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if the thin wire is use for protection from lightning strike in high tension tower, then tell me that how a thin wire can withstand a high voltage lightning strike.It must be melt when light strike on it before it protect other cable or tower from lightning strike.

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High voltage will not melt a cable.

High current will - but only if applied for long enough.

A lightning strike can result in tens of thousand amps but only for very short duration in the order of 30 µs.

See Lightning on Wikipedia.

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