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.

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!!!

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

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

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

Very useful, thanks very much for also adding the what if section, really helpful.

Thank you for your video. Very informative and helpful.

Fantastic video. Thanks for making it look easy to understand

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

thanks a lot for your recommendation and knowledge

good explanation John.

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.

Very informative, thanks!

You done a great job thank you so much. Very useful for me.

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.

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.

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

Thank you for this video sir.it's my first time working in earthing and im looking for some info.and im found yours.thanks.

Thank you so much!

Cheers for additional knowledge..

Wonderful.. So helpful, thanks John

(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.

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

Really informative videos. Be great to have one on hot tub installations as there's a lot of conflicting information around interpretation of BS7671 special locations, PME, TT systems etc. I'm sure you could guide people through the correct best practice, and I for one would appreciate some expert clarification.

This is deeper knowledge. We greatful

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.

Dear Sir I'm working on an existing hospital over 30 yrs old, and i found only lightening pits connected to the lightening grid on roof, how should I test the earthing system and is it possible for the designer to used the concrete grid instead of the earthing electrode ?

Great video very helpful

Hi this is great because it gives me ideas of how to achieve my goal, but I would like to know more about the meter you’re using I have been told I need to use a mega but this looks like something else you have but you did not mention what it was. I use Radio and I need to know I have a resistance of less than 10 ohms. This sends current, and I am afraid to test as I may damage my equipment. 🤔. This demonstration 👍 just need to know more.

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?

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

If u use a earth grid or earth tape how far do they need to be in the earth?

Do you have a reference for the easy method on your videos? I can't find the link despite searching. Thanks.

Need more details regarding how exactly this mechanism works

How to measure the resistance of the grid ? I believe the grid resistance will affect the earth resistance. Please correct me if I'm wrong

For real , thank you sir

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?

What's the purpose of moving the earth spikes please?

thanks a lot sir

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.

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

What do you do when you have the earth rod to test surrounded by concrete slab, where do you put the test probes with the spikes? Thanks for the vid 🤗

Nice course i appretiate it good explaination but thats not enough for me you suppose to talk about the soil type as well and the great ground résistance value for in low voltage and Médium voltage

Hi John, do you any video showing the use of method 1, i.e. mains?

When doing the 'rod test', all very well testing your own electrode, but what about the impedance of the earth-electrode at the source transformer, how do you test that // what standards is 'their' elecrode rated/checked to?

I like your videos and for any one that likes the history of this topic a great person to look up is Elihu Thomson.

I could not find your video about measuring earth resistance when the main electricity is available, and ask my question here Can one get results using any household electric appliance like, say, Incandescent light bulb, a mulimeter and the old good Ohm's Law? One terminal of the bulb is connected to live, the other to earth and the current is measured. Divide voltage by current and subtruct the bulb's resistance and the result is the earth resistance.

Some people ,knowingly or unknowingly, put common salt ,charcoal inside the pit(dug for the purpose), before putting a GI pipe (though costly). Will the salt help significantly or is it only a precaution?

so if we have well of earth 40m and electrode of 3m distance of t1 400 m

9:00 - Words spoken by someone who's obviously done this themselves ;-)

So how do you do this without special testers? Seems like you could

Thankyou sir

Dear Mr.John , I have to test the earthing for 40 connected electrodes (earthing network ) . Please tell me if I can use 62 % way , and please tell me if i have to isolate the electrode from the earhting network during this test ? Best Regards,

How can you test an earth electrode if you can not find it because it's Hiden under a deck or something please ?

Correct me if possible, but i thought the ideal Earth test resistance should be less than 1 Ohm?

Here in denmark, we rely on rcd's for protection. They are in fact required by law to be installed in all consumer units. Therefore, the earth electrode needs to fit the rcd. As 50 volts is max alowed for humans to touch and most rcd's trip at 0,03 amps, the max resistans for the earthrod is 50/0,03 = 1666 ohms. Some equipment require 0,1 or 0,3 amp rcd's so 500 and 166 ohms. Could you please explain why you say 100 ohms for TT in england? And thank you for all the videos you do, I realy enjoy watching them. As others has said before, you can explain things so everyone can understand them. Keep them comming 🙂

V nice sir good explain

where can I find the previous video or how is its filename so that I can watch it ?

I used to do this with a variation of a whetstone bridge

How we could test it if the main power available ?

Well, Can you Clarify my few doubts Sir. 1. What is the reason behind puting the 10 time of Depth of Earth road. If not maintained what will happen

Thsnks

What is the angle between other two electrodes

What do you do for earthing the elctrode if you live on a old lava field and have no soil besides solid lava rock?

I find it always best to use a 17th or 18th edition multi function tester to measure the Ra or earth fault loop impedance for the means of earthing. The three spike testers will not measure the critical loop to ensure automatic operation of the RCD's. They can be misunderstood and also show incorrect readings from the short temporary spikes into dryer topsoil rather than deep clay, Two wire testers will measure the entire earth fault path from the transformer through the line conductor, down the spike to the ground, and across the ground and back to the high voltage earth at the TX. this needs to be below 200 ohms and is the best method by far. You also need to ensure that you disconnect the earthing conductor and test only the means of earthing (NOT parallel paths to heating systems and water mains etc.) You MUST also ensure that this test is done with ALL current using equipment turned off at the main switch to ensure nobody can become injured while the earth has been disconnected.

That sun looking cool

كيفيت حساب

What shall be the earth electrode resistance

It should be noted TT earth impedance can easily double from wet months to dry months throughout the year, I guess that why

Super

is there not a risk of striking a buried cable or pipe when driving these electrodes in?

Good

He's wearing a Stewie T-Shirt. This is commendable !

Good.

Somebody is awake early!

Quiero que se explique en español por favor..

What madman dislikes earth electrode testing???

Dear sir, is the type of material of the electrode important and affecting the readings significantly?

After getting resistance of electrode , how to get soil resistivity

Stewie Griffin 😂 1st thing I noticed when video started. Thanks for sharing another great video. 👍

good vid, but slightly confused, putting aside the 10:1 rule surely connecting multiple rods to a soil with poor conductivity even if they are inches apart will gain more surface area, hence better figures. Im guessing that surface area plays a big role here

Question: Can a person who has ZERO ground in a house, ground just ONE power outlet in the house by running a ground wire from the ground terminal out into a grounded stake in the ground? My house has old screw in fuses, and absolutely no ground wire anywhere. There's no plumbing or anything in the house to use for a ground either. I run a compost toilet/outhouse, and haul water there. I want to avoid the risk of frying my electronics but I cannot afford a full electrical update. It's 10,000-12,000 to do this (almost as much as I PAID for the house!!)... I won't be able to afford it for YEARS best case. SO what I want to do, is somehow protect my electronics by at least grounding ONE outlet cheaply. Is this possible? AND NO, I DO NOT HAVE INSURANCE, so I don't care if things are certified insurable, just so long as my gear is safe.

I am unclear why the electrodes need to be far apart yet tape or a grid or a pipe are considered the same thing. They are not only Not Far Apart but continuous?

Wrong middle lead is 62% of long leads distance

Is this what is called 'Ra' testing?

Did I hear you right , earthing electrodes are not required on new installations .

Why do we do this test ?

229 dislikes. Arrest former CEO Susan for protecting corporations.

I have concrete ground 😢

Stewie!

Save the environment by writing on both sides of the paper or use a tablet!

I like and Englihs and spanish type bilingue okey...!

in hindi

ka hindi ma na bol sakte hai Na ki

bare mumble

Horrid explanation JW! This is the worst training on earth electrode testing that I’ve possibly ever seen! If you don’t know what you’re talking about, why would you sit there and muddle your way through it and tell people some stupid stories!