Zs Query

[sijaysee]

i have a Zs of 240ohms on a TT system. On site guide say the max is 200 ohms. wot can i do if anything?

 

[davy_owen_88]

Move the rod to a better site, install a longer rod, install a second rod, check the connections at CU and at the rod itself, upgrade earthing conductor if undersized.

 

[didthathurt]

You need to check to ensure you have nothing that is increasing the Zs between the CU and the earthing system (poor or corroded connections). What you do thereafter depends on your geology. If you can get a longer, fatter stake in, do so. If you can't, which can be the case in parts of Cornwall I believe, you may be in to getting in specialist contractors to lay earth grids or any one of a number of other possible solutions.

 

[sijaysee]

ok thanks for the advice

 

[RF Lighting]

Have you contacted the DNO to see if a PME upgrade would be possible?

 

[ColJack]

more earth stakes, move to a wetter location ( near to a septic tank is a great place ).

you could always try the good old cheat method and pee into the earth rod pit.. give it a minute and then re-test..

also, what is your Ze?

it could be the earth rod is fine but it's a circuit problem..