That small wire coming down off the electrical pedestal.
There were lots of good guesses about what it might be for; and they were all that it’s a ground wire. Grounding wire would win by popular vote!
But wait. This is an insulated wire. There isn’t any reason to insulate a grounding wire. A grounding wire is just a bare wire anchored to something in the ground. We have one late-arriving dissenting opinion. It’s a communications wire. If something goes wrong; if one of the relays in the boxes fails, the system needs to alert the operator. There is an alarm or a blinking light, somewhere in a shack or a control room where the operator is. The alarm wouldn’t be wired into the electrical grid, because if the electrical grid failed, then there wouldn’t be anything to power the warning. Time for a recount. I’m going with Henry’s communications wire theory!
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