Electronic Earth Pit

The earth is not made out of electronics.

However, were it so, it would be 6 feet deep, 10 feet wide, and 12 feet, 4 inches long.

By electronic earth pit I meant construction details of earthpit meant for proper grounding of complex electronic systems such as DCS.

You should refer operational manual of the machinery for this , they usually give earth details regarding -gnd resistance(voltage), were digging pit is concerned , 2feet X 2feet X 3.5-7 feet deep depending upon dampness and soil conductivity in your region, thick wide surface area conductor(copper) mess/plate surrounded by dampness and conductivity regulator like salts , foam wastes , charcoal of wood , crushed bricks to say few. you connect thick wire with fastner and to this conductor and other end to your electric outlet gnd, you should be perticular if you have power backup through battery , type of inverter used on/off-line .

Dear Sir/madam,

I would require the procedure for earth pit contruction details and if it varies according to regions like nepal where I am facing heavy earthing problem in few of the Cinema theatre.

Like would also require the measure quantity of component required to prepare the pit.

regards

Sudhir Shetty

UFO

Mr. Sudhir Shetty,

1st of all u should make a pit of around 10 mt. inside the earth which should placed near(means outside) ur home/ construction site.

N connect the G.I.Strip to this earth pit which is coming from ur equipment/system to whom u want protect.

Following this process u can safe ur system.bUT Earthing Resistance should be less than 1 ohms from good engineering point of view.

One more think according to requirement our component quintity varries (Salt.Water) FOR dry area we use more quantity(salty water) but for wet we use low.

Dear friend,

Please try for some special earthing electrode like Pipe In Cage type

Please visit following site

http://picearthingtech.com/

Regards

Raju

Earth Pit Construction details visit on the following web link

http://cid-f8598568e1273d16.spaces.live.com/blog/cns!F8598568E1273D16!329.entry

I have used Copper strip brazed to copper Plate earth electrode in all case of DCS/PLC earthing system as it was in design. But now in one design I find 40mm MS ROD has been considered for Electronic earthing. Is MS Rod allowable for PLC?DCS earthing?

Is there any clear guideline available in IEEE or any other standard for MOC of electronic earthing? What is the dimension of Electrode Plate? How to calculate the earth electrode resistance of earthing plate?

Anyone having clear idea of standard to be followed for PLC?DCS earthing please share...

Thanks

Is this a question about the WEEE directive, intended to reduce the dumping of electronic materials in landfills?

http://en.wikipedia.org/wiki/WEEE_directive

By electronic earth pit I meant construction details of earthpit meant for proper grounding of complex electronic systems such as DCS

A technique that is sometimes applied is to separate the earthing arrangements for power and for instruments onto two separate earthing systems. Any risk of noise on the power earth is then removed from the instument earth. A DCS, being an appliance, will be connected to the power earth.

Even I have faced this problem. I have come across communication failures between PLC and computers etc.

On enquiry I was told that a electrical gorund is as good as that. But the ground pit for data earthing must be at least 300 m away from an electrical earth pit.

Also earth and ground potential must be 0 volts. Very hard to acheive. I have acheived 2 volts by using copper bars in the earth pit.

You may also try this.

Yes it is a problem some times when you have only one ground loop for both electrical and electronics/instrumentation ie Analog signals etc in DCS. As suggested by the guest you should have the grounds slightly far from each other. You may also use delta format by hooking 3 pits using copper conductors with ground mats so that the rods can reach sufficient dampness for inst ground ( depending on amount of network and inst). Isolate your inst system completely of electrical ground and the grounding has to be as per the manufacturer of your electronics, like allen bradley and other PLC & DCS manufacturers lay down various standards for grounding and wiring. Electrical noise can give you all sorts of problems( cross talk, communication failure, and also aero inductive problems)

I've had good luck with 3m copper rods ~10mm in diameter driven into the earth 3m apart. The soil is damp here and I've got the rods located in such a way that runoff from the roof contributes to the ground water around the rods. The rods are brought back to the dedicated ground with 2 gauge 9 strand twisted copper.

If there is a manufacturer of RF equipment in your area I'd bet they know how to set up a good ground in the local earth.

Hi,

We design a big building, which have 17 generators, 20 transformers and many panel boards. Please advice us about earth pits as follow questions:

1) How much distant require between two pits?

2) How should far earth pits from building?

3) May I use one pit for different generators

4) Can I design group of earth pits and connect togather for use of different equipments?

5) What is the building code for earth system?

6) Is required separate pit for equipment body, Phase etc?

I will appreciate for your soon reply. Thank you

Syed Rizvi

Hi

Nobody give the reply for this mail. Should someone give the reply and solve the problem

Generalized answers to your querry,

Firstof all what system you are desiginging, TN,TT or IT. The below replies are for TT system.

1) The pits should be as possible as nearer to equipment to be grounded. If forming 3 pits grid i.e. to lower the ER, usually the distance varies from 3 to 5 feet for traingular side.

2) Not excat idea, but I hope it dosen't matter

3) If Earth fault protection devices is different for different generators, then NO, if combined then you can. But it will be nice if different Gensets have individual neutral pits.

4) Yes, but should be seperated from Neutral grounding, if EF protection used for euipments also.

5) BIS -6043,i hope so.

6) For TN system yes, But for TT no.

Dear ,

For your kind of information . i want to explain you that In electrical earth pits are 4.5 m Deep.

EARTH PIT for Electrical & Electronic Equipments Visit http://www.sehlindia.com/earthpit/ and protect your costly Electrical/Electronic equipment from hazard power supply, high voltage spikes, high RF charged and thunder electricity etc. Earth Pit is essential for electronic equipment like Computer, PLC Based Industrial Control Systems, and Micro Controllers etc.

CONSTRUCTION OF EARTH PIT AS PER INDIAN ELECTRICITY BOARD

1. Excavation on earth for a normal Earth Pit size is 1.5M X 1.5M X 10M

2. Use 500 mm X 500 mm X 10 mm GI Plate (Plate may be use as big as possible to contact more and more area of Earth for low resistance & best result)

3. Make a mixture of Wood Coal Powder Salt & Sand all in equal part

(a) Wood Coal Powder use as good conductor of electricity, anti corrosive, rust prove for GI Plate for long life.

(b) Salt use as electrolyte to form conductivity between GI Plate Coal and Earth with humidity

(c) Sand has used to form porosity to cycle water & humidity around the mixture

4. Put GI Plate (EARTH PLATE) of size 500 mm X 500 mm X 10 mm in the mid of mixture

5. Use Double GI Strip size 30 mm X 10 mm to connect GI Plate to System Earthling

6. It will be better to use GI Pipe of size 2.5" diameter with a Flange on the top of GI Pipe to cover GI Strip from EARTH PLATE to Top Flange

7. Cover Top of GI pipe with a T joint to avoid jamming of pipe with dust & mud and also use water time to time through this pipe to bottom of earth plate

8. Maintain less than one Ohm Resistance from EARTH PIT conductor to a distance of 15 Meters around the EARTH PIT with an other conductor dip on the Earth at least 500 mm deep.

9. Check Voltage between EARTH PIT conductor to Neutral of Mains Supply 220V AC 50 Hz it should be less than 2.0 Volts

Thanks

Aninash Pandey

Can you tell me how much will it cost to construct a earth pit of the following dimensions.

Installation of 40 mm * 3.5 mtr long GI earth pipe, 25 mm dia HDPE pipe for watering.

It would be helpful if I could get the split up along with total price including the supply costs of salt and charcoal, cost included in connecting the earth strip, marking earth pit using paint and backfilling.

You can exclude the cost of GI earth pipe, cost of earth chamber etc.

Also how many people would be required to do this work in how much time?

Thanks