Hi Guys,
I'm a little stumped on a house I just tested.
Did all my relevent tests, all went well until I decided to do my Ze test.
Disconnected the main earth from the board to test and it came up as 153Ω!!!!
The system is a TN-S system and there are about 3 little pieces of steel wire twisted together going into an earth clamp. Even when i touched the earth clamp it was loose.
When I did the Zs it came up as 3.12Ω but that is with all the bonding attached to it. And I assume it was geting some form of earth off the pipework running in the ground. (just an assumption)
I have never encountered a problem like this. I though it was my tester and even used a different one.
I have done some testing but when things like this crop up I become foggy.
What should I do? I need to do something!notify the client about this and possibly the Authority (if it has lost its earth along the way)?
So far the rest of the circuits are all good with a few items that require upgrading for 17th edition but this earth has me stumped. I cannot issue her the report until I know whats wrong, hence my question.
I look forward to people's input and remarks / guidence.
Kind Regards,
Sparkydelux