Worldwide of electric engineering, making sure the security and performance of electric systems is critical. Various elements and tools are vital to accomplishing this, and amongst them, vertical disconnectors, fuse switch disconnectors, isolator buttons, HV switch disconnectors, busbar systems, surge protective devices (SPDs), and combiner boxes play important functions. These http://tawassol.univ-tebessa.dz/index.php?qa=user&qa_1=dibblegalley32