Dave is correct, just read a little on CEE or Ufer grounds, perhaps
the idea of exploding bases comes
from a statement about Ufer grounds,
A disadvantage of Ufer grounds is that the moisture in the concrete can
flash into steam during a lightning strike or similar high energy fault
condition. This can crack the surrounding concrete and damage the
building foundation.^
^"Electrical Overstress/Electrostatic Discharge Symposium Volume 22" By
ESD Association, Institute of Electrical and Electronics Engineers"
73 Merv K9FD/KH6
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 <ve...@sasktel.net> 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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