How to Measure Earth Resistance?

• BS 7430:1998 – 10.2

And there is another equation which you should look up yourself, as I am being busy with other stuff. Heheheheheheh...

That is theoretical and it is measured by earth resistance tester called Megger practically. I would refrain from posting the test setup and test procedure :)

Dear,

I have been asked to calculate ground resistance test. I've searched the internet (thoroughly) but I'm still confused.

It's a fabrication shop. Bare copper cable is installed around the shop and rods are driven at 3 different locations (connected to that bare copper of course :).

Now what I'm able to understand is that I have to perform fall of potential test ONLY which I did. Below is the summary of the test:

P=voltage rod, c=current rod, E=earth electrode under test

Rod 1

E at 6 meters from P and 12 meters from C

resistance =1.9 ohm

Rod 2

E at 6 meters from P and 12 meters from C

resistance =0.8 ohm

Rod 3

E at 6 meters from P and 12 meters from C

resistance =2.2 ohm

Is this test enough? Or are there any other tests? Because only this test doesn't make sense to me as it shows resistance of electrode, contact and surrounding earth but doesn't take into account the resistance of ground grid etc.

My question is too long. I would really appreciate your response.

thanks

IS 3043-1987

Dear sir

Please tell me what is coordination lus ix vi vi volts and vi iii iv iii i o vii vi vi amps add will leads to contact resistance.

Greek & Latin to me!!!!!