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#17248 - 11/22/02 02:34 PM Grounding  
rowdyrudy  Offline
Joined: Nov 2002
Posts: 169
Mascoutah, IL USA
Has anyone experienced this? Quite a few years ago, I was on a microwave relay station/tower site. The site was on nearly solid rock. The specs required that all metal objects were to be bonded to the grounding grid, even the copper screening on the outdoor toilet. Requirements were 25 ohms or less. Unable to obtain this, the EC got some charcoal brickets and crushed them into a powder and poured the powder into the holes where the ground rods were placed in the rock. The system then indicated no resistance over 10 ohms. I still don't understand it.

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#17249 - 11/22/02 03:29 PM Re: Grounding  
SvenNYC  Offline
Joined: Aug 2002
Posts: 1,691
New York City
Carbon (main ingredient in charcoal briquettes) is a conductor, which is why it's used in resistors, potentiometers, etc.

Maybe it reduced the electrical resistance of the ground he was sticking the rods into.

Just a thought.

#17250 - 11/22/02 09:18 PM Re: Grounding  
Scott35  Offline

Broom Pusher and
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
Kind of a "MacGiver" approach to chemical soil treatments!

Scott s.e.t.

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#17251 - 11/22/02 09:28 PM Re: Grounding  
The Watt Doctor  Offline
Joined: Dec 2001
Posts: 435
Mont Belvieu, TX
Would you elaborate on chemical soil treatments? In all my years, I have never had to treat the soil on any job I've been on. We just have good soil down here.

Not a MacGiver fan,

The Watt Doctor
Altura Cogen
Channelview, TX

#17252 - 11/23/02 12:23 AM Re: Grounding  
sparky66wv  Offline
Joined: Nov 2000
Posts: 2,236
West Virginia
Coal mines here have to run many hundreds of feet of large copper pipe to obtain 25 Ohms.

Tom could give you better actual numbers than me.

Alas, grounding is a major headache for me and I'm always interested in different methods...

Although not required to obtain 25 Ohms in the work I do (minimum 2 rods regardless by PoCo) I would like the rods I labor so hard to install actually do something!

Tell me more!

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#17253 - 11/23/02 05:57 AM Re: Grounding  
sparky  Offline
Joined: Oct 2000
Posts: 5,311
the 'chemical' G-rods posted here a while back looked interesting. I wonder how often one would need to maintain the bentonite?

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#17254 - 11/25/02 10:05 PM Re: Grounding  
The Watt Doctor  Offline
Joined: Dec 2001
Posts: 435
Mont Belvieu, TX
Thanks Spark,


The Watt Doctor
Altura Cogen
Channelview, TX

#17255 - 11/26/02 01:29 AM Re: Grounding  
hurk27  Offline
Joined: May 2002
Posts: 68
Portage, Indiana
I made mine out of a 5 gal bucket the 10' copper rod was driven 2' below grade then the bucket was drilled with holes in the bottom and in the lid. probely not the best way but I used 3 round salt blocks the ones we use for horses or cows just put them in the bucket and let the rain do the rest

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