Ukukhiya ikhebula okulungisekayo ubude belokhi yekhebula kungalungiswa kuye ngokwendawo yenkundla ukuze ihlukaniswe isikhashana phakathi nokulungiswa nokulungiswa noma ukukhiya isikhathi eside okungenamkhawulo kwama-valve nama-breaker circuit.Ngesikhathi sokulungiswa nokulungiswa, kungasetshenziswa ama-padlock amane, ngalinye lingelezisebenzi ezinakekelayo ezihlukene.Kuphela ngemva kokuba bonke abasebenzi sebewuqedile umsebenzi wabo futhi bakhiphe izingidi zabo zomuntu siqu lapho izingidi zekhebula zingakhishwa futhi nokusebenza kwamavalvu (noma ukushintshwa kwe-circuit breaker) kuzobuyiselwa.