A SEALING OF THE POINT FOR STICKING OUT CATHODE RODS, including a sealing around the cathode rode, made of self-solidifying material, and a metallic box with two openings, connected to the cathode shell with openings for passing cathode rods, one of which is for passing the cathode rod, and another one - for supplying self solidifying material, wherein between the sealing and cathode rod there is a layer of material, providing the sliding of cathode rod relatively the sealing.