Cable line damage search and their prevention in cable lines up to 20kV. Damage determination in cables up to 20kV. Cable line testing. Electrical device testing up to 20kV. Electric installation and measurement works with voltages up to 20kV. Transformer station modernization with voltage up to 20kV. Project development. Lightning protection installation. Lightning rods. Electrical cable repair. Cable repair. Locate and repair the power cord at home. Underground electricity cable repair. Cable diagnostics. Electrical cable damage prevention.