8.9M ohms between neutral and Earth

[pan]

Hi, i've just done a second fix on an extension. Whilst doing continuity tests on ring final cct (2.5TE) i found the following. L - N as OL, N - E as OL and L - E as OL this is expected but when connecting Neutral to back box (Butteress) it shows 8.9M ohms. I've taken all sockets off and i get the same result. I'm confused where this resistance is comming from. Any help much appreciated. :C :C:C

 

[Andy™]

most likely dampness if its just been plastered. but id also expect low readings L-N & L-E

 

[rugbymacc]

neon ???? some where

 

[ADS]

Hi, i've just done a second fix on an extension. Whilst doing continuity tests on ring final cct (2.5TE) i found the following. L - N as OL, N - E as OL and L - E as OL this is expected but when connecting Neutral to back box (Butteress) it shows 8.9M ohms. I've taken all sockets off and i get the same result. I'm confused where this resistance is comming from. Any help much appreciated. :C :C:C

Is it just me?

Does everyone else understand this question?Wet Fish

What's OL?

 

[Hawk81]

neon ???? some where

please explain how a neon would give a low neutral to earth? A neon would give a low live to neutral reading.

 

[pan]

Neon spurs were disconnected

 

[pan]

The plasterer was liberal with PVA. I found loads on the cable sheath. Plastering was completed end of May.

 

[sparkytim]

Hi, i've just done a second fix on an extension. Whilst doing continuity tests on ring final cct (2.5TE) i found the following. L - N as OL, N - E as OL and L - E as OL this is expected but when connecting Neutral to back box (Butteress) it shows 8.9M ohms. I've taken all sockets off and i get the same result. I'm confused where this resistance is comming from. Any help much appreciated. :C :C:C

Why have you connected "Nuetral to back box"? :| ?

 

[PC Electrics]

Hi, i've just done a second fix on an extension. Whilst doing continuity tests on ring final cct (2.5TE) i found the following. L - N as OL, N - E as OL and L - E as OL this is expected but when connecting Neutral to back box (Butteress) it shows 8.9M ohms. I've taken all sockets off and i get the same result. I'm confused where this resistance is comming from. Any help much appreciated. :C :C:C

I have some questions, please:

continuity tests L-N, N-E and L-E. Huh? seems odd

continuity N to back box 8.9Mohm. First, why? Second what meter do you use that can read into the megaohm scale on continuity?

and

what does "as OL" mean?

I suspect you might mean insulation resistance tests. In which case, were the neutrals connected to the neutral bar at the CU? And, after disconnecting all the sockets, do you get this result (8.9Mohm) at each neutral to its back box?

 

[davetheglitz]

Hi, i've just done a second fix on an extension. Whilst doing continuity tests on ring final cct (2.5TE) i found the following. L - N as OL, N - E as OL and L - E as OL this is expected but when connecting Neutral to back box (Butteress) it shows 8.9M ohms. I've taken all sockets off and i get the same result. I'm confused where this resistance is comming from. Any help much appreciated. :C :C:C

Silly point - but were all the readings made with both the live and the neutral isolated/disconnected at the CU? If neutral is not disconnected the 8.9M could be from any circuit.

Assume you are measuring insulation from neutral to an earthed back box. I can't understand why you are doing that. If socket and back box are strapped together - same as N-E. If relying on a fixed lug - same as L-E when screwed in.

 

[pan]

Readings were taken with cables disconnected from CU. I used a fluke to read continuity. With live and neutral crossed and all sockets connected. Readings were taken at each socket. I was not expecting a reading from N - E but got 8.9M. I was expecting an open cct. Suspecting the plasterer may have damaged the cable somehow i disconnected all sockets and checked from core of N to back box. a lot of points gave 8.9m ohms. Hence the confusion because I was expecting an open cct instead I got 8.9M ohms. Thanks for looking.

 

[kme]

Whilst doing continuity tests on ring final cct (2.5TE) i found the following. L - N as OL, N - E as OL and L - E as OL this is expected

But those aren`t continuity tests. They`re insulation tests. My fluke won`t show "OL" on EITHER range! Sorry, I don`t understand what you`re trying to measure. What were the following readings:

Ring cct end-to-end L

Ring cct end-to-end N

Ring cct end-to-end E

Thanks

but when connecting Neutral to back box (Butteress) it shows 8.9M ohms.

And you did this why?

I've taken all sockets off and i get the same result. I'm confused where this resistance is comming from. Any help much appreciated. :C :C:C

As per the posts above. When you say "I`ve taken all the sockets off", do you mean you`ve released the plate screws; or you`ve physically removed the faceplates from the wiring?

Plus, in your last post, you say you had live and neutral crossed. Can you explain what you were trying to achieve, please?

Thanks

KME

 

[ElectekAir]

I think that the 'OL' could be from a multimeter

 

[kme]

I fear you may be right mate : headbang opcorn

 

[Nicky Tesla]

but when connecting Neutral to back box (Butteress) it shows 8.9M .

He means, he has taken a reading from the neutral at each socket to the back box at each socket and got the same results.......could be through an rcd maybe...pull the neutral out and recheck.

 

[kme]

He said the neutral is out, Nicky?

Why is "mrs butter" involved in all this, anyway?

Oh. He means Margie ROTFWL

:coat

 

[rugbymacc]

please explain how a neon would give a low neutral to earth? A neon would give a low live to neutral reading.

maybe because the question being asked ... was a tad difficult to understand due to the wording.

and i was just trying to help by opening the question up...

I will keep my gob shut in the future.

 

[kme]

maybe because the question being asked ... was a tad difficult to understandand i was just trying to help by opening the question up...

I will keep my gob shut in the future.

I hope not, mate.

The question was being asked in a rather confused way; and you threw up a suggestion. That is the whole point of this forum; AFAIAA.

I don`t think it was meant the way you`ve taken it. As has been said many times "the only `stupid question` is the one that doesn`t get asked. IMO, that goes for replies, too.

You`re not the first (and won`t be the last) to postulate a theory that, in reality, won`t cause the posted result. I`ve done it myself, as have many others.

Don`t be put off throwing something out into a debate ray

KME

 

[Hawk81]

maybe because the question being asked ... was a tad difficult to understand due to the wording.and i was just trying to help by opening the question up...

I will keep my gob shut in the future.

i certainly did not mean to cause offence. All i was doing was asking how a neon could create a neutral to earth fault so as i could maybe learn. And then stating that i

understood a neon would give a low live to neutral.

 

[kme]

Thanks, Hawk. I didn`t think you`d intended offence -

Unless there`s a wiring fault, it won`t show up N-E - though a load connected somewhere can give odd results....

KME