Xa izixhobo okanye izixhobo zilungiswa, zigcinwa okanye zicocwa, umthombo wamandla onxulumene nesixhobo uyanqunyulwa.Isixhobo okanye isixhobo asiyi kuqalisa.Ngexesha elifanayo, yonke imithombo yamandla (amandla, i-hydraulic, umoya, njl.) ivaliwe.Injongo: ukuqinisekisa ukuba akukho msebenzi okanye umntu onxulumene naye ...
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