Unable to find earth rod when doing EICR

[HappyHippyDad]

Evening chaps and SC...

I was carrying out an EICR today. I could not find the earth rod anywhere. I could see a 10mm leaving the CU and going down the wall of the porch then it goes at an angle through the wall (towards the outside) and then I cannot see anything else. Following the angle through the wall to the outside (20cm) leads to a conctrete step at the front entrance of the house. I think it's been concreted in.

I have 2 questions..

1. What do I put for 'presence and condition of earth electrode connection'? I guess it should be FI, but a degree of common sense has to be used as the chap is not going to let me dig up his front step. The resistance to earth of this cable was 63Ω.

2. What do I put as the Ze? Do I assume this is the Main Earth cable?

I can clearly see the pathway of the gas bonding. The water is bonded so this could be the Main Bond for the water but it's unlikely as there is a better pathway for the other 10mm leaving the CU to the water.

My thoughts are that I put NV for question 1 above and 63Ω for the Ze (with a note in the summary saying this is assuming that is the Main Earth cable)?

 

[Deleted member 26818]

Could put LIM as the customer won’t allow you to dig up his concrete steps.

 

[Octopus]

NV for the TT rod

And a comment that you don’t know what it is!

 

[oracle]

Measure it as a Ze, with a Lim for the concrete, as SL has offered.

 

[buzzlightyear]

buy a metal detector next time ,has above .

 

[HappyHippyDad]

Yes, I didn't think of Lim. I agree the Limitations before hand, but i see know reason why you cant have limitations throughout the job that were unforeseen before hand.
Cheers guys.

 

[Deleted member 9648]

I do not think a satisfactory can be applied to an EICR if the means and condition of the main earth cannot be verified. It would be FI for me, resulting in an unsatisfactory. If a remedial is requested I would forget the existing and install a new rod in an accessible location.

 

[Deleted member 9648]

Why optimistic Murdoch? Would you guess the means of earthing on an EICR?

 

[buzzlightyear]

Yes, I didn't think of Lim. I agree the Limitations before hand, but i see know reason why you cant have limitations throughout the job.
Cheers guys.

you could put down f1,and go back later armed with a jack hammer.

​

 

[Octopus]

Why optimistic Murdoch? Would you guess the means of earthing on an EICR?

I wasn't sure TBH how to rate it ........... so thought optimistic was appropriate ............... but I've just been re-reading the BPG no 4 and this situation isn't even mentioned .........

So I would agree that FI is probably the best course of action

But many wouldn't bother looking for the rod after they have a satisfactory reading.

I did an EICR recently, the Ze for the installation was good, I knew exactly where the rod was but couldn't get the inspection cover off - so I simply put a comment on the EICR...

 

[Deleted member 9648]

Not being able to remove an inspection cover and a wire disappearing into concrete to an unknown termination are very different things.

 

[Dave OCD]

As long as you have a decent reading and you're sure it's the earth and not one of the main bonds I wouldn't be concerned,but as it's not visible I'd be tempted to recommend an annual check of the Ze .

 

[TJ Anderson]

I can clearly see the pathway of the gas bonding. The water is bonded so this could be the Main Bond for the water but it's unlikely as there is a better pathway for the other 10mm leaving the CU to the water.

I know it's hindsight now, but you can always confirm bonding conductors with them disconnected using long lead test if unsure.

I think it just down to your judgement. As Ze is very acceptable, I would say either FI or LIM are perfectly reasonable.

Out of interest what sort of Zs's were you getting with bonds reconnected?

 

[buzzlightyear]

if you cant see it to confirm there is one earth rod . weather you are getting good reading you . you must confirm that you have see it . it might be a bicycle planted in the ground .

 

[Dave OCD]

'Oh bugger I've forgotten the earth rod, ah I know lets bury that old bike frame and connect to that instead !'