Earth rod, RCD tripping fault

[Jel]

1st question:
Had to install a earth Rod in rural area today because the Ze on the current TN-S system was too high.
All the circuits are brand new, but for some reason a circuit with LED Haler downslight on seem to trip when the systems earth is changed to the earth rod. The Ze of the system is 11.1ohms.
Every other circuit is fine.

2nd Question:
As my Ze is higher, all the readings im getting for my Zs are too high, but would i be right in thinking they circuits meet the disconnection times because of the RCD, so the high Zs does not matter?

 

[GLENNSPARK]

How can you do a ZE with a RCD in the circuit as it will trip out immediately as it see a line to earth fault.!!

well it wouldn`t be a Ze would it.....more a Zdb......

 

[Guitarist]

What is the actual Ze ?

 

[tony mc]

Im lost again an out building with loads of halers.

Is it the out building that has the Rod or the main Earthing arrangements for the premises as you say the reading for the TNS was too high!!

 

[GLENNSPARK]

What is the actual Ze ?

well this is what i wanted to know at #14.....

 

[Jel]

Being stupid, as their was no main earth bonds connected thought it would be ok.

Have not been able to test inside the house yet as owner are away till next week, but i have had major issues with DNO lately and Ze being too high and they will not do anything about it as they say they do not maintain the earth?

 

[Jel]

Ze is 1.48 on TNS

 

[Snapester]

Confused :dizzy2:

 

[GLENNSPARK]

Im lost again an out building with loads of halers.

Is it the out building that has the Rod or the main Earthing arrangements for the premises as you say the reading for the TNS was too high!!

can get like a roundabout these....lol....

 

[GLENNSPARK]

Ze is 1.48 on TNS

and is this at the incoming supply to the property (house C/U)..?.....

 

[Jel]

Ok sorry only referring to outbuilding.
The Ze of outbuilding if i use the TNS supply is 1.48. If i use the earth rod we put in then the Ze is 11.1

 

[GLENNSPARK]

because if it is and the DNOs equipment is already being used as the means of earthing to this property ..clearly it is (TN-S)....then they have a duty of care to maintain this arrangement......

 

[Snapester]

OP said couldn't get access so i'm thinking no, which could be the reason for his high Ze value.

 

[Jel]

Have not tested the Ze of the main house where the Ze supply comes from as owners are away till next week.

 

[Snapester]

I would say earthing is fine and testing needs re going over. Fault lies in wiring.

 

[Jel]

because if it is and the DNOs equipment is already being used as the means of earthing to this property ..clearly it is (TN-S)....then they have a duty of care to maintain this arrangement......

I have had 2 flats i tested in london in the past 2 months where DNO will not sort out high Ze. Has been a nightmare!