That isn't even close to being the same condition and only serves to
help perpetuate a stupid myth that refuses to die among the ill
informed. Anyone that doesn't understand that a Ufer ground is
essentially multiple ground rods encased in concrete is indeed ill
informed. And anyone who doesn't understand the mechanisms and
considerations behind a Ufer ground shouldn't be making contributions to
threads like this.
Sorry for the ire displayed by me here, but this stupid topic keeps
surfacing year after year in ham radio circles ... and specifically this
forum ... without the least bit of thoughtful consideration behind it.
I'm tired of our hobby, supposedly a technically based one, being
subject to definitively stated exhortations that are so demonstrably wrong.
Dave AB7E
On 4/17/2017 9:09 PM, Rick Dettinger wrote:
I don’t think its a myth. In the early 1970’s, the power company I worked for
was testing out some hollow reinforced concrete poles. There was considerable
concern by the line workers that the poles might be more dangerous to work on
than wooden poles, in the event of an accident. To check this, we installed
one of the poles in a sub station, and wrapped a 26KV 1200 amp feeder conductor
around the pole. When the station breaker was closed, the pole exploded
dramatically, with a large fireball. The results might have something to do
with moisture content in the concrete. The results convinced us to only use
the poles on transmission lines that wouldn’t be worked hot, like we did with
distribution lines. Of course, the power levels are much higher in lightening
strikes. The conduction paths should similar from encapsulated ground rods in
a tower base to Earth.
73,
Rick K7MW
On Apr 17, 2017, at 8:32 PM, Doug Renwick <[email protected]> wrote:
That myth refuses to die. I have 5 concrete tower bases with ground rods
partially encased and never a worry about an exploding base.
Doug
-----Original Message-----
-NEVER- encase a ground rod in concrete ... especially a tower base.
As a retired 2-way radio tech, I'm aware of two towers that had to be
re-installed because of lightening strikes exploding their concrete bases.
73!
Ken - K0PP
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