Potentsiaalselt ohtlikust seisundist lõplikku ohutusse olekusse liikumiseks võib kontrollitav seadmestik või mõõtevahend läbida mitmeid vahepealseid ohutusseisundeid, kusjuures mõnes olukorras on ohutu seisund olemas ainult seni, kuni kontrollitavat seadmestikku kontrollitakse.
In going from a potentially hazardos condition to the final safe state, the EUC may have to go through a number of intermediate safe states. For some situations a safe state exists only so long as the EUC is continuously controlled.
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