... Octagon Junction Box available 1.These 4” square boxes with conduit knockouts are installed in walls ... devices.2.Square boxes are used to bring power to a number of electrical devices where ... .Field Names: 4S Box, 1900 box, 1900 electrical box, 1900 junction box, conduit box, J-box ... box, standard 1900 box, square conduit box, 4” square box, 4” square junction box, 4” square outlet box, standard 1900 ...