Isikrweqe socingo lwe-aluminiyam (i-AWA) yeentambo zocingo olulodwa kunye nesikrweqe socingo lwentsimbi (i-SWA) yeentambo ezininzi zibonelela ngokhuseleko lomatshini olomeleleyo okwenza ezi ntambo ze-11kV zilungele ukungcwatywa ngokuthe ngqo emhlabeni.Ezi ntambo zombane ezixhobileyo ze-MV zixhaphake kakhulu zibonelelwa ngezikhondatha zobhedu kodwa zikwafumaneka nezikhondaktha zealuminiyam xa zicelwa kumgangatho ofanayo.Abaqhubi bezobhedu baxinzelelwe (iKlasi 2) ngelixa abaqhubi be-aluminium bahambelana nomgangatho usebenzisa ulwakhiwo oludibeneyo kunye noluqilima (iKlasi 1).