UNI earthing terminal for integrating mounting systems, e.g. of PV systems, into the functional equipotential bonding/functional earthing (conductor color black if necessary) and lightning protection equipotential bonding in accordance with DIN EN 62305-3 (VDE 0185-305-3). The contact plate (intermediate element) made of stainless steel allows different conductor materials (Cu, Al, St/tZn and stainless steel) to be connected to the usual mounting systems, e.g. made of aluminum, without contact corrosion occurring. Version without screw (M8), for combination with other screw systems, with double clamp, e.g. for through-wiring of the profiles.