The safe approach distance, often referred to as the "exclusion zone" or "no-go zone," is the minimum required clearance between a person, equipment, or materials and a live power line. This distance is critical because electricity can arc or "jump" through the air, even without direct contact, causing serious injury or death. This distance varies significantly based on the voltage of the power line. For example, national and regional safety standards (like those from OSHA in the US) specify a minimum clearance of at least 10 feet for lines up to 50 kV, with larger distances required for higher voltages. Always assume a power line is live and adhere to the specified clearance distances as provided by the local utility or regulatory body.