no continuity on ring final neutrals

[Ladders]

do you want new or old codes well go for old both would be a code 3 requires further investigation , bit curiouse as to why you couldnt get an R1R2 reading when you got a Zs mind ,way to find the fault is to remove all sockets and check connections or more complicated do an R2Rn test around the sockets till you loose the reading

oh to start a new thread double click on general electrical forum then when it opens new thread is at the top

Thank you. I am curious as well why no R1+R2 on lighting when Zs was OK, didn't have long enough ladders with me to reach all the fittings. Think I'm going to get the repair work, so may have to find out! Thanks for the new thread pointer as well

 

[malcolmsanford]

you may have got the Zs on the R1+ Rn.

 

[Ladders]

you may have got the Zs on the R1+ Rn.

Hm, interesting. So therefore I may well need to break the legs down on the lighting circuit to find out where the issue is...

 

[nickblake]

thats a good point malcome has said there is always a posibility there is also a neutral to earth fault or cross connection so you have no continuity to the last on the run cross wire between CPC and the N you then would get the Zs but that would trip the RCD or may just be a combination of a broken cpc and a Earth to Neutral fault but i would have thought that would have tripped the RCD too unless there is a bonding conductor from say a shower to the bathroom light , combined with an open circuit cpc that will give you a Zs as you then have a path to earth via the bonding , this is another reason why you should never rely on a Zs test for testing continuity as you could well have false readings and leave the installation potentially un safe

 

[Ladders]

The lighting is not RCD protected...

 

[nickblake]

well could well be shorting cpc to neutral thus giving a fasle reading best bet is to joint the live and cpc together as you would with an R1R2 test and test at every point till you loose the continuity

 

[Ladders]

Thanks. So to summarise, periodic code 3 for the lighting and then if they want the work doing test until continuity is gone. (Although I did try a couple of points just in case I hit lucky and none of them gave a reading. O boy!)

 

[Gasmeter65]

On a recent EICR I had a ring circuit with no rn readings. It had 2 cables from attic going down the wall, but only 1 to be found in the socket. Traced in using r2 & rn connected method.
Ended up having to junction it and lose the socket as there was no neutral in the socket.
Possibly adjoining room had a socket and was strip connected together and single cable fed through the wall. It is now a bathroom and couldn't access the adjacent socket area.

2nd EICR had no R1/R2 reading in lighting circuit. Traced it to the 1st light on the circuit. An extended cable had a push fit junction box, but the CPC hadn't been pushed in !!

Oh the joys of testing ?

 

[Vortigern]

The thread is a decade old @Gasmeter65

 

[Gasmeter65]

The thread is a decade old @Gasmeter65

But still useful !!

 

[Welchyboy1]

he would have to make the split between the 2 sockets that each have a N from each leg.if that makes sense. i.e cut out the section where the N is broke.

If that’s not possible put the whole circuit on a 20A MCB and note it

 

[loz2754]

If that’s not possible put the whole circuit on a 20A MCB and note it

And leave a potentially damaged cable in service?