MATERIAL USED IN CONNECTION WITH UNDERFLOOR ELECTRIC-WIRING SYSTEMS CONSISTING OF DUCTS, ELBOWS, [OFFSETS, COUPLINGS, Y FITTINGS,] JUNCTION BOXES, [CONNECTORS,] CONDUIT REDUCERS, [DUCT REDUCERS, ADAPTERS, CONDUIT-OPENING PLUGS, PLUGS, ESCUTCHEONS, PLATES, SADDLE SUPPORTS, SADDLE BRIDGES,] STANDPIPE SERVICE FITTINGS