Deep Earth Ground

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coulter said:
I suspect you meant 22.4MVA
I suspect the meaning was, "For a fixed power, the higher the voltage the lower the current." But I'm guessing you already knew that.

carl
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22.4 mva is correct. The reason for my post about Ohms law and resistance
was in response to the OP's question about ground resistance. However,
your point about power transmission at high voltage is probably what he meant.
 
Sorry I haven't responded lately I have been very busy lately.

I will research some of the information that some of posted. Thank you.

I am trying to value engineer this out of the project we have been carrying $100,000 for drilling the wells for this grounding system. In the grand scheme of things this is not a huge percentage of the overall project cost ($250 M) but we are over budget and every $100 grand counts.

Thanks for your opinions and information
-Ed
 
ed downey said:
Sorry I haven't responded lately I have been very busy lately.

I will research some of the information that some of posted. Thank you.

I am trying to value engineer this out of the project we have been carrying $100,000 for drilling the wells for this grounding system. In the grand scheme of things this is not a huge percentage of the overall project cost ($250 M) but we are over budget and every $100 grand counts.

Thanks for your opinions and information
-Ed
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My guess is that you could drive a couple of ground rods and get about the same result. You are probably already connected to the building steel and concrete rebar. I can't see anyway that a 250 foot deep hole will improve anything. I bet the water main coming in is over 250 feet long and you are probably connected to it already too. can you bond to the sewer line too?
 
250' is the wrong depth for a good sound system. The crust of the earth is approx 25 miles thick. That rod should penetrate the 25 mile crust in order to reach the secret spot in the "ground" all electricity wants to go to. Just ask any sound system man. Therefore I suggest you convince your contracting authority you need a large enough change order so that you can drive a 25 mile deep rod.
 
250' is the wrong depth for a good sound system.
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Wouldn't installing 528-250' electrodes be a better solution (528 X 250 = 132,000 / 5,280 = 25 miles). Of course this is assuming they are a minimum of 500 feet apart from each other.
 
ed downey said:
Sorry I haven't responded lately I have been very busy lately.

I will research some of the information that some of posted. Thank you.

I am trying to value engineer this out of the project we have been carrying $100,000 for drilling the wells for this grounding system. In the grand scheme of things this is not a huge percentage of the overall project cost ($250 M) but we are over budget and every $100 grand counts.

Thanks for your opinions and information
-Ed
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How about a Lyncole XIT chemical rod for about $1000 backfilled with bentonite?
 
Pierre C Belarge said:
It would be easy.
Take an 8 foot ground rod, cut it in half, throw the rest of the rods back in the truck and go get paid.
Don't forget, put the sawn end of the rod down in the ground...no peaning necessary. ;)
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You say that like you have done it before. :grin: :grin: :grin:


~Matt
 
I see all of these resistance reading but I have a question(maybe I am just dumb but) these resistances are referenced to what? Between what two points are these readings made....rod to rod, rod to water pipe, water pipe to neutral???
 
I actually saw a cable service installer use a piece of 1/4" threaded rod 3 feet long as a ground rod. I made a phone call on that one!!!!
 
Why not dig a 80 foot deep trench , 60 feet wide and fill it with molten copper? Resistance??? What resistance!!
All it takes is one bad ground on a signal wire to the sound system and all of the earth grounds in the world won't help !!!!
 
Depends on what your meaasuring.

Generally most test are 3-point fall of potential test and you are measring the made electrode to earth with two driven test electrodes.

There is also the Clamp on meter.

2-point test which is point to point basically a continuity test.

Then there is a 4-point test which is utilized to measure the average resistance of the dsoil in a given area.

http://www.aemc.com/techinfo/appnotes/Ground_Resistance_Testers/App-Ground-SoilResistivity.pdf

http://www.aemc.com/techinfo/appnotes/Ground_Resistance_Testers/APP-Ground-ComparisonofTesters.pdf
 
MrHandy2005 said:
I actually saw a cable service installer use a piece of 1/4" threaded rod 3 feet long as a ground rod. I made a phone call on that one!!!!
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I'm curious why. I bet the threaded rod driven here in ATL would be a better ground than a 10' copper ground rod driven in Palm Beach County, FL.
 
ive done a job at some customers house and he wanted us to drive ground rods down 80 feet and wanted us to replace romex in his basement because he didnt like the emf waves coming off of it some people are just crazy
 
andinator said:
I'm curious why. I bet the threaded rod driven here in ATL would be a better ground than a 10' copper ground rod driven in Palm Beach County, FL.
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More often than not we hit brackish ground water here between 4-5 feet down.
 
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