Worldwide of electric design, guaranteeing the safety and security and efficiency of electric systems is critical. Numerous components and devices are necessary to attaining this, and among them, vertical disconnectors, fuse switch disconnectors, isolator buttons, HV switch disconnectors, busbar systems, surge protective devices (SPDs), and combiner boxes play essential duties. http://tawassol.univ-tebessa.dz/index.php?qa=user&qa_1=dibblegalley32