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Reliability of underground power lines? - Page 7

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Posted by EXT on July 30, 2010, 2:24 pm
 



Around here often the underground installation companies install natural gas
pipes in a unique way. To install natural gas lines they use  an air powered
"torpedo"  which will drag a cable underground over about 50 to 100 feet at
a time. This cable is used to pull a cone to enlarge the tunnel and then
drag a plastic gas distribution pipe without tearing up the entire route
allowing them to go under trees. I am sure the same technology can be used
to pull wires or conduit for wires.


Posted by Michael B on August 1, 2010, 12:18 am
 



This is one of the more exhaustive studies.
www.scc.virginia.gov/comm/reports/report_hjr153.pdf

Posted by N9WOS on August 1, 2010, 1:44 am
 

This is one of the more exhaustive studies.
www.scc.virginia.gov/comm/reports/report_hjr153.pdf



Why doesn't that statement instill confidence? What about all that cable
that is already in the ground? The "experts" were surprised by the much
higher than expected failure rate of first gen cables.  But we should
believe them now? With all the worthless expert "opinion" and "consensus"
that we have seen over the years, you will just have to put me on the
skeptic side of things.

Put then in the ground, cross your fingers, and pray...


I have news for them.  When you have direct burial, or conduit buried cable,
you still have to keep large growth/deep rooted trees from establishing
themselves. The roots will disturb the underground line. When a tree blows
over, if it's roots are around the line, then it will be ripped out with the
tree. A conduit won't help any.



Posted by Josepi on August 1, 2010, 2:05 am
 

Our 14Kv cables are installed in duct banks with concrete around them for
major runs down streets. backyards get direct burial cables and this could
be a problem.



I have news for them.  When you have direct burial, or conduit buried cable,
you still have to keep large growth/deep rooted trees from establishing
themselves. The roots will disturb the underground line. When a tree blows
over, if it's roots are around the line, then it will be ripped out with the
tree. A conduit won't help any.




Posted by hallerb@aol.com on August 2, 2010, 8:01 pm
 


when you have overhead cables trees fall bringing down lines, winds
damage lines, vehicles talke out poles, and perhaps worst of all many
of these bad days occur in poor weather conditions.......

I have watched from too close by a tree trimmer down a 14K line,
taking out power for miles. the tree he was trimming was mine:( and
after this cut I was going to help direct traffic. I would of been
killed the line fell on the street where I would of been standing.

the arcing line left a carbon trail on the street tll it was repaved 5
or 6 years later.

from just a safety persperctive underground lines are safer


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