high r1+r2 and low IR

[jat01]

Cu change, one a pre work assessment and getting high r1+r2 reading on ground floor ring, 3.5ohms at one socket, also ir on to ring gives less then 1 meg ohm one line to line.

The opened socket, looks like a spur from another socket. Am going back there tomorrow to pull up Floor.

Tns earthing

Any advice?

 

[m4tty]

What do you mean line to line on IR? Testing between live and neutral ?

 

[karlb]

Im guessing he means he did a ir test between the incoming And outgoing line legs of the ring

 

[jat01]

Sorry , ir live to neutral less then 1 meg ohm also same results for line earth and neutral to earth.

 

[m4tty]

What was the reading exactly. Something may still be plugged in hidden somewhere ?

---------- Post Auto-Merged at 17:07 ---------- Previous post was made at 17:06 ----------

If it shows less than 1 meg on IR then switch it to continuity toget a more accurate reading then it'll give you some idea what if anything is still plugged in

 

[loonytoon]

^^^^ What he said ^^^^

Try looking for hidden appliances in kitchen?, cooker hood?, TV amp in loft?, Boiler spur?

 

[Theorysparky]

i wouldnt pull any boards up just yet

find the source of the spur half split to find the leg

you have 3.5 ohm at one socket ??? what about the rest

what are your continuity readings ???

Im with Matty on this more testing required

or more results need to be shared

 

[Ian Speirs]

Is the circuit you are testing isolated from the consumer unit, or are you testing at the socket and splitting the ring there?

 

[ProDave]

#1 test before you go any further is end to end on L N and E

If those are okay then the high r1+r2 must be a dodgy spur.

Have you done end to end? if so what are the readings?

 

[steptoe]

in the voice of that big bearded bloke,

GORDON'S ALIVE

 

[jat01]

End to end readings

r1=0.18 ohms

rn=0.18 ohms

r2=0.52 ohms

IR readings 500v

Live-live= 0.36 meg ohms

Live-E=0.25 meg ohms

Circuit covers the whole ground floor including kitchen. Did check to see if everything was disconnected and did not see any neons.

Another thing I noticed was that when I did the continuity reading on the double sockets. plug the megger into a socket outlet I get a good reading but when I plug the megger into the second outlet on the same socket I get a higher reading or the reading starts high and then slowly gets lower. Any ideas why???

They sockets look like they were replaced about 8-10 years a go and only have one earth point.

 

[Smilers]

Brian Blessed?

 

[batty]

Its a Megger.

ROTFWL

 

[kme]

in the voice of that big bearded bloke,GORDON'S ALIVE

:slap :slap

Ming, ming - must be the batphone, `cos its "minging" ]

End to end readingsr1=0.18 ohms

rn=0.18 ohms

r2=0.52 ohms

And you`re ok with those then?

I`d be thinking the cpc had a poor joint, TBH!

IR readings 500v

Live-live= 0.36 meg ohms

Live-E=0.25 meg ohms

I assume you refer to L-N? there aren`t many domestics (yet) with polyphase loads, and even less with a polyphase ring circuit.

What was N-E?

You DO know that "something plugged in", if it contains electronics, may be dead as a dead thing now, `cos you fried it?

Circuit covers the whole ground floor including kitchen. Did check to see if everything was disconnected and did not see any neons.

They were all in the aquarium.

I`d hazard one of two possibilities:

1. Fault in the ring, including the presence of dampness somewhere.......

2. Other (more testing required)

Another thing I noticed was that when I did the continuity reading on the double sockets. plug the megger into a socket outlet I get a good reading but when I plug the megger into the second outlet on the same socket I get a higher reading or the reading starts high and then slowly gets lower. Any ideas why???

They sockets look like they were replaced about 8-10 years a go and only have one earth point.

See batty`s reply mate:

Brian Blessed?

Awwww, Bless(ed) !!!!!!!!! "The big, bearded bloke" :slap - who does the intros on the daft Japanese "gameshow" thingy? ROTFWL

Its a Megger. ROTFWL

:Chair fall ] Guinness :C

 

[ProDave]

Try your R1+R2 test on the terminals on the back of the socket. If you then get a good reading (where you had a poor reading with a plug in test lead) then you have a dodgy socket.

And I'd also be looking for a dodgy earth connection somewhere, that CPC continuity is too high.

 

[steptoe]

is it a 1mm cpc on a 2.5 L+N ?

wouldnt be so far out,,,,,, still high though.

 

[Theorysparky]

TBH i wouldnt be worried att with the high cpc reading

he has a bad socket

seems to me there are a few small individual faults making it look worse than it is

damp socket,,,,,,dont just look under the sink look for a socket downstairs thats below a bathroom !!

i have had that twice !!!

 

[ProDave]

damp socket,,,,,,dont just look under the sink look for a socket downstairs thats below a bathroom !!

i have had that twice !!!

Or a socket in a damp wall. You know the ones where the back box is so rusty it disintegrates when you try to unscrew the front, leaving you wishing you have never touched it.

 

[paul b b]

Last fault I found was a socket hidden behind a rad. some one had spured off it, fitted a blank plate and put a rad over the top. only they never tightened them enough. so take a peek with a torch to see if there are any hidden sockets anywhere.

 

[samson337]

I had this yesterday. Loose terminals all over r1- 0.35- r n- 0.58 - r2 - 1.19

All sockets were naff- replaced a few, screwed up the rest.

So after sorting it all out -

r1- 0.34- r n- 0.33- 0.67

And make sure you un plug every thing even if it take you for ever, and ever to find every thing