Electrical connection components, in particular connectors, plugs, bushings, contacts and terminals for printed circuit boards, installation material for making electrical connections, in particular connection components consisting of electrical connectors, plugs, sockets, bushings, terminals, adapters, couplings, junction boxes, sockets, distribution boxes, patch panels, distribution cables, patch cables, cables, cable sets consisting of cables and connectors, pre-installed connection channels for data and telecommunications networks; installation material for making optical connections, in particular connection components consisting of optical fibres, optical fibre filaments, optical fibre cords, optical fibre cables, optical connectors, plugs, sockets, bushings, adapters, couplings, junction boxes, plug sockets, distribution panels, patch panels, distribution cables, patch cords, optical fibre cable sets consisting of optical fibre cables and connectors, pre-installed optical fibre connection ducts for data and telecommunication networks; testing and measuring instruments, in particular for electrical networks, for optical networks, for data transmission and for telecommunications; electrical, electronic and optical components and systems made therefrom, consisting of electrical connectors, plugs, terminals, adapters, couplings, distribution boxes, distribution boards, patch panels, jumper cables, cables, optical fibres, optical fibre filaments, optical fibre cables, fibre optical cables, optical connectors, optical plugs, optical adapters, fiber optic couplers, optical distribution panels, optical patch panels, optical distribution cables, optical patch cables for managing connections on distribution panels or patch panels; electrical and electronic assemblies and devices, namely, analogue and digital input and output modules, timers, monitoring assemblies consisting of monitoring modules and monitoring software, electrical power supplies consisting of ac and dc power supplies, control devices, sensors and systems manufactured therefrom, consisting of analogue and digital input and output modules, timers, monitoring assemblies consisting of monitoring modules and monitoring software, electrical power supplies consisting of ac and dc power supplies, wireless or computer network repeaters, gateway routers and hubs; electronic equipment for measuring, recording, storing, transmitting and evaluating energy consumption or environmental information; electrical and electronic protection and switching devices, in particular relays, coupling modules, fuses, overvoltage protection modules and switches