9 Trunking, conduits and ducting for electric and optical cables and wiring, and joining and connection pieces therefor, including connectors, couplings, T-pieces, end pieces, adaptors, interconnecting pieces, elbows, stop-ends, box-adaptors, reducers, bends and junction boxes; containment boxes specially adapted for electric and optical cables and /or wiring and /or electrical and electronic apparatus, including plugs, sockets, power supplies and chargers; electric and optical cable covers, including those for use on floors and those in the nature of tubing