Apparatus and instruments for conducting, switching, transforming, regulating or controlling electricity, data and light signals; audio signal distributors; electromechanical and electronic components; patch panels; control panels; electric and electronic contact elements and connectors; plug-in connectors; connectors for data cables and electric cords; electric power distribution blocks; hybrid and modular connector systems for electrotechnical, electronic, optoelectronic and optical apparatus and components, modular connectors for electricity, data, light signals, in particular hybrid connectors for the simultaneous connection of electricity, data and fiber optic cables, patch panels, control panels, optical waveguides, fiber optic cables, fiber optics, controllers, computers, control parts, for or with the aforesaid goods, in particular hybrid plugs; patch panels, control panels for hybrid plugs; power distributors with and without measuring units; electronic power supplies; power distribution and power control machines and devices, and its parts; power supply cable; loose and assembled cables; cable reels (cable drums); application software for electric or electronic measuring devices, apparatus and instruments, electric or electronic measuring devices, apparatus and instruments, electric or electronic monitoring devices, electric couplings, earthing clamps, ground spikes being instruments for conducting electricity, electric cables, electric cable harnesses, electric distributors, all the aforesaid goods for mobile or static grounding systems and devices or for equipotential bonding, for mobile or static systems and devices, stages, event facilities, industry or buildings