ConduDisc Final Tests - 4 Months Later
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- čas přidán 1. 09. 2021
- Testing the Condudisc and ConduCrete four months after installation. This was installed in April, this video made in August.
Original test result 19.9 ohms, new 16 ohms, roughly 20% reduction in resistance. Weather for the last several weeks has been very dry.
Previous videos:
Overview and Demonstration - • ConduDisc Demonstratio...
Installation - • ConduDisc and Conducre...
Others on earth electrodes and testing: • Earth Electrodes
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BT have started using conductive concrete on their street cabinets, I've had readings using method 2 as low as 0.74 ohms, it's good stuff.
Good results for the Condudisc there 👍, also love that you demonstrated the low current Zs test at the end and explained the reason behind the increased impedance in comparison to the Electrode test.
I’d install one of these over a rod any day of the week, especially if working in a non rural location.
Interesting bit of kit 👌🏼
Thanks test and info!
Very interesting subject and right on point with EV charger installs
Great set of videos and great way to educate the industry on the new product. The fall of potential method requires a fall gradient - a set of readings when taken when stakes at different distances which you showed. Well below the 25ohms which is what we require as the ground resistance threshold in the US in the us NFPA70(NEC 2020).
Excellent
So I tried to find your video to store onto ConduDisc...
I successfully did it from a JW production
We need this as we use the TT earthing system, and the rod is probably gone by now
Thank you very much for very informative video
I have a difficult (for me) setup and would welcome some advice. I have a metal framed/roofed house on a floating reinforced concrete slab, the rebar in the slab is electrically connected to the steel frame/roof, I believe this is called a UFER ground. On the roof I have solar panels which are isolated from the roof but earthed to the slab via an earth cable. The solar DC cables go to a shed 5 meters away into an inverter then the inverter feeds the house 230v AC. The shed and inverter are earthed with an earthing rod. Can I use the UFER earthing bonding point to earth everything and get rid of the ground rod? If not what ground should I used for the inverter and A/C supply? It is an off-grid build and the only buried cables are the solar DC and Return AC and earth in separate conduits. I have no restrictions or codes that I am obliged to adhere to (hence my self build) but I'd rather get this right now. If it makes a difference I intend to use RCBO's on each circuit once the internal wiring is done.
Got your Christmas trousers on there I see John
Is it not possible to neutralise the earth at the meter where supply enters the building ? Great bit of kit that disk
👍😬👌
It actually makes me wonder, are the standard earth rods out dated ? should we be moving forward with new systems and ways of doing things?
rods are still used yet they’re extremely old technology, and maybe things like this should be considered more
No it’s just giving you many more options especially in difficult ground when you hit bedrock early and where pushing in rods might be a really difficult and you would have to lay them at a shallow angle or put more rods in to get the resistance down to a reasonable number in US we use the 25ohm threshold. Rods will have there place as would this excellent product and other methods of earthing like mesh, rebarr foundation earthing for newer builds as they do in Europe and USA.
In my views you could create a mesh of these particularly useful in my view when installing EVs and you don’t trust the DNO earthing or worried about it degrading in the future.
The key question is not how old the technology is but whether it works. Other criteria are secondary.
@@JimWhitaker fuse wire works for your Fusebox also 😀 but there’s better technology out there now was my point really.
Not saying there’s anything wrong with rods. Just wondering why we’ve stuck with such an old way of doing things when everything else has advanced
Rods are still valid but have risks installing them if there are buried pipes/cables, and they corrode away fairly quickly, in some cases in just a few years. Multiple rods may be required for a low resistance.
Thanks cablesmith. I’ve just had a load of work done and they used really old technology, so it must be wrong and need replacing. Could you tell me what they should’ve put in instead? The stuff they installed is called “copper wire”.
Here can these be purchased John. I have a few sites that use generators on a bi weekly basis for 6 months of the year and these would give me a better option than a rod
earthingservices.com/condudisc/
Condudisc is a great product, just wish it was lower cost. I suppose on the other hand it's a reasonable price compared to costs of hitting something under ground.
Yes, it's all relative. Also consider the lifespan - 60+ years compared to a metal rod which can corrode away in 10 years or less.
@@jwflame Extra life span is interesting.
John, does it make any difference if one of the test ground leads goes off in one direction (say north) and the other test lead in the other direction ? (say south)
Yes, the electrode under test and the two test probes need to be in a straight line. It's measuring the voltage at the middle one with a known current flowing between the other two. If they were in different directions, the test won't work as there is no voltage to measure.
@@jwflame Not just simply a straight line but the yellow lead must be in the middle then.
I am interested in this test method. Never installed a rod before and i believe our test meters (kewtech kt64dl) dont have a function for this type of test, nor do we have the leads or electrodes for it. Is it not acceptable to simply perform a Ze test instead of this 3 wire test?
A Ze tests the whole earth loop including the supplier's electrode, and parallel paths to Earth via any bonding connected to the installation such as gas or water pipes.
To test the electrode only, the test as shown in the video is required.
The KT64 doesn't have that feature, it's only on the KT65.
Couldn't get less than 700 ohms in Bowdon near Altrincham. Post for EV charger sunk into ground and concreted in. Went below 20 ohms... Huge Csa helps clearly
Csa? Conductor surface area?
@@Gameboygenius Cross sectional area.. Less game boy more learning the most blindingly obvious
I wonder how well one of these would work for the RF earth for my amateur radio station
Contact area with the Earth is the most important factor.
@@bx16v I have had a good watch of all the earth videos from J.W. - excellent work too!
The point being that my (antenna) tower is an extraneous metal part of a structure with a sub installation. I have to assess the earth protection of the structure and subsequently any RF kit attached.
Any adequate earth is going to improve your RF path and or safety - provided it is entirely distinct from the mains protection or you may introduce ground loops and the possibility of live equipment where there should be none.
Any earth system should be connected to a single nodal point to prevent loops and voltage gradients. If your radio equipment is electrically isolated from mains voltages. IE battery powered or via isolation tx. AND the mains earth is NOT connected to it then you have independent RF earth/ground: indeed any ground electrode will make a ( big) difference. Especially on co-axial end fed antenna because of the imbalanced feed. But you must be sure that you do not disconnected electrical protection, or link RF circuits back to power circuits.
Hopefully this is helpful.
I wonder what it would be like after 20 years, hopefully it won't had fled by then!!
hello my friend
Iv followed Johns vids for years, But dose he ever answer anyones questions ??
Yes, but IME only the pertinent ones not addressed elsewhere, especially ones which address points which perhaps should have been covered in the video but weren't. Not sure why - perhaps he's he's got a life. :-)
Yes, so long as your not trolling :)
Many comments are replied to, but evidently not those which you have looked at.
@@jwflame Ok John keep up the good work.
You must of been out in the Dorset country side to get that low . It’s not Horton vineyard by any chance ? In Poole and Bournemouth your lucky to get under 200 ohms with multiple rods .
Lytchett Matravers
So doesn't the pole transformer have an earthed supply ?
Yes that is why John is putting a Earth disc in the ground. When a Fault occurs as long as the Earth resistance is less than 100 Ohms, enough current will travel back through the Earth to the Transformer to trip the RCD in the House.
Yes it does and this is why we test for Fault Loop Impedance
@@jimmeh213 So the issue is no earth conductor between transformer and property ?
If that's the issue, use neutral conductor.
@@millomweb the issue in JW's video is the fact that the soil is very rocky and compact - you struggle to hammer in an earth electrode.
So JW is showing us the alternative which is a disc with a large surface area in the ground.
@@timg6850 100 ohms - interesting random value. I'm going for 8kΩ
Whats the resistance on those leads you using? 🤣
Less than an ohm ;)
Why does eating tuna make me feel like I'm gonna explode?