Apparatuses and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, data and light signals; electric and electronic contact elements and couplings; electrical power distribution blocks; hybrid and modular plug systems for electrotechnical, electronic, optoelectronic apparatuses and components, modular plugs for power, data, light signals, in particular hybrid plugs for simultaneous connection of power, data, optical waveguides, patch panels, control panels, optical waveguides, liber optic cables, optical fibers, controls, computers, control components, for or with the aforementioned goods, in particular hybrid plugs; power distributer with and without measuring units; electronic power supplies; power distribution and power control machines, apparatuses and parts; power supply cords; loose and ready-made cables; cable reels (cable drums); electric couplings, earthing clamps, earthing spikes, electrical cables, electrical cable harnesses, electrical distributors, all aforementioned goods for mobile or static earthing systems and apparatuses or for potential equalization, for mobile or static systems and apparatuses, stages, event facilities, industry or buildings