Earth Electrode Testing

Overview of different methods of testing earth electrodes to ensure their impedance is low enough.

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[ebaystars]

I am building my home in Thailand, realising early on that there is no electrical standard and very little knowledge of Earthing, I decided to use an UFER grounding system. All my rebar is connected together, by welding and thick copper/brass cable joints, then concrete is poured and metal points at 4 corners of each building come out and all the risers and are connected above the floor plane to a common point by copper cables, all dry, sheltered and protected. For anti corrosion I smuggled in a tin of Copperease (can't get that here along with Marmite and PG Tips) as we used to use that on ships' antennae installations, it doesn't wash off or emollify much. I use a Three Terminal Ying Tong Meter as above and thank you for your video as when I got it the bloody thing the destructions were all in Chinese. For the whole installation therefore I use multiple earths for each supply box being the UFER grounds, as the company supply earth isn't available (LN only) and anyway it's just a piece of galvanised metal buried in dry sand. Drinks are on me if you are ever in Hua Hin area.

[andreim]

Thank you for taking the time to make all these great videos and educate the rest of us. Best of luck to you and your family in 2017!!!

[tgwallbank]

Just to say I really enjoy your videos, the style in which they are presented and that I appreciate the amount of time you must spend in doing these. Thank you.

[TinG-hzfm]

Great video, though you could have mentioned that the middle electrode (commonly designated as S) is just a high impedance voltage measuring probe, while the outer probes (commonly designated as E (earth) and H(auxiliary)) are used to inject AC current into the soil. Resistance is calculated internally as the voltage measured at the S-probe divided by the current measured internally by the instrument itself.

[robbiesinyangwe]

Thank you for your time to teach. You make understanding simple. Thank you Sir!

[jmack]

Another excellent, well explained video.Cheers John.And Happy New Year

[fardellp]

Surely the resistance will vary greatly at the same installation depending on the type of soil and for a given soil type, its wetness or dryness. Presumably the test should be done after a (long) dry spell.

[alialshammari]

Thank you so much sir for your rich information and simple gorgeous way in explaining the lecture, appreciate your help and effort making the information so simple and approachable, from kuwait ali

[firasalam]

Thanks A lot John! very clear and the explanation is straight to the point !

[Motorman]

Thanks John. You mentioned that you might be doing these tests while it is raining. Is it necessary to repeat the test when the ground is drier to ensure that the resistance will still be low enough during hot periods with little rain, or does it not change much?

[jenko]

I like your videos because I like to see the differences from here in the US . We should all use the term earthing like you guys do . We just say grounding wire and some times there is confusion between it and the neutral, and as you know we split our 240 to 120 circuts so a neutral go with every 120 circut. This was deliberately set up by Elihu Thomson for safety?

[peterjones]

Im wondering which direction you would go away from the original earth stake. If i had a new overhead pole put in for my new supply (I'm very out in the sticks) would I be advised to head towards the pole which happens to be in the same direction of an overhead transformer for me and a neighbour on the next farm.
The new supply is PME but the estimator guy said to put an earth stake in with a 25mm CPC connection to it. Never had that request before in my youger days of new house etc.

[CaptainK]

(Newbie) So what’s the score on wet ground? If you do the tests/install in a soggy February and you get good reading and we have a very dry summer and the ground drys out. Cheers enjoy the vids.

[Teenagegoogoomuk]

Damn!! here in the US we have to use 10 foot (3m) rods and achieve 3 to 6 ohms of resistance. I've also had to use 1/4" x 12" X 12" copper plate or ufer grounds for the hard to get places.

[nilusahio]

why resistance decreases by increasing the distance between the two rod?

[ajvantonder]

Hey John hope you can help me with the question it reads: A maximum earth resistance of 300 Ω, shall be maintained between electric fence earth
electrodes. Do I connect the leads to both electrodes +- 30meters away. Or do I insert the small electrodes into the ground as shown on your video the electrodes are 1.2meter long.

[wayneisinwater]

hey john! great video. i realyl like the quality of your videos. what kind of camera do you use?

[i-will-get-you-there]

Thanks for the vid...
Have a good new year!
Cheers

[dreamkiss]

I am trying to find the video for the first method of earth testing when power is available, cannot find it ?

[Animation_jokes]

Need more details regarding how exactly this mechanism works