Explain why backfeeding a distribution transformer can be dangerous, even when de-energized, and what specific safety measures should be taken.

Backfeeding a distribution transformer means applying voltage to the secondary (low-voltage) side, which causes voltage to appear on the primary (high-voltage) side. Even when the primary side is considered de-energized, backfeeding poses significant dangers. The primary danger is that the high-voltage side becomes energized, creating a lethal hazard for anyone working on what they believe to be a de-energized circuit. The voltage transformation ratio remains the same, so....