Unable to find earth rod when doing EICR

[KevinH]

This is true Essex, but we can normally check what's on the end of the cable right?

 

[Deuce]

You cannot see the cables in the wall but we do not assume thay are wrong unless proved by testing.

No different here.

It's totally different. You know it's a cable, you can easily access at least one end of it. You can identify the cable type and check it's suitable. Even if technically a length of cable is hidden between two concealed boxes on a circuit, you can still check that it exists by testing what you can access.

It is however possible the electrode does not exist, or is not connected. That cannot be confidently revealed by testing alone.

 

[markc123]

You cannot see the cables in the wall but we do not assume thay are wrong unless proved by testing.

No different here.

It absolutley is different.

Fault on circuits - breakers trip.

Main earth not stable - zs’s not stable - potentially for MCBS not to trip under fault conditions.

Can’t compare the main earth to circuits IMO. The problem with the main earth is that once it’s failed it could be too late and there isn’t any warning.

The main earth needs to be accessible for maintenance and testing. Period.

 

[Deuce]

It absolutley is different.

Fault on circuits - breakers trip.

Main earth not stable - zs’s not stable - potentially for MCBS not to trip under fault conditions.

Can’t compare the main earth to circuits IMO. The problem with the main earth is that once it’s failed it could be too late and there isn’t any warning.

The main earth needs to be accessible for maintenance and testing. Period.

That's another angle that keeps being skipped as people try to compare this to other situations.

This isn't a protected component... it IS the protection. We can all appreciate that houses get pulled around and often access to certain parts of the electrical installation are a nightmare, sometimes it's simply more practical to go on the weight of evidence, testing, and in the end to assume something is fine and there is no need for further investigation. But if you get ONE thing right, absolutely beyond a shadow of a doubt. Get the earthing of the entire house right.

Question I suppose... Would you bet your life the electrode is present, correct and suitably attached? I wouldn't so I certainly wouldn't bet the life of my customer. I would bet £1000 it's all there, maybe more - I would almost certainly make a tidy return on that bet

But not a life. That's my stance.

 

[KevinH]

Helluva speech deuce, I reckon that sums up the answer to this thread!

 

[Deuce]

Helluva speech deuce, I reckon that sums up the answer to this thread!

Thanks

To be fair, I think a lot of folk want to argue specific technical points on these forums - which is fine, I do it too.

But on this occasion I can't accept there is any correct resolution other than starting by sinking a new rod. Any other debate about how to correctly evaluate the current situation is secondary to me. And I'm wondering why the OP hasn't come back yet to say they have had that conversation with the customer.

 

[Ian1981]

So if there’s a 10mm connected in the dB say for the protective bonding conductor to the gas but you can’t confirm the connection at the gas end where it’s connected (built in to the fabric of the building), you do a R2 test on the pipework with all parallel paths disconnected as far as reasonably practicable, you get a reading of say 0.03 ohms, do you FI the fact you can’t see the connection for inspection and testing purposes?
Bare in mind that all though it’s not the principle form of earthing to the installation it’s importance that the bonding is present and connected is paramount for ADS.

 

[KevinH]

Personally I would FI any bonding incoming gas/water pipes if connection not visible/accessible to be able to remove and get an R2 to confirm. Otherwise what's to say the 10mm from board is connected to the pipe at all? and that your reading on the pipe isn't just a parallel path that hasn't been found/disconnected?
Normally on a EICR form there is simply a pass or fail tick box for condition/accessibility to bonding connections so if I can't see it.....its a fail. Simple!

 

[Ian1981]

There is no pass or fail box, it’s a tick for confirmation of an acceptable test of continuity.
In the schedules of inspections there’s a box for the condition and accessibility of the bonding conductors and it’s outcome.
A tick or a suitable code if applicable
So for an FI code you think that there’s potential or immediate danger.
Even tho a continuity test has confirmed a low resistance to earth.
Depending on the reading say 0.03 ohms you could even calculate if it’s a realistic value depending on the estimated cable run from the dB to the gas service.
A reading so low is unlikely to be from another circuits cpc in my opinion.
Just my take on it

 

[KevinH]

Fair enough a tick box for confirmation of continuity. But can you confirm continuity without disconnecting and doing an R2 to prove its not broken?
If I can't see it to remove it, then I can't confirm, therefore I give it a code FI. Or am I being too harsh?

 

[Ian1981]

Fair enough a tick box for confirmation of continuity. But can you confirm continuity without disconnecting and doing an R2 to prove its not broken?
If I can't see it to remove it, then I can't confirm, therefore I give it a code FI. Or am I being too harsh?

It’s one of them isn’t it?
It’s down to the inspector at the end of the day and it’s clear we all have different opinions so maybe there’s no right or wrong answer and you have to justify your actions with yourself.
It’s usually the kitchen fitters fault for boxing over the pipework so let’s blame him

 

[KevinH]

Yep. Its a funny old game. Oh I love my job

 

[Deleted member 26818]

Fair enough a tick box for confirmation of continuity. But can you confirm continuity without disconnecting and doing an R2 to prove its not broken?
If I can't see it to remove it, then I can't confirm, therefore I give it a code FI. Or am I being too harsh?

Well, if you believe there is no earthing (which would warrant a code C2), then your FI would be fair.

 

[Nigel]

It's totally different. You know it's a cable, you can easily access at least one end of it. You can identify the cable type and check it's suitable. Even if technically a length of cable is hidden between two concealed boxes on a circuit, you can still check that it exists by testing what you can access.

It is however possible the electrode does not exist, or is not connected. That cannot be confidently revealed by testing alone.

Is there a specified type of electrode that can only be used?

 

[Nigel]

It absolutley is different.

Fault on circuits - breakers trip.

Main earth not stable - zs’s not stable - potentially for MCBS not to trip under fault conditions.

Can’t compare the main earth to circuits IMO. The problem with the main earth is that once it’s failed it could be too late and there isn’t any warning.

The main earth needs to be accessible for maintenance and testing. Period.

A TT would not be relying on MCBs for fault protection due to the unreliable earth.

 

[Nigel]

Personally I would FI any bonding incoming gas/water pipes if connection not visible/accessible to be able to remove and get an R2 to confirm. Otherwise what's to say the 10mm from board is connected to the pipe at all? and that your reading on the pipe isn't just a parallel path that hasn't been found/disconnected?
Normally on a EICR form there is simply a pass or fail tick box for condition/accessibility to bonding connections so if I can't see it.....its a fail. Simple!

Mental.

 

[Deuce]

Is there a specified type of electrode that can only be used?

I don't know why you would need to ask that question..? You have argued a somewhat minority view on this thread, and resorted to ever more peripheral technicalities to make your point. And now you ask me a rather basic question about the selection of electrode?

Anyway, any type is fine so long as it's installed as per regulation. But in some places, certain materials could prove a very poor choice long term. That's a great reason to leave them accessible, for visual inspection. Corrosion tends to occur top down initially as this is where the material has most access to air, the lower part being effectively in an anaerobic enclosure. Although in the end the corrosion will spread uniformly. This means there is a good opportunity to get an early warning if the material selected is corroding much faster than would be expected.

As corrosion will start top down, it's also useful to be able to see the clamp to check for corrosion around it's contact area with the electrode.

And once again, in this case - it would also be useful to know it actually exists and is still connected.

 

[Nigel]

I don't know why you would need to ask that question..? You have argued a somewhat minority view on this thread, and resorted to ever more peripheral technicalities to make your point. And now you ask me a rather basic question about the selection of electrode?

Anyway, any type is fine so long as it's installed as per regulation. But in some places, certain materials could prove a very poor choice long term. That's a great reason to leave them accessible, for visual inspection. Corrosion tends to occur top down initially as this is where the material has most access to air, the lower part being effectively in an anaerobic enclosure. Although in the end the corrosion will spread uniformly. This means there is a good opportunity to get an early warning if the material selected is corroding much faster than would be expected.

As corrosion will start top down, it's also useful to be able to see the clamp to check for corrosion around it's contact area with the electrode.

And once again, in this case - it would also be useful to know it actually exists and is still connected.

I am sorry mate but you are talking absolute tosh. You have presented zero evidence to back up your stance other than that you want to see it.

I agree a C3 but would you dig up the complete rod to inspect it on every EICR? I mean who knows what the state could be under ground. Surely you would want to check the whole rod?

Also you would want to inspect fully every cpc throughout the installation. I mean it could go to anywhere once in the wall couldn’t it?

 

[Deuce]

I am sorry mate but you are talking absolute tosh. You have presented zero evidence to back up your stance other than that you want to see it.

I agree a C3 but would you dig up the complete rod to inspect it on every EICR? I mean who knows what the state could be under ground. Surely you would want to check the whole rod?

Also you would want to inspect fully every cpc throughout the installation. I mean it could go to anywhere once in the wall couldn’t it?

You asked a question, I answered.

I never suggested anything about digging up the rod to inspect it. You're reacting very quickly to what you think I'm saying, please read more thoroughly.

I also never gave any opinion on the c3. At any point.

All I have stated is my opinion that as the rod is now totally inaccessible it should just be a new rod. It's ok if you disagree but at least remain polite. Especially when I was only answering a question you asked to the best of my knowledge.