Discuss Zs reading with main earth disconnected in the UK Electrical Forum area at ElectriciansForums.net
stupid thing any body can do ,op where you going to rely on the bonding .Also why is the installation energised with the main earth disconnected
If you have main earth disconnected , surely it would be ZE not ZS.? (at source)
Parallel path via CPC to boiler circuit CPC to boiler manifold to pipework within the fabric of the building?
Also why is the installation energised with the main earth disconnected?
Parallel path via CPC to boiler circuit CPC to boiler manifold to pipework within the fabric of the building?
Also why is the installation energised with the main earth disconnected?
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working on the HIGGS BOSON PROJECT.Many years ago I used to disconnect the main earth and carry out various tests to help me understand parallel earths in electrical installations.
Done lots of other experimental testing in a controlled environment...
You can’t make an omelette without breaking a few eggs.....Many years ago I used to disconnect the main earth and carry out various tests to help me understand parallel earths in electrical installations.
Done lots of other experimental testing in a controlled environment...
Just try and eliminate things and to see if I was picking up earth from elsewhere I then disconnected the main earth and still had a reading of 2.2 ohms.
Thanks for that post really helpful!Why do this as a live test when that means doing something as stupid as energising the installation with the earthing conductor disconnected?
Electricians are supposed to understand the fundamental principles of electrical safety!
I understand that but my MFT has those two choices. The KT63 has a piggy back lead that you place the earth lead into to test across L-N I am not truly sure of the purpose of this but there it is. Perhaps you could shed some light on that?Zs is line to earth external impedance, it stands for nothing else.
Depending on circumstances, main earth may need to be disconnected to verify certain fault conditions..
All comes down to knowledge, understanding what is going on and being in control of the location.
Of course there is PSCC and PEFC which I also understand before you go there. I know I should have said loop test. Or PFC PSC even
What conditions would they be?
I can't think of any reason to have an installation which relies on ADS energised without its connection to the earthing system.
Ever been to a property that has an earth fault due to the neighbours or for other extraneous reasons?
As long as there are no members of the public, what have you, present, does it matter?I don't believe I have, but I don't see how that requires the installation to be energised without being connected to earth?
As long as there are no members of the public, what have you, present, does it matter?
How on earth would you risk assess it as safe to do to start with?
Ha - I start by safely isolating the supply, not the earth .The same way you would for any other earth fault that could potentially give you an electric shock.
Ha - I start by safely isolating the supply, not the earth .
Maybe, in my dreams .And if you can’t safely isolate the supply?
Do you check the earth before you touch the metal board?
Maybe, in my dreams .
I’d start a new thread if I were you and explain why you are doing this in the first place. Only disconnect the main earth to get a Ze reading. Then do dead tests to investigate anything.did you finally find the root cause of your problem ? if yes i would appreciate you share it. i have the same. w / wo main Earth wire connected i read same Zs 1.5 ohms. ( TT system) . thank you
I have a TT system ( earth not connected anywhere in any panel with neutral ) and the result i git for Zs was too good to be true . I understood that for a TT system you can not get less than 10 ohms but in my case was 1.5 ohms. I just tested w/o main earth connected to see result..like trying to understand the phenomenonI’d start a new thread if I were you and explain why you are doing this in the first place. Only disconnect the main earth to get a Ze reading. Then do dead tests to investigate anything.
A Zs test with the main earth disconnected should never happen.
I understand what you are asking - you are saying how can the earth path be this good.I have a TT system ( earth not connected anywhere in any panel with neutral ) and the result i git for Zs was too good to be true . I understood that for a TT system you can not get less than 10 ohms but in my case was 1.5 ohms. I just tested w/o main earth connected to see result..like trying to understand the phenomenon
. I understood that for a TT system you can not get less than 10 ohms but in my case was 1.5 ohms
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