Testing the safety of high-voltage power lines starts with firing a grounded copper wire onto the line. When it makes contact, the wire instantly vaporizes, creating a controlled short circuit that forces the safety breaker to shut off. After inspection confirms no faults, the breaker automatically reconnects. This process, known as a high-voltage grounding fault test, ensures the line can shut down during emergencies and restore power when conditions are safe. In some cases, workers use drones