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Lightning Strike

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twospoons:
Back when I was working for an electric fence company we would get lightening hit units back fairly frequently. Some were repairable, the internal protection having done a semi reasonable job. But the ones that rattled ... every single component was a charred black lump, and all the copper was blown off the PCB and deposited inside the plastic case. Quite impressive.
They eventually stopped the warranty on lightening strikes unless a diverter kit was installed on the fence - which consisted of an inductive feed to the fence (75cm of steel spring), a spark gap ( 2 fat bolts 2cm apart) and a 1.5m steel ground spike.

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