Izixhobo zokuzinzisa umbane womzi-mveliso zizixhobo ezibalulekileyo ezenzelwe ukugcina inqanaba elingaguquguqukiyo kwiinkqubo zombane, ingakumbi kwimeko yemizi-mveliso apho umgangatho wamandla ubalulekileyo. Ezi zixhobo zidlala indima ebalulekileyo ekuqinisekiseni ukuba izixhobo zisebenza ngokufanelekileyo nangokuthembeka, ekugqibeleni igalelo ekusebenzeni okugudileyo kweenkqubo zemveliso kunye nokunciphisa umngcipheko we-downti