Testing.. Never goes right..

[TPES]

TNCS - 0.35
TNS - 0.8
TT - 1667 although 200 is acceptable but it could be unstable and so should ideally be under 100.

Page 11 OSG

Cheers J

I've measured Ze on a TT as 0.27

Would you say ive messed up somewhere on the test as this seems VERY low ???

 

[Mr Mark Sparks]

a neutral to earth ir fault will do this because the fault path will go down the neutral to get away quicker

 

[Spudnik]

Hmmm not convinced.

Did you disconnect the main bonds as per normal?

 

[scotsparky]

Magic please note that the Supply athority will tell you there earth on a tt system will not exceed 21ohms. Bit like tncs-0.35 an tn-s .8

 

[spark1]

Cheers J

I've measured Ze on a TT as 0.27

Would you say ive messed up somewhere on the test as this seems VERY low ???

If you positively isolated the Main Earthing conductor from the Earth bar and main bonds then you will probably be reading through a parrallel path close to your earth rod...maybe a water or gas pipe....if this is your reading then record it on your test sheet but note down your reason.