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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => AC Power and Grounding => Topic started by: Frank DeWitt on August 04, 2014, 10:12:11 am

Title: Earthing Pit
Post by: Frank DeWitt on August 04, 2014, 10:12:11 am
I ran across this web site talking about Earthing Pits as opposed to ground rods.  It is interesting.  It reminds me of Mikes inverted bed of nails.

http://www.nairaland.com/1233943/contact-us-electrical-mechanical-plumbing/4
and pictures

(http://www.nairaland.com/attachments/1241802_earth20pit_jpg25f631159918e85179c9342672c1ce30)

(http://www.nairaland.com/attachments/1241801_pit201_jpg413f7ae54f88d43556eeb33b25efd946)
Title: Re: Earthing Pit
Post by: Mike Sokol on August 04, 2014, 10:18:29 am
I ran across this web site talking about Earthing Pits as opposed to ground rods.  It is interesting.  It reminds me of Mikes inverted bed of nails.

Very cool. My carpenter buddy is coming by this week for the bed-o-nails experiment. I have a 2 ft by 2 ft piece of plywood made up with sheet metal on the surface. He's going to use his big framing nail gun to drive in a hundred or so nails while it's on the ground. Then I'll do a fall of potential test during wet and dry weather to see if it's an idea worth pursuing. Yes, I'll take pictures.
Title: Re: Earthing Pit
Post by: frank kayser on August 04, 2014, 11:24:12 am
It would be interesting to know more about the pit - how deep, how long the ground rod(s) are.  What would it be about the soil conditions there that requires that level of detail.  The post says the pit contains "Digging earth pit for earthing of the building using industrial salt, charcoal, copper earth rod,"  What would be the need for charcoal?

frank
Title: Re: Earthing Pit
Post by: Frank DeWitt on August 04, 2014, 11:59:20 am
It would be interesting to know more about the pit - how deep, how long the ground rod(s) are.  What would it be about the soil conditions there that requires that level of detail.  The post says the pit contains "Digging earth pit for earthing of the building using industrial salt, charcoal, copper earth rod,"  What would be the need for charcoal?

frank

I meant to give a different link with more info.  Here it is.
http://electrical-engineering-portal.com/earthing-in-electrical-network-purpose-methods-and-measurement
Title: Re: Earthing Pit
Post by: Jay Barracato on August 04, 2014, 02:27:27 pm
Probably a sacrificial anode. The carbon would be oxidized to carbon dioxide before the copper would be oxidized.

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Title: Re: Earthing Pit
Post by: Frank DeWitt on August 04, 2014, 03:20:25 pm
Probably a sacrificial anode. The carbon would be oxidized to carbon dioxide before the copper would be oxidized.

From the document

Make a mixture of Wood Coal Powder Salt & Sand all in equal part
Wood Coal Powder use as good conductor of electricity, anti corrosive, rust proves for GI Plate for long life.
The purpose of coal and salt is to keep wet the soil permanently.
The salt percolates and coal absorbs water keeping the soil wet.
Care should always be taken by watering the earth pits in summer so that the pit soil will be wet.
Coal is made of carbon which is good conductor minimizing the earth resistant.
Salt use as electrolyte to form conductivity between GI Plate Coal and Earth with humidity.
Sand has used to form porosity to cycle water & humidity around the mixture.

Well, It's August.  I must go water my ground pit.  I don't think that will happen in most cases.
Title: Re: Earthing Pit
Post by: Mike Sokol on August 04, 2014, 03:29:53 pm
Make a mixture of Wood Coal Powder Salt & Sand all in equal parts. Wood Coal Powder use as good conductor of electricity, anti corrosive, rust proves for GI Plate for long life.

Sounds like a spell from Harry Potter movie.  8)
Title: Re: Earthing Pit
Post by: Kevin Graf on August 04, 2014, 04:36:33 pm
From a link in another forum. A section on building Earthing Pits.

"Earthing in electrical network purpose, methods and measurement"
http://electrical-engineering-portal.com/earthing-in-electrical-network-purpose-methods-and-measurement

******************************

All this interest in getting connected with Mother Earth.  Is someone expecting another thunderstorm?
Title: Re: Earthing Pit
Post by: Scott Holtzman on August 05, 2014, 01:16:56 am
Back in "the day" Erico made a smaller version of this chemical ground system http://www.erico.com/products/ChemRod.asp

It was a hollow rod that leached a saline solution to reduce the resistance of the surrounding soil.  AM Radio stations depending on earth as a ground wave radiator.  Having a good earth made a huge difference in your signal.  Going out a full wave length every 30 degrees from the tower with a trench and cadwelded sectional ground rod produced a significant increase in radiation.  I don't remember the megger values we could achieve it was too long ago.

I am sure that a smaller version would be very useful for any facility trying to decrease the noise floor or utilizing an RF cage.

Title: Re: Earthing Pit
Post by: Jerome Malsack on August 05, 2014, 12:17:50 pm
Another article on Grounding by a radio station and tower.   

http://www.copper.org/applications/electrical/pq/casestudy/nebraska.html

http://ewh.ieee.org/r3/nashville/events/2011/Grounding-2011%20color.pdf

This second one has different soil types. 

Title: Re: Earthing Pit
Post by: Jerome Malsack on August 05, 2014, 12:30:15 pm
On another note, my wife showed me a gardening show where they took two clear containers with a hole in the bottom to allow the water to drain.  Placed loose gravel in the bottom of one with dirt above the gravel.  In the second container it was just dirt. 

Adding water to the two.  The first one with the gravel the water did not move down into the gravel very much.  The other one passed the water top to bottom and slowly drained.  Basically they said the water does not move to the gravel because of boundary.  So the moisture will stay above the gravel and not move into that area.   

So in my area with 1 inch top soil with clay under there is little movement of the water and explains why we have standing water in the low spots in the yard.  These puddles will stay 2 or 3 days after a rain.   
Title: Re: Earthing Pit
Post by: Tim Padrick on August 10, 2014, 06:48:50 pm
On another note, my wife showed me a gardening show where they took two clear containers with a hole in the bottom to allow the water to drain.  Placed loose gravel in the bottom of one with dirt above the gravel.  In the second container it was just dirt. 

Adding water to the two.  The first one with the gravel the water did not move down into the gravel very much.  The other one passed the water top to bottom and slowly drained.  Basically they said the water does not move to the gravel because of boundary.  So the moisture will stay above the gravel and not move into that area.   

So in my area with 1 inch top soil with clay under there is little movement of the water and explains why we have standing water in the low spots in the yard.  These puddles will stay 2 or 3 days after a rain.

That seems to argue against the use of the age old Simple Dry Well for removal of standing water.