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Under normal operation, high-voltage lines and high-voltage live equipment are often subjected to voltages of several thousand volts, tens of thousands of volts, or even hundreds of thousands of volts. When a person is in close proximity to them, the high voltage generated by high-voltage lines or equipment can break down the air between them and the person, resulting in a discharge that passes through the body. When current flows through the body, it can cause electric burns or even death; this is what is known as electrocution due to high-voltage arcs. To prevent such electric shock accidents, the electricity authorities have established safety distances that must be maintained from high-voltage live lines of different voltage levels; for 10,000 volts, this distance is not less than 1 meter ； 35,000 volts, not less than 2.5 meters ； 110,000 volts, not less than 3 meters ； 220,000 volts, not less than 4 meters. Experienced electricians and power engineering technicians can immediately determine the voltage level of a power line by looking at its installation ； If there is no certainty and the voltage level cannot be determined accurately at the moment, to be on the safe side, it is better to maintain a safety distance corresponding to a higher voltage level while working. High-voltage live equipment is always clearly marked: “High voltage – danger, do not approach!” ”The human body also must maintain a safe distance from them, and this is especially important when the humidity in the surrounding air is high. Modern large-scale power systems are strict organic wholes; if one does not act in accordance with objective laws and ignores safety, an electric shock can result in injury or death to the individual itself, as well as significant damage to the power system.