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Old 04-14-2021, 11:05 PM   #5
ghost
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City: Anacortes
Join Date: Nov 2012
Posts: 1,189
It just needs to be exposed to moisture. It will wick up the cable and oxidize the wire many feet up. That’s why we use tinned wire and sealed terminals.

Unusual after that many years with bare copper, not really. Typically the ends are the worst, but once it starts, it travels. In exterior exposed wires, I’d say it’s very common.
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