Conduit wiring system. Installed in ceilings or walls for lighting fixtures, switches or receptacles. Used where multiple conductor runs are split into two or more directions to bring power to a number of electrical devices. Drawn construction and raisedgrounding provision for surface mount applications in ceilings or walls for lighting fixtures or receptacles. Eight 1/2 in and four 3/4 in conduit knockouts (sides). Two 1/2 in and two 3/4 in conduit knockouts (bottoms). 4 in square x 1-1/2 in deep - 21.0 cubic inches. Acceptable for use in 2-hour rated fire walls. UL Listed. UPC bar code.