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Electronic Theory and Principle Discussion of electrical theory, law, etc.

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Old 10-26-2009
davidhammock200 davidhammock200 is offline
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Originally Posted by RagingDragon View Post
The local transmission lines in my area are insulated. I imagine the 500KV lines are uninsulated, because at those voltages insulation light enough for the wires to support wouldn't make a significant difference, while insulation that would make a difference would be *far* too heavy for the wires to support.
Correct. The "big ones" are not insulated.
Yes. One of the last commincations I had with Dave Hammock before he disappeared from the web was how a major brand single +12V rail PSU wasn't shutting down when shorted. We were literally arc welding with the PSU. Hopefully Dave's absense isn't due to the fact that he got over zealous with the welding.
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Old 07-05-2018
gdjacobs gdjacobs is offline
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Originally Posted by davidhammock200 View Post
Correct. The "big ones" are not insulated.
Most primary overhead distribution lines (2400V residential, 12.5kV, and 14.4kV -- all phase to ground) use non-insulated Al, Al-Steel, or all steel wire. That way, the lines are a bit more performant as there's no outer coating to retain heat and line workers can perform the bulk of routine operations live with hot sticks, plus the installed cost for wire is less.

Buried primary cable is, of course, insulated and overhead insulated wire does exist in the form of polyethylene insulated "tree wire" and other specialized application conductors.
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Old 07-05-2018
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ashiekh ashiekh is offline
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Static electricity from a helicopter

A lot of discussion here talks about equalizing the electric potential, but don't forget those lines are AC and so the electric potential alternates.

Even airplanes have static discharge wires (static wicks)
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Last edited by ashiekh; 07-06-2018 at 09:38 AM.
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