High Ze reading fails EICR

[Mike Johnson]

The issue is that I need a valid EICR in a maximum of two weeks, and I'm wondering if there's any chance he could have signed this off as satisfactory, considering that the dwelling's electrical installation is protected by an RCD, which, if I understand correctly, would isolate the system within the required 0.4 seconds in case of an Earth fault.

First why do you need a valid EICR in two weeks? are you letting the property?
The RCD protection will not work effectively/efficiently without a satisfactory Earth.
Looks like your only route is to install an earth rod and delay type RCD as pc1966 suggests.
Your electrician should have issued an EICR with the content noted, this at least shows willing on your part if you are letting out the apartment.

 

[pc1966]

I thought the ESQCR required the DNO to maintain any earth that they provide.

Almost. What it actually says is:

Equipment on a consumer’s premises
24.—(1) A distributor or meter operator shall ensure that each item of his equipment which is on a consumer’s premises but which is not under the control of the consumer (whether forming part of the consumer’s installation or not) is—

(a) suitable for its purpose;​

(b) installed and, so far as is reasonably practicable, maintained so as to prevent danger; and​

(c) protected by a suitable fusible cut-out or circuit breaker which is situated as close as is reasonably practicable to the supply terminals.​

​

The catch is "so far as is reasonably practicable" which I have heard leads to occasions when they simply decide it is not practical / cost-effective to replace something.

 

[westward10]

This is interesting scenario. Seems that DNO are very slow in response to this situation. When I had similar readings on the job they were within couple of hours not months digging outside.
But assuming there is relatively new CU with tails nicely glanded and secured and all circuits RCD protected. The path to earth exist but it's high resistance, which will be rectified by DNO. What danger is actually present to the occupiers with Ze of 14.5ohms
Are the readings within limits - NO
Will RCD provide fault protection within specific time for all circuits - YES
So where is potentially dangerous situation here? Can we not rely on RCD for fault protection in a same way we do on TT, just for the time until repair is done, then revisit and retest?

14.5 ohms today but what will it be in a weeks time. With TT we have a reference for the fault path but can this be compared.

 

[pc1966]

So where is potentially dangerous situation here?

In most cases the risk is low, but seeing 14.5 ohms for a TN earth means that some cable corroded or loose to the point of barely conducting. In the event of a high current fault I would expect that to blow open. After someone resets the MCB/RCBO no more earth and ADS.

Now it might be OK, it might be the cable has opened / corroded through at a far end and really is a 14.5 ohm earth rod now, so it would take the fault energy with only warm earth around it, but it is not known so not something that would make me sleep easy.

edit: beaten to it by @westward10

 

[kropaske]

@pc1966 , @westward10
I take both of you points guys but we only testing on the day and we can't really assume how long this fault was preset, and whether it will get worst in a day or year. We also know that repair is arranged. Whether satisfactory or not, would you leave this installation live and walk away? Why not for example make it satisfactory and schedule weekly visits to verify that connection it's still there untill repair is complete. Would that not be better then just give unsatisfactory and walk away.

 

[pc1966]

Whether satisfactory or not, would you leave this installation live and walk away?

Without knowing enough about the installation the question of if it could be left live is not answerable.

Most probably it can, as this is C2 sort of risk and ADS would work at least once. There might be other risks such as a ground floor flat with touchable class I lights outside on the at-risk CPC system, etc. But the owner & occupier(s) need to know of this, and also what mitigation steps are needed (if any) until it is fixed properly.

Why not for example make it satisfactory and schedule weekly visits to verify that connection it's still there untill repair is complete. Would that not be better then just give unsatisfactory and walk away.

An EICR is a bit like a MOT, a summary of the system at the time of the test being satisfactory or not. Here it is not.

What to do next is a separate issue. As far as I understand from the OP's posts, the electrician is refusing to sign off a satisfactory just now but is willing to come back and do so after that is addressed, which is all right and proper. It seems the pressure for "satisfactory" now comes from some other aspect, as @Mike Johnson suggested probably for letting reasons.

 

[baldelectrician]

There is no effective means of earthing

We get this occaionally and SPEN are quite quick to fix things- although they took a month to fix one in Galston (they assumed the whole install had RCD by glancing, despite more than one property off the supply)

I raised a complaint with SPEN but it went nowhere.

 

[Maarel]

My apologies, let me get this right. The electrician is refusing to issue an EICR, I need the report either if it is satisfactory or not. It’s not for letting purposes but for an application for license I need for next August. The deadline is approaching and if I don’t get it sent in I would have to wait over a year. In order to apply I need all documents. I would have sent in the unsatisfactory EIRC and by the time they process my application Earth will be sorted and Ze retested to satisfactory.

 

[westward10]

There is nothing to stop them issuing the EICR.

 

[baldelectrician]

My apologies, let me get this right. The electrician is refusing to issue an EICR, I need the report either if it is satisfactory or not. It’s not for letting purposes but for an application for license I need for next August. The deadline is approaching and if I don’t get it sent in I would have to wait over a year. In order to apply I need all documents. I would have sent in the unsatisfactory EIRC and by the time they process my application Earth will be sorted and Ze retested to satisfactory.

Just request the unsatisfactory EICR.

Probably better to do it in writing / email etc