I would love to understand why HV lines don’t carry the voltage required to break the resistance to earth in very heavy rain. Is rain water pure water with low conductivity? Or are the air gaps too much for the voltage?
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As the others said, between the gaps in the water droplets, the fact that water is actually a bad conductor, really good insulation and proper grounding/systems on each end, the electricity will stay with the path of least resistance which is the aluminum (or copper) inside itself.
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