20 Non-metal raceways; Chain links of non-metallic materials specifically adapted for use with non-metal raceways; Articulated raceways of plastic, for holding and guiding flexible tubes, electricity conduits and lighting cables, all being non-metal raceways; Energy raceways for guiding hoses and electric cables for use on machines, in particular drilling machines, drilling apparatus and drilling derricks, all in the nature of non-metal raceways; Fastening tabs and clips, being of plastic, both for use in relation to power strips and ducts both in the nature of non-metal fasteners, namely, tabs and clips; Strain relief devices, namely, non-metal cable clamps, clips and ties; Comb bars having cable fasteners of plastic in the nature of non-metal fasteners, namely, bars; Toothed and insulating non-metal clamps of plastic; Connection fittings for electrical protection tubes, in particular plastic holders for mounting; Pipe fasteners, connectors and holders, non- metallic, all being plastic fasteners for holding pipes; Cable fasteners, connectors and holders, non-metallic, all in the nature of non-metal fasteners, connectors and holders, namely, bolts, nails, rivets, screws, clamps, springs, dowels, spacers and spacer sleeves; Non-metal fasteners, namely, bands for cables; Pipe clamps of plastics in the nature of non- metal clamps; Constructions of plastic for holding guide channels in the nature of non-metal guide troughs; Carriers of plastic for the moving ends of articulated raceways, and parts therefor both in the nature of attachment link plates or attachment angles