Electric arc traveling along power line.
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Previously:
https://www.homemadetools.net/forum/...863#post217063
https://www.homemadetools.net/forum/...506#post132064
https://www.homemadetools.net/forum/...733#post152070
https://www.homemadetools.net/forum/...120#post218004
https://www.homemadetools.net/forum/...699#post212868