Ukuququzelela ukufakwa, Iindawo ezivaliweyo ezinobungqina bokudubula zineetheminali zokumisa zangaphakathi nangaphandle. Ezi theminali zilungiselelwe ukukruneka ngeengcingo ezingundoqo zobhedu eziyi-4.0mm2, ukubandakanya iimpawu zokuthintela ukukhulula kunye nomhlwa.
Kwiimeko kusetyenziswa iingcingo zombhobho wentsimbi kunye neebhokisi zokusasaza ezinobungqina boqhushumbo., the use of grounding connectors becomes unnecessary.