Imigca emine yokhuseleko lombane kwiintambo zamandla:
I-1, ukukhusela (ukuthintela): intonga yombane, intonga yombane, sebenzisa ikhebula kunye namanye amanyathelo, kungekhona ukujikeleza ukubetha akubethe ngqo ucingo;
I-2, i-insulator flashover (i-blocking): ukuqinisa ukugquma, ukuphucula ...
Funda ngokugqithisileyo