The sole refrigeration engineer on duty may leave the building’s refrigeration system when it is operating only when?

• A. The system is in standby mode
• B. Relieved by another licensed refrigeration engineer
• C. The building owner approves
• D. A supervisor is present

Answer: (B)

Keeping a running refrigeration system under continuous supervision is essential for safety and compliance. When the only engineer on duty is the sole person responsible for the system, they may depart only if someone else who holds a refrigeration license takes over the duty. This guarantees that a licensed technician continues to monitor, manage any issues, and maintain regulatory compliance while the system remains in operation. Other ideas like switching to standby, owner approval, or a supervisor’s presence do not guarantee that a licensed operator is effectively assuming responsibility over the running equipment, so they don’t meet the required condition.