Really low Ze from earth rod!

[LukeBuckaz]

Please be gentle...

...now I installed my first earth rod on saturday! I was expecting a really high Ze as up to 200ohms is allowed by BS7671. My Ze was 0.34. Does this seem odd to anyone that has done one/many before?

 

[MKS]

I was not around when the Tram system was built, but since it runs back end of the Green, Goose fair has lost some impact! :-(

 

[SPARTYKUS]

Sorry to luke the OP, gone off topic. MKS, good chap! Grew up on Rise Park.

 

[MKS]

Grew up in Snapewood! And concur on apology :-(

 

[LukeBuckaz]

Thanks for your replies folks, and thanks for not ripping me to shreds as it was my first earth rod installation. I will be sure to re-test when I go back in a couple of weeks.

 

[Toby Kuhnert]

I got an Ra of 17.6ohms from a single 1.2m 3/8" rod the other week. Do the 5/8" rods come pre-threaded for the coupler, or do you have to thread the rods?

 

[Geordie Spark]

Please be gentle...

...now I installed my first earth rod on saturday! I was expecting a really high Ze as up to 200ohms is allowed by BS7671. My Ze was 0.34. Does this seem odd to anyone that has done one/many before?

Engineer 54 will be doing handstands & cartwheels when he reads this one !!! :biggrinjester:


edit: oops ..... I've just found E54's post

 

[Engineer54]

I got an Ra of 17.6ohms from a single 1.2m 3/8" rod the other week. Do the 5/8" rods come pre-threaded for the coupler, or do you have to thread the rods?

Exactly as i thought, ....perhaps you should read this taken from post 41 on this thread

I wonder how many electricians just lately have been thinking that they've done well with values they have obtained, mainly due to driving a rod into water sodden soil?? Perhaps they all ought to go back and check again after a dry period!! The truth is, if they have only driven in a single rod, the chances are that the TT system they were so proud of, has risen in value by many ten's of Ohms and in all probably won't be stable....

 

[somersetsparks]

I got an Ra of 17.6ohms from a single 1.2m 3/8" rod the other week. Do the 5/8" rods come pre-threaded for the coupler, or do you have to thread the rods?

The rods we get come as just plain threaded rods, you can buy couplers, pointy ends for driving and beating ends for.. well beating!