Discuss High TNS readingssssss in the Electrical Forum area at ElectriciansForums.net

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Looks like it was never installed correctly unfortunately.

In this instance I would code it as a C2 and quote to install a 500mA RCD for fault protection for the circuits that do not meet the maximum permitted Zs via the MCB.

Remember the RCD will need to be installed at the supply end of the cable.

No need to TT it and make the earth even worse.
 
Looks like it was never installed correctly unfortunately.

In this instance I would code it as a C2 and quote to install a 500mA RCD for fault protection for the circuits that do not meet the maximum permitted Zs via the MCB.

Remember the RCD will need to be installed at the supply end of the cable.

No need to TT it and make the earth even worse.

What was it you disagreed with in my posts Essex?
 
In this instance I would code it as a C2 and quote to install a 500mA RCD for fault protection for the circuits that do not meet the maximum permitted Zs via the MCB.

This is only viable if the problem is not degradation due to damage to the underground cable.
Proper testing needs to be carried out first rather than the clutching at straws and repeated EFLI tests that appear to be happening.

I wouldnt be entirely surprised if it turns out the op is getting poor results due to using a low current test.
 
This is only viable if the problem is not degradation due to damage to the underground cable.
Proper testing needs to be carried out first rather than the clutching at straws and repeated EFLI tests that appear to be happening.

I wouldnt be entirely surprised if it turns out the op is getting poor results due to using a low current test.

The op has stated that the EIC was over the max Zs anyway. It was never installed correctly so some sort of change is required to meet max permitted Zs.
 
This might seem a bit unorthodox but I always like to find out what the actual problem is before coming up with a solution

The problem is Zs higher than the maximum permitted for the OCPD installed.
 
It'd be useful to know how old the installation is.
 
It was never installed right in the first place.

It would be good if the OP could clarify the test results and what they mean by original values. Their other threads recently about this same job make me think these original values refer to the EICR conducted before they started the remedials rather than referring to an EIC.
 

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