Zs Problem

[dnk1983]

Hey folk. i have been doing some testing and up to now i have had no problems. however today i have been getting a reading of >2000 ohms when doing a Zs test. i have been searching my brain and evrything else for a reason for this but cant find anything. this reading i am getting is right through the whole installation from the individual DB right back to the Main panel. would really appreciate it if anyone has any reason behind this. thanks.

 

[Doomed]

what was the r1 + r2 reading?

 

[dnk1983]

which ones?

 

[dnk1983]

in the db currently testing, the R1+R2 hasnt been higher than 0.20 ohms

 

[Deleted member 9648]

What was the Ze/Zdb reading?.....if it's across the board it suggests a loss of main earth. Is the meter working correctly as well?
What is the purpose of this test....I hope it's not an EICR....if you cant work out a high Zs reading?

 

[dnk1983]

getting the same at the main panel. its powered by a generator and everything was fine yesterday so i am unsure as to how this has happened today.
its an installation for camp accommodation.

 

[Simon Torr]

what is the ambient temperature at the time of test, and the max operating temperature of time of test, it say s both of which will have an effect on conductor resistance

 

[tigerpaul]

Powered by generator...

 

[tigerpaul]

Powered by generator.. Does the generator have an earth spike?

 

[dnk1983]

earth rods are intsalled around the gene. i am in afghanistan working and the ground isnt very good for getting a good Ze but i was still getting 0.15 ohms yesterday as a Ze reading so how this has changed overnight is beyond me

 

[Mark_Burgess]

Taliban pikeys stole the copper earth cable!!

 

[dnk1983]

lol @ Mark. aye you're probably right. well it is somehow managed to rectify itself and i am now getting a Ze reading well within what it needs to be. think it might have been an issue with the meter but whoknows. thanks for your help guys.

 

[Engineer54]

earth rods are intsalled around the gene. i am in afghanistan working and the ground isnt very good for getting a good Ze but i was still getting 0.15 ohms yesterday as a Ze reading so how this has changed overnight is beyond me

I would have to beg to differ, if your getting Ra/Ze readings of 0.15 ohms!!!! ..lol!!!

I bet they're not using the short 3/8'' twigs for they're earth electrodes, more like the 10 foot 5/8'' or 3/4'' proper earth rods, and linking a good few of them out too...lol!!!

 

[GLENNSPARK]

what is the ambient temperature at the time of test, and the max operating temperature of time of test, it say s both of which will have an effect on conductor resistance

what?...greater than 2000 ohms?..lolffs..