Discuss Zs reading with main earth disconnected in the UK Electrical Forum area at ElectriciansForums.net
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?
Reply to Zs reading with main earth disconnected in the UK Electrical Forum area at ElectriciansForums.net