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Old September 6th 18, 11:46 AM posted to uk.radio.amateur,rec.radio.amateur.antenna
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Default Earth rods, etc

Unearthed the previous fan of plumbers' copper microbore tubes
and associated ground rod to find a corroded and non conductive
mess and raised the question of how to protect underground
junctions from the worst that nature could throw at them?

Firstly, resurrecting a technique from school metalwork lessons
from 53 years ago when brazing things together, dig out the
gas torch, soldering flux***** and solder and connect all together
electrically.

Secondly, to protect the now-relatively-massive joint, smear with
petroleum grease. Was this a good idea, and is there something better?

***** Curious as to whether could be combined with one's radio
interest to nake a flux capacitor to go time travellingg :-)




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Old September 6th 18, 01:59 PM posted to uk.radio.amateur,rec.radio.amateur.antenna
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Default Earth rods, etc

On Thu, 6 Sep 2018 11:46:55 +0100, Gareth's Downstairs Computer
wrote:

Unearthed the previous fan of plumbers' copper microbore tubes
and associated ground rod to find a corroded and non conductive
mess and raised the question of how to protect underground
junctions from the worst that nature could throw at them?

Firstly, resurrecting a technique from school metalwork lessons
from 53 years ago when brazing things together, dig out the
gas torch, soldering flux***** and solder and connect all together
electrically.

Secondly, to protect the now-relatively-massive joint, smear with
petroleum grease. Was this a good idea, and is there something better?

***** Curious as to whether could be combined with one's radio
interest to nake a flux capacitor to go time travellingg :-)


cathodic protection?
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Old September 6th 18, 02:46 PM posted to uk.radio.amateur,rec.radio.amateur.antenna
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Default Earth rods, etc

On 06/09/2018 13:59, Rambo wrote:
On Thu, 6 Sep 2018 11:46:55 +0100, Gareth's Downstairs Computer
wrote:

Unearthed the previous fan of plumbers' copper microbore tubes
and associated ground rod to find a corroded and non conductive
mess and raised the question of how to protect underground
junctions from the worst that nature could throw at them?

Firstly, resurrecting a technique from school metalwork lessons
from 53 years ago when brazing things together, dig out the
gas torch, soldering flux***** and solder and connect all together
electrically.

Secondly, to protect the now-relatively-massive joint, smear with
petroleum grease. Was this a good idea, and is there something better?

***** Curious as to whether could be combined with one's radio
interest to nake a flux capacitor to go time travellingg :-)


cathodic protection?


Interesting because between the house TT earth, a steel rod and the
copper RF earth is now about 0.4 volts, making the ohmmeter go haywire
trying to measure the resistance between them.

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Old September 6th 18, 03:59 PM posted to uk.radio.amateur,rec.radio.amateur.antenna
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Posts: 30
Default Earth rods, etc

In message , Gareth's Downstairs Computer
writes
On 06/09/2018 13:59, Rambo wrote:
On Thu, 6 Sep 2018 11:46:55 +0100, Gareth's Downstairs Computer
wrote:

Unearthed the previous fan of plumbers' copper microbore tubes
and associated ground rod to find a corroded and non conductive
mess and raised the question of how to protect underground
junctions from the worst that nature could throw at them?

Firstly, resurrecting a technique from school metalwork lessons
from 53 years ago when brazing things together, dig out the
gas torch, soldering flux***** and solder and connect all together
electrically.

Secondly, to protect the now-relatively-massive joint, smear with
petroleum grease. Was this a good idea, and is there something better?

***** Curious as to whether could be combined with one's radio
interest to nake a flux capacitor to go time travellingg :-)


cathodic protection?


Interesting because between the house TT earth, a steel rod and the
copper RF earth is now about 0.4 volts, making the ohmmeter go haywire
trying to measure the resistance between them.

One way of assessing the effectiveness of an earth rod is to apply (from
a transformer) an isolated low AC voltage between it and (say) the mains
earth - and measure the current. Obviously, you've got to take into
account the resistance of the connecting wires.
--
Ian
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Old September 6th 18, 04:39 PM posted to uk.radio.amateur,rec.radio.amateur.antenna
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Default Earth rods, etc

On 06/09/2018 13:59, Rambo wrote:
On Thu, 6 Sep 2018 11:46:55 +0100, Gareth's Downstairs Computer
wrote:

Unearthed the previous fan of plumbers' copper microbore tubes
and associated ground rod to find a corroded and non conductive
mess and raised the question of how to protect underground
junctions from the worst that nature could throw at them?

Firstly, resurrecting a technique from school metalwork lessons
from 53 years ago when brazing things together, dig out the
gas torch, soldering flux***** and solder and connect all together
electrically.

Secondly, to protect the now-relatively-massive joint, smear with
petroleum grease. Was this a good idea, and is there something better?

***** Curious as to whether could be combined with one's radio
interest to nake a flux capacitor to go time travellingg :-)


cathodic protection?


Galvanising !
--

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus



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Old September 6th 18, 04:48 PM posted to uk.radio.amateur,rec.radio.amateur.antenna
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Default Earth rods, etc

On 06/09/2018 16:39, Catweazel wrote:
On 06/09/2018 13:59, Rambo wrote:
On Thu, 6 Sep 2018 11:46:55 +0100, Gareth's Downstairs Computer
wrote:

Unearthed the previous fan of plumbers' copper microbore tubes
and associated ground rod to find a corroded and non conductive
mess and raised the question of how to protect underground
junctions from the worst that nature could throw at them?

Firstly, resurrecting a technique from school metalwork lessons
from 53 years ago when brazing things together, dig out the
gas torch, soldering flux***** and solder and connect all together
electrically.

Secondly, to protect the now-relatively-massive joint, smear with
petroleum grease. Was this a good idea, and is there something better?

***** Curious as to whether could be combined with one's radio
interest to nake a flux capacitor to go time travellingg :-)


cathodic protection?


Galvanising !


Can't see how to do that when it's all still in the ground with just
the ends showing :-)

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Old September 6th 18, 05:22 PM posted to uk.radio.amateur,rec.radio.amateur.antenna
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Posts: 1,329
Default Earth rods, etc

On Thu, 6 Sep 2018 14:46:33 +0100, Gareth's Downstairs Computer
wrote:

Interesting because between the house TT earth, a steel rod and the
copper RF earth is now about 0.4 volts, making the ohmmeter go haywire
trying to measure the resistance between them.


That's only true if there's an electrolyte between the copper and
steel. When bonded together, there's no galvanic action or voltage.
If you're using two or more ground rods, all electrical codes specify
that they need to be connected together with some heavy gauge wire.

Ohmmeter? Use a ground resistance tester. Ask any electrician if you
could borrow one:
https://www.google.com/search?q=ground+resistance+tester
https://www.fluke.com/en-us/products/electrical-testing/earth-ground
https://www.fluke.com/en-us/learn/best-practices/electrical-inspection/earth-ground-testing-why-it-matters


--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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Old September 6th 18, 06:14 PM posted to uk.radio.amateur,rec.radio.amateur.antenna
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Posts: 209
Default Earth rods, etc

On 06/09/2018 17:22, Jeff Liebermann wrote:
On Thu, 6 Sep 2018 14:46:33 +0100, Gareth's Downstairs Computer
wrote:

Interesting because between the house TT earth, a steel rod and the
copper RF earth is now about 0.4 volts, making the ohmmeter go haywire
trying to measure the resistance between them.


That's only true if there's an electrolyte between the copper and
steel. When bonded together, there's no galvanic action or voltage.
If you're using two or more ground rods, all electrical codes specify
that they need to be connected together with some heavy gauge wire.


Separate RF earths to reduce noise on RX and protect family members from
RF hazard if touching central heating radiator 1/4 wavelength away.

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Old September 7th 18, 09:06 AM posted to uk.radio.amateur,rec.radio.amateur.antenna
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First recorded activity by RadioBanter: May 2016
Posts: 14
Default Earth rods, etc

On Thu, 6 Sep 2018 18:14:51 +0100
Gareth's Downstairs Computer
wrote:

On 06/09/2018 17:22, Jeff Liebermann wrote:
On Thu, 6 Sep 2018 14:46:33 +0100, Gareth's Downstairs Computer
wrote:

Interesting because between the house TT earth, a steel rod and the
copper RF earth is now about 0.4 volts, making the ohmmeter go
haywire trying to measure the resistance between them.


That's only true if there's an electrolyte between the copper and
steel. When bonded together, there's no galvanic action or voltage.
If you're using two or more ground rods, all electrical codes
specify that they need to be connected together with some heavy
gauge wire.


Separate RF earths to reduce noise on RX and protect family members
from RF hazard if touching central heating radiator 1/4 wavelength
away.


Gareth, get some double glazing, Gareth, that would stop them huddling
around the radiators, Gareth.


Gareth, Thanks, Gareth.


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Old September 7th 18, 09:21 AM posted to uk.radio.amateur,rec.radio.amateur.antenna
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First recorded activity by RadioBanter: May 2017
Posts: 20
Default Earth rods, etc

On 9/7/2018 9:06 AM, Stephen Thomas Troll wrote:
On Thu, 6 Sep 2018 18:14:51 +0100
Gareth's Downstairs Computer
wrote:

On 06/09/2018 17:22, Jeff Liebermann wrote:
On Thu, 6 Sep 2018 14:46:33 +0100, Gareth's Downstairs Computer
wrote:

Interesting because between the house TT earth, a steel rod and the
copper RF earth is now about 0.4 volts, making the ohmmeter go
haywire trying to measure the resistance between them.

That's only true if there's an electrolyte between the copper and
steel. When bonded together, there's no galvanic action or voltage.
If you're using two or more ground rods, all electrical codes
specify that they need to be connected together with some heavy
gauge wire.


Separate RF earths to reduce noise on RX and protect family members
from RF hazard if touching central heating radiator 1/4 wavelength
away.


Gareth, get some double glazing, Gareth, that would stop them huddling
around the radiators, Gareth.


Gareth, Thanks, Gareth.



I had a radiator that rusted through....just thought you would like to
know that ....


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