Discuss TT system testing in the Electrical Forum area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:   American Electrical Advice Forum

It is quite normal to have multiple 1m spikes in a TT system in rocky areas, hence the use of copper tape surrounding the building in some locations or laid in a trench it's hard enough to get even a trench dug deep enough especially in mountainous regions. As I asked earlier check the cable between the earth spike and the DB disconnected from both ends, at least then we can rule that out.
 
I would start with logic, if the continuity reading is good but the Zs is not then logically it is going to be something that is unique to the Zs test that's causing the problem.
So that rules out the circuit itself, so that leaves the connections between the CU earth bar and the means of earthing, the connections of the live meter tail, the tester settings, the tester connections.
Start ruling these things out in a logical order, check all of your connections, retake the measurement after checking all test lead connections and the settings of the tester.

Check that you aren't using an 'anti trip' or low current test unnecessarily. If you do need to use an 'anti trip' test then this may account for the discrepancy, test a couple of circuits using the alternative test method and a high current test to see if this clears it up
Cheers mate
I did tell the op the rods need to go deeper then 1mtr.
The rods were hard enough to get 1m in never mind any further
 
Cheers mate

The rods were hard enough to get 1m in never mind any further

'hard enough' is very subjective and hard to advise on the solution without further information, is this particularly rocky ground or is it just a thick clay or something like that?
How did you install the rods? Small hammer, sledge hammer, kango with rod adaptor, drilled hole, dig and backfill?

Often you will find a hard layer that, once you have got through it, will give way to softer ground and make the second metre much easier.

If sinking an earth rod deeper is impossible I would personally be looking at a trench and horizontal electrode arrangement.
 

Reply to TT system testing in the Electrical Forum area at ElectriciansForums.net

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
This website was designed, optimised and is hosted by Untold Media. Operating under the name Untold Media since 2001.
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock