Workers should always assume that all electrical equipment and lines are what until proven otherwise?

The principle behind the correct choice emphasizes safety in the workplace. Workers should always assume that all electrical equipment and lines are energized until proven otherwise because this mindset helps prevent accidents and injuries. Electrical systems can sometimes retain energy unexpectedly, and assuming that equipment is safe without proper verification can lead to serious consequences, including electrical shocks or electrocutions.

By considering electrical equipment to be energized, workers will take necessary precautions such as proper locking out and tagging out procedures or utilizing appropriate personal protective equipment before they conduct any work or inspections. This approach ensures that safety protocols are consistently followed, significantly reducing the risk of mishaps associated with electrical operations.