Question 170Refrigeration & AC - Assistant Engineer

The correct answer is B) secure and tag the electrical circuit. The reasoning behind this is that securing and tagging the electrical circuit is the most effective way to ensure that a refrigeration unit will not start while undergoing repairs. This is a safety protocol to prevent accidental activation, which could be hazardous to the technician working on the unit. Merely making a logbook entry (A), informing people in the area (C), or placing a crow bar in the flywheel (D) would not provide the same level of assurance that the unit will remain deactivated during the repair process.