Which of the following is a critical safety procedure when servicing A/C units?

Disconnecting the power supply is a critical safety procedure when servicing A/C units because it ensures that the system is not energized while you are working on it. This precaution significantly reduces the risk of electrical shock, which can be life-threatening. Servicing an A/C unit while the power is still connected can lead to accidents, injuries, or damage to the equipment due to unexpected system startup. By ensuring that the power is disconnected, technicians can work safely and confidently, focusing on repairs or maintenance without the fear of electric hazards.

Other actions, such as wearing gloves, while important for personal protection, do not address the primary risks associated with the electrical components of A/C units. Similarly, releasing refrigerant into the atmosphere is not only unsafe but also illegal in many places due to environmental regulations. Working without gloves increases the risk of injury, particularly from sharp edges or hot components. Therefore, disconnecting the power supply stands out as a fundamental safety measure in A/C servicing.