TT Earth system tester

[Prytaneion]

 

[Nigel]

I have always thought Ze was the external earth loop resistance back to the transformer if there is no supply earth how do you get a Ze reading , or am I missing something ?

You said there was no Ze on a TT. There is on a live system and this would normally be the way of measuring the earth. However on a new installation with no supply you then need to measure the Ra which ia a dead test.

 

[Flanders]

You said there was no Ze on a TT. There is on a live system and this would normally be the way of measuring the earth. However on a new installation with no supply you then need to measure the Ra which ia a dead test.

Yes thanks essex ( You don't need to tell me twice ☺ )I dont no why but I thought RA was used for the live test aswell , Thats why you earth an earth loop tester to test it , now i do feel stupid. I realise now the earth path back to the centre point is the a actual Earth (thanks to the pic the OP posted) By the way just checked in the BBB and its RA not Ra, dont want the symbol police saying we are using the wrong one ☺

 

[Nigel]

Yes thanks essex ( You don't need to tell me twice ☺ )I dont no why but I thought RA was used for the live test aswell , Thats why you earth an earth loop tester to test it , now i do feel stupid. I realise now the earth path back to the centre point is the a actual Earth (thanks to the pic the OP posted) By the way just checked in the BBB and its RA not Ra, dont want the symbol police saying we are using the wrong one ☺

You are not stupid. The term ‘Ra’ is used a lot on here incorrectly.

 

[Prytaneion]

We all make mistakes,,, that's why they put rubbers on the end of pencils...
Don't be too hard on yourselves guys. The fact that you hang around fora like this shows you have the best of intentions and the welfare of your trade at heart. Thanks for your help and advice.