Fault problem with up ring

[swaley]

got called out to a job yesterday. Upstairs ring Mcb not staying on. Done a quick visual took all sockets off didn’t notice anything out of sorts. All appliances unplugged only other thing on ring is boiler programmer off a fuse spur. So I split the ring did IR and one side was showing a low reading. I energised the good side and starting the tedious process of trying to find the culprit on the dead side. I came across 1 leg between 2 sockets which was giving me a reading of o.52 ohms IR. so I disconnected the link between and energised both sides. Voila mcb stays on. My concern now is I have a socket in hallway and boiler programmer with no power. Even though both legs are in board? And 2 sockets in another bedroom showing 60v output. I’m baffled didn’t have time to get boards up need to go back. Surely by disconnecting 1 faulty link I would in principle have 2 radials?? tenant just moved in recently new carpets fitted and it’s been intermittent tripping. Any ideas guys

 

[Squid]

Did you ask the customer the following question "have you had any work done in the last month/anyone messed with the electrics"?

 

[Pete999]

The IR was o.5 at disconnected part. I’m going back Saturday now so will update when I find out a little more. A nail from carpet gripper is always a possibility

0.5 what?

 

[swaley]

Did you ask the customer the following question "have you had any work done in the last month/anyone messed with the electrics"?

Here we go all the bright sparks are gonna jump on board.

 

[swaley]

0.5 what?

I ain’t gotta prove anything to you. You obviously know the answer

 

[swaley]

When fault finding between all 3 cores and 500 v is the only way to do it.

Ok murdoch because of the low reading I automatically presumed the problem was the link tested. But point taken

 

[Pete999]

Here we go all the bright sparks are gonna jump on board.

Not at all Mate 0.5 could mean anything, would be better to say what units you mean to save any misunderstanding, and as for your comment all the bright sparks are going to jump in, because we know the answer, that's not true, it's your error for not explaining the units you got from your test results, none of us know every thing, and we aren't all mind readers either, so pick your toys back up and grow up.

 

[swaley]

Not at all Mate 0.5 could mean anything, would be better to say what units you mean to save any misunderstanding, and as for your comment all the bright sparks are going to jump in, because we know the answer, that's not true, it's your error for not explaining the units you got from your test results, none of us know every thing, and we aren't all mind readers either, so pick your toys back up and grow up.

I don’t like sarky comments. It was a IR so being the competent sparks your are I presumed you would know the answer. You didn’t add anything constructive. But hey ho I’ll get to the bottom of it in the end. I’ll make sure next time I post I spell it out to the precise detail not to offend anyone.

 

[Pete999]

I don’t like sarky comments. It was a IR so being the competent sparks your are I presumed you would know the answer. You didn’t add anything constructive. But hey ho I’ll get to the bottom of it in the end. I’ll make sure next time I post I spell it out to the precise detail not to offend anyone.

That's good then.

 

[Octopus]

Ok murdoch because of the low reading I automatically presumed the problem was the link tested. But point taken

I still think we are at cross purposes ....

When I mean all 3 cores I mean you need to test, at 500 v the following:

L - N
L - E
N - E

and yes test the disconnected link first, then when at the board, make sure the N is disconnected from the CU and the CPC is connected ....

 

[DPG]

No need to chuck the teddy out of the pram. You mentioned 0.5R - but maybe you meant Megohms?

It's not people being sarky, but needing good information.Things like '60V at sockets' and not stating between which two points you are measuring IR are not clear pieces of information.

 

[Octopus]

Just a thought but you mentioned a boiler programmer, I'm assuming you isolated the supply to this ...

 

[telectrix]

I don’t like sarky comments. It was a IR so being the competent sparks your are I presumed you would know the answer. You didn’t add anything constructive. But hey ho I’ll get to the bottom of it in the end. I’ll make sure next time I post I spell it out to the precise detail not to offend anyone.

before youchuck your teddy bear out of the pram, pete's post was relevant. in you OP you stated 0.5 ohms on a IR test. that's crap. IR test cannnot read that low.was it not 0.5 Mohms? give us the right info, we can help.

 

[Deleted member 9648]

Is there an RCD? If there is and only the mcb is tripping that would suggest a L-N fault.....No RCD it could also be L-E

 

[MJPD29]

Ok
Is the 0.52 mega ohms or 0.52 ohms? Even at that it shoudltn trip an mcb

 

[buzzlightyear]

A nail from carpet gripper is always a possibility

6inch maybe but I doubt it.