Cable trays of a 60 mm height, various widths 100, 200 or 300 mm, made of galvanized sheet metal, length of individual cable tray is 2.0 m. The cable trays are attached to a wall or ceiling with suitable bearing components NKP compliant with installation instructions. Connection of cable trays is carried out with the use of appropriate connection elements, PPKP M8x16 (8x) bolts, and a nut with flange PPKP M8 (8x).