Final answer:
The Fire Chief is responsible for ensuring proper safety precautions when a fire protection system is out of service.
Step-by-step explanation:
The person responsible for ensuring proper safety precautions are taken when a fire protection system is placed out of service and designated by the owner is the Fire Chief. The Fire Chief is in charge of control and extinguishing fires, protecting life and property, and conducting rescue efforts. They oversee the implementation and maintenance of fire safety measures, including proper procedures when fire protection systems are temporarily unavailable.