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Hi,

Got called to a customer today, background is he has been doing some DIY... he had replaced a load of light fittings and plug sockets, he said we extended this one here and burried it in the wall etc... found one twisted together with tape, no connectors etc... anyway..

The problem is, since yesterday, he said the plugs downstairs don't work... hmmm

I plugged the socket tested in, beep beep beep beep beep, Earth and Live Reverse.... so i go to another, and get the same, then go to another, and its already beeping at me without switching the switch on, its a Fluke socket tester, first two are lit up, then switch it on then its just the first one so suggest Live earth reverse.

I then get the MFT out, plug it in at a socket,

Line to Neutral = 5.5v
Line to Earth = 230v
Neutral to Earth = 230v

Hmm, that's not right...

I pulled off all the face plates down stairs that I could that appears to be on that circuit one at a time thinking ill find the problem, but nope, nothing, all seemed in order (a mess but in the right holes). They said they did not extend or chop any circuits on the plugs, only the lights (they work fine).

Oh its a radial by the way.

So then the lounge, I took the faceplate off, left all conductors hanging (terminated in wagos) turned back on, same problem on sockets, but the ones he had changed were all dead, so im thinking must be somewhere else, put it back together.

Looked at the consumer unit, dual split board, a mess, blatant cowboy who fitted it, everything in the wrong places etc, but anyway, RCD protected. So the circuit was holding fine, as was the RCD.

I put a jumper between Line and Earth and then went round the sockets to get an R1+R2, all seemed pretty much in order, went round everything I could find, all seemed to be ok.

Then hooked Line to Neutral, went round the sockets, not a bloody sausage, nothing, not on any socket anywhere, nothing hooked off the circuit.

Then hooked Neutral to Earth and got a reading on everything.

So then I thought, well everything appears to be in the correct places so what the hells going on... I said it Friday night, I want to go home now thanks, and am going back next Tuesday and have left the circuit off.

My next step is to remove all faceplates on the circuit, so perhaps 15 say, then try to connect one at a time and see what happens.

Has anyone got a better suggestion as ill be honest, im stumped on this, I normally find these things quick and move on, but I spent 2.5 hours then this evening and couldn't work it out.

He assures me he has only changed Faceplates, only 4 of them down stairs in the lounge, you could see they were new. He has not touched anything else on the plug circuit.
 
Whatever it is thats in the wall wants disconnecting anyway , if you have identified all points on that circuit that is , I would run another leg out and ditch the faulty leg , at the JB , see whats not live after that , as said do a temporary at first ,
 
Thats the issue, the juntion box doesnt seem to go to the CU... bugger it!

I think ill order a tracer tonight!, see my other thread, any views as to which?
You said that you had line and earth continuity back to the CU from all the sockets, therefore you should be able to get line earth continuity from CU to this junction box, if you cannot get continuity then this junction box is not on that circuit!
 
Yes the junction box, its just where the boiler is cut into it, I have continuity there for line and earth, but no neutral, but unfortunately the cables go back away from the CU and cannot seem to find the one from the CU to the first point.

I have a nasty feeling its the cable the DIY'er is telling me is buried in his newly skimmed archway.

I feel I need another pair of eyes looking at this as someone else may spot something I have missed. I have definately narrowed it down some what, but cannot find the cable that I have narrowed it down to!

I don't particularly want half the house floor up looking for it as the place is full to the brim.
 
The r1 reading at the point I beleive to be the first point is 0.13 ohms, from the CU to that point, it could easily be 12 - 14 meters maybe. I have tried every outlet, switch and socket, and that's the lowest one, which is the first one in the extension, so it is quite possibly the one, the rest increase up to about 2.3 ohms, and if you plot if round you can see them increase round the way I think they go.
 
I dont think I have made myself very clear...

the junction box is not the first point, but it is the nearest point to the CU at only 2.5m away. It is the radial with the boiler cut into it.

The nearest point / socket is approx. 12m away, I presume this is the first point as it has the lowest resistance on the line conductor compared to all of the others.

One thing I could do, but not too sure if its such a great idea, is just disconnect the feed from the CU and just run a new leg up to the junction box as I know everything has continuity from that point, but this would leave the bad leg in place and live.

How would you feel about doing that? Ok its the easiest quickest way but does it comply? it would not be a radial, but more of a lollipop shape...
 
Hi,

Just popped back with the new tool Martindale CD1000, found the problem within 30 mins.

this is a downstairs plug circuit bare in mind.

Upstairs socket in one of 5 bedrooms, he had changed a LOT of faceplates round the house, anyway, one socket in a bedroom, three cables into it for some reason, so a random socket with a spur coming off it i guess, anyway, jist of it is, one of the neutrals had not been connected, it was sitting at the back of the back box....

DAMN DIYER'S!!!

But the CD1000 foudn it as it was squealing away then it stopped, worked a treat and without it i would have literally had to remove any faceplate.

Problem solved
 
Hi,

Just popped back with the new tool Martindale CD1000, found the problem within 30 mins.

this is a downstairs plug circuit bare in mind.

Upstairs socket in one of 5 bedrooms, he had changed a LOT of faceplates round the house, anyway, one socket in a bedroom, three cables into it for some reason, so a random socket with a spur coming off it i guess, anyway, jist of it is, one of the neutrals had not been connected, it was sitting at the back of the back box....

DAMN DIYER'S!!!

But the CD1000 foudn it as it was squealing away then it stopped, worked a treat and without it i would have literally had to remove any faceplate.

Problem solved

It's easy with the right tools in the armoury
 

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