Posted by Jon Hagen on December 01, 2011 at 20:51:04 from (69.26.23.96):
In Reply to: Bury the Wires? posted by showcrop on December 01, 2011 at 12:55:17:
In my part of near treeless ND, many power lines are underground. Our power coop says they are not the magic answer once thought to be. An ice storm and strong wind will bring down overhead lines too. They are expensive to bury, they do not cool well underground, so they have wire and insulation breakdown issues. They are very difficult to repair under frozen ground in winter, and some of the wire insulation that was promised to last for 50 years is failing after 20. It's a good idea, but it still has it's faults. The last 2.5 miles of our line are still overhead and give little trouble. Amazing that their are still a few poles from 1949 in there that are still in good condition.
One would think underground lines wiuld be lightning proof, but are not. Lightning will strike the ground and denetrate deep enough to zap the underground cable, then it is time to get the backhoe. Thankfully we do not have winter lightning ;-)
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