... box, conduit box, J-box, concentric box, conduit junction box, outlet box, drywall mud box, standard 1900 box, square conduit box ... , 4” square box, 4” square junction box, 4” square outlet box, standard 1900 box, 1900 plenum box, standard 1900 plenum ...