New Member with an EICR question on max Ze reading

[Clarkie]

Afternoon Ladies & Gents,

I'm a new member to the forum so thought I'd introduce myself.
Been qualified for around 10 years and have finally set up on my own. I am new to the test and inspection side of things so I am seeking advise on the following question. Any help would be greatly appreciated.

A friend of my misses is buying her first property and the seller has had a EICR completed. Now the question is that the installation is recorded as a TN-S with a Ze of 2.1 ohms.

My understanding is that the Ze for a TN-S is 0.8 ohms. Am I missing something or is this reading excessively high?

Any help/advice appreciated

Regards

Clarkie

 

[Midwest]

The EICR chaps will be along shortly, in the meantime you are correct that the Ze for a TN-S system is around the 0.8 figure, although in may be higher in rural areas.

Perhaps the home owner should ask the DNO for advice on this matter. They may say it is what it is, and are not obliged to improve it. What did the EICR suggest?

 

[Clarkie]

Hi
The EICR made no other comment or recommendations on this point

Clarkie

 

[Midwest]

As said you could speak to the DNO, they may be able to improve things, conversion to TNC-S might be an option.

 

[buzzlightyear]

put is on here you

 

[Midwest]

Hi
The EICR made no other comment or recommendations on this point

Clarkie

Did they do a Zs on final circuits?

 

[buzzlightyear]

can you upload test certs, saw we can have butchers at them .

 

[Octopus]

This is an interesting question no doubt..... The EICR forms allow you to comment on the incoming service supply but they are technically outside the scope of the EICR.

I would have commented.

Such a high Ze would mean all 20a and above circuits would exceed their max Zs so there must be RCD's installed.

Calling the DNO may result in them not doing anything.....

 

[Midwest]

Calling the DNO may result in them not doing anything.....

No harm in trying though........

PS Been on Summit Plummet yet Murdoch

 

[Clarkie]

Will upload the EICR later on, but in answer to Midwest yes they did a Zs on both final rings with the same reading of 0.39 ohms

 

[Midwest]

Will upload the EICR later on, but in answer to Midwest yes they did a Zs on both final rings with the same reading of 0.39 ohms

The property must have some chunky metal service pipes in, or the Ze is incorrect. What do ya think EICR warriors?

Have you considered contacting the DNO and asking them, they won't bite and usually will come and have a butchers for free.

 

[Rpa07]

Decimal point in wrong place and TNCS?

 

[Rpa07]

put is on here you

5 random words put together Buzz - nearly made sense!

 

[Lou]

Welcome

 

[Midwest]

5 random words put together Buzz - nearly made sense!

I think he's improving, his next post was nearly a full sentence.

 

[westward10]

Assuming the Ze was measured with the main protective bonds disconnected that is far too high and with those Zs readings it sounds like it is being earthed by other means.

 

[telectrix]

or the Ze is 0.21 after the tester went to specsavers. i.ve frequently come across TN-S at well under o.8. at home it's 0.18.

 

[Sparky Ninja]

Something in the information does seem a little strange. If the supply EFLI is that much though then as stated on the Condition Report guidance for recipients:

Where inadequacies in distributor's equipment are encountered, it is recommended that the person ordering the report informs the appropriate authority.

But naturally, it is up to the skilled person to identify the inadequacy and provide accurate information for the person ordering the report to actually report it.

But I very much doubt those readings are accurate.

 

[Midwest]

or the Ze is 0.21 after the tester went to specsavers. i.ve frequently come across TN-S at well under o.8. at home it'so.18.

too slow

 

[telectrix]

only just got in after an investigation into paul's post regarding his security lights.