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The required minimum clearance when operating a crane near power lines rated at 100kV is indeed 10 feet with encroachment precautions. This standard is based on safety regulations designed to protect workers from electrical hazards associated with high-voltage lines. High-voltage power lines can produce a substantial electrical field, and maintaining a distance reduces the risk of accidental contact or electrical arcs.

The encroachment precautions refer to additional safety measures that must be taken when working close to these power lines, indicating that while 10 feet is the minimum, special attention and safety protocols are necessary in these scenarios. These precautions can include using insulating devices or maintaining visual contact with the power lines at all times, ensuring operational safety while working in proximity to electrical hazards.

Understanding the significance of maintaining this distance is crucial for preventing serious accidents, making it imperative for signal persons and crane operators to adhere to these regulations diligently. This knowledge is essential for creating a safe work environment when operating cranes near high-voltage power lines.