TT off water main or tncs with no earth (Victorian house city centre)

[mhar]

What is the earthing block to the rh side of the cutout?
The cutout is just one of the solid n e ones which doesn't require a link. That cannot be taken as an indication that PME is available

 

[suffolkspark]

have you taken a reading to see if you can just stick that conveniently located earth wire in that neutral block or are we just overcomplicating things here?

 

[James Kinrosd]

The earth block runs into the terminal and there is space for a link, the neighbour's block is identical and has a link- here's the a pic of the next door one...

 

[James Kinrosd]

Yes I read through the neutral got a nice 0.27 Ohms...

 

[NDG Elecs]

I had a dodgy homemade tns the other week with a Ze in the kilo ohms. DNO came out, officially declared it was never a tns (probably was in reality, should check a few neighbours maybe) and that I should TT it. Very decent initial Ra of 11 ohms from one rod, with a Zs that dropped to 1.35 ohms ish on a B32 with the water bond. I am very tempted to bang another rod in to see if I can bring the Zs's down further, albeit with a lot of thanks to the water supply pipe!

 

[Octopus]

I was under the impression that you can only use a water pipe of it's your own private supply ..

 

[BOYD BARKLEY]

I was under the impression that you can only use a water pipe of it's your own private supply ..

542.2.6 Dose state that.

I was under the impression that you can only use a water pipe of it's your own private supply ..

I was under the impression that you can only use a water pipe of it's your own private supply ..

 

[ruston]

It goes on to say that other metallic water supply pipework should not be used as an earth electrode unless precautions against it's removal and it has been considered for such use.

 

[BOYD BARKLEY]

It goes on to say that other metallic water supply pipework should not be used as an earth electrode unless precautions against it's removal and it has been considered for such use.

Yes, it dose.

 

[Taylortwocities]

You should keep an eye on the 18th. It has a few things to say about this

Chapter 54
CLICK

 

[BOYD BARKLEY]

You should keep an eye on the 18th. It has a few things to say about this

Chapter 54
CLICK

Thankyou. Here we go again, many questions will follow the path of
ambiguity. They love it don't they !

 

[mjb]

Looks like a TNS from a lead covered cable.
Originally supply cables did not provide an earth point the lead just providing protection for the cable, so many services are actually TNS with no earth terminal.

 

[Nigel]

Did you ky disconnect all parrellel paths before doing the Ze test?

 

[stevels4]

The earth block runs into the terminal and there is space for a link, the neighbour's block is identical and has a link- here's the a pic of the next door one...View attachment 41076

That is TNS.

 

[davesparks]

The earth block runs into the terminal and there is space for a link, the neighbour's block is identical and has a link- here's the a pic of the next door one...View attachment 41076

That is a TNS cutout fed by a split concentric cable, you can just see the bare earth conductors connected to the earth terminal internally.

However this begs the question of why you are breaking the seals and taking cutouts apart?

 

[davesparks]

If that's the the case and yo've got 37 ohms yo've cracked it any thing under 100 is fine.

Where did you get that bit of nonsense from? Direct from the -------- generator at NICEIC headquarters?

 

[BOYD BARKLEY]

Where did you get that bit of nonsense from? Direct from the ******** generator at NICEIC headquarters?

For embedded metal work or earth rod ********

Where did you get that bit of nonsense from? Direct from the ******** generator at NICEIC headquarters?

 

[davesparks]

For embedded metal work or earth rod ********

Eh? I asked where you got that value from, not what you were referring to.

 

[BOYD BARKLEY]

Eh? I asked where you got that value from, not what you were referring to.

200 Ohms is the value recommended not to be exceeded in regs, as you well kn0w . Yes NICEIC do recommend under 100. For an earth electrode. So far as the nonsense is concerned(I'll be objective here not obstructive)If you look at B.S.7430 IT RECOMMENDS 100 ohms max and 2 meters of rod as the top meter of soil can be unreliable. Eh?

 

[Sylvia Namusisi]

@James Kinrosd. A water pipe can be used with the owners permission .

Not with the current regs,it will not comply.You would have to drive a new earth electrode down.