Eicr earth rod over 200ohm

[GLENNSPARK]

What's the code for not deep enough? And should we pull it out to measure it every time we do an EICR?

Should I hand the big stirring spoon on to someone else to have a go now?

do what you like for me fella.

the fact is that i wouldn`t have left it in that state as it is....

 

[davesparks]

Why not? an EICR is a report on the condition, not usually a find it and put it right exercise.

I completely agree that something needs doing about it, but not until the whole EICR is completed and remedials agreed with the client. After all it may turn out that the whole place installation needs ripping out and starting again.

 

[GLENNSPARK]

Why not? an EICR is a report on the condition, not usually a find it and put it right exercise.

I completely agree that something needs doing about it, but not until the whole EICR is completed and remedials agreed with the client. After all it may turn out that the whole place installation needs ripping out and starting again.

no no no...lol

what i meant to say was i wouldn`t have installed it high like that in the first place...lol...

 

[High Tower]

I wouldn't be satisfied with a RA of anything over 5 or 10 ohms

 

[davesparks]

no no no...lol

what i meant to say was i wouldn`t have installed it high like that in the first place...lol...

Sorry, misread that a bit then.

I completely agree that I wouldn't install it like that.
I wouldn't normally leave it with an Ra less than 21, and also record details of each rod in the cert (location, length, size etc)

 

[D Skelton]

hmm...

unreliable Damian.

lets face it the value is going to fluctuate wildy....the whole idea of depth is stability....

This is not in dispute, but I've put in 8 and 12 foot rods down my way and hit nothing but solid chalk 6 inches below the soil suface and got waaay over 200ohms. The results however have remained stable.

 

[davesparks]

Rods may not be the most appropriate form of electrode then.

 

[D Skelton]

Rods may not be the most appropriate form of electrode then.

There are many ways it could be done, PME being my first choice, but when it isn't available what do you suggest? Earth tape? Ufer? Plates? Tell you what, next time I'll get the 360 out and get a nice big plate system in there!

The fact is, we have to be realistic. A stable 500ohms is just as effective as a stable 10ohms. If I get a stable value higher than 200ohms, I'm happy. As others say, the values are meaningless really, it is stability that counts.

 

[GLENNSPARK]

There are many ways it could be done, PME being my first choice, but when it isn't available what do you suggest? Earth tape? Ufer? Plates? Tell you what, next time I'll get the 360 out and get a nice big plate system in there!

The fact is, we have to be realistic. A stable 500ohms is just as effective as a stable 10ohms. If I get a stable value higher than 200ohms, I'm happy. As others say, the values are meaningless really, it is stability that counts.

you could build a nest....but you may still have the instability issues...

 

[D Skelton]

you could build a nest....but you may still have the instability issues...

I've used nests before, but only when I'm going for TN values, and only 10 miles or so inland where you hit clay and not chalk. Using a nest in chalk is just a massive waste of time and money. The thing is mate, I can drive a solid 8ft rod into chalk and get maybe 300-400ohms, but it will remain stable. I'm happy with that. In fact I'm happier with that than I would be banging in a 4ft twig and getting 150ohms. Either way, my 100mA s-type and my 30mA RCDs are going to operate exactly the same in both scenarios and be just as effective, only who knows what the result of that twig might one day end up as???

 

[MDJ]

Lol, I can see it now too! at least I had time for a cup of tea between posting it and it actually appearing!

Time now is 20:55, post the time when you first get to see this and we'll see how long it actually takes!

dave I gave up in the end yesterday, every time I tried to re-post anything the site kept crashing, it was ridiculous. Anyhow back to this, yup as mentioned I understand your point, the 1667 is in the regs in the table mentioned as the maximum ohm reading which will allow that trip of 30ma to trip in the required time, My understanding and to be honest the regs is a grey area again on this point is 200 is the maximum reading the regs consider stable. I disagree with that myself, it should be as close to 0 as possible. Page 100 in the OSG="the measured resistance should meet the criteria and those of 10.3.6 but, in any event should not exceed 200 ohms" also the table you showed earlier has part 2 under it suggesting the same, a grey area really, the OSG is like the beano with pictures of electrical situations rather than the bash street kids but 200 ohms as I see it should not be exceeded on a tt system.

 

[MDJ]

he's still waiting for a taxi then......

No he gave up after all the hassle trying to log in and post, it was ridiculous here yesterday, they need some admins here lol