Renovated house low r2 readings !

[Soulsurfer]

Just been sorting out a right mess during a house renovation and tests on newly installed ring final are r1 0.35
rn 0.35 & r2 was expecting around 0.58 but had consistently 0.00 Ohms.
MFT was zeroed again from scratch and was still giving a zero resistance reading
Almost all cable is new and IR tests all perfect. Any ideas ? Thanks

 

[Soulsurfer]

What was it?

Extended most of the circuits from old 3036 board to new board and used a box with din top hat mounted creating a huge earth bus bar in effect felt a right prat

 

[Soulsurfer]

 

[Midwest]

Ha, nearly always the simplest of things. At least you found it.

 

[Soulsurfer]

View attachment 36715

It's tidier now by the way !

 

[Soulsurfer]

Ha, nearly always the simplest of things. At least you found it.

Thanks all, another silly but helpful learning day ! What a prize numpty eh

 

[Toneyz]

Vort was almost right in post 2

 

[Pat H]

I'd disconnect the 13A sockets each side of the CU and then measure R2 end to end from each socket. One test round the ring. The other test to and from the CU. With the CU CPCs for the RFC still disconnected at the CU.
That should give a sensible remainder of ring R2 and isolate the issue in the cables going to and from the CU.
You may need a wander lead of course.

 

[Midwest]

I'd disconnect the 13A sockets each side of the CU and then measure R2 end to end from each socket. One test round the ring. The other test to and from the CU. With the CU CPCs for the RFC still disconnected at the CU.
That should give a sensible remainder of ring R2 and isolate the issue in the cables going to and from the CU.
You may need a wander lead of course.

Ehhh? Soulsurfer has found the 'fault'

 

[Soulsurfer]

Ehhh? Soulsurfer has found the 'fault'

With some knowledgeable help from the gods on here

 

[Toneyz]

With some knowledgeable help from the gods on here

Steady on I would not go that far !!!!!!!!

 

[Midwest]

With some knowledgeable help from the sods on here

Changed that slightly for you

 

[marc8]

Carrying out tests on new builds we have been carrying out, get first test cert over from sparks on site LL & NN look good earth way down low, then remembered metal walls caddy straps light circuits ect.
Few days later same site different sparks phone call same as above been checking everything he tells me I mention parallel paths & phone goes silent the penny drops oh S...t of course.
Not quite as low as fist post but quite low.
See it on the test sheet kitchen all good block walls, tin in the up & downstairs rest of house so 2 rings affected.

 

[NDG Elecs]

Extended most of the circuits from old 3036 board to new board and used a box with din top hat mounted creating a huge earth bus bar in effect felt a right prat

SS, I read this post all the way through thinking what could it be, and you led us on a right merry dance mate! Prat is correct! But we all can't see the woods for the trees every now and then! My initial thought was both legs going through one back box near the CU, with the CPCs joined there, as I have seen that sort of thing before. Well done for, ahem, finding it!

 

[NDG Elecs]

Long as nobody else is in the place, to trip over it or slam the door on it

Or dog chewing through it! Which happened to me once. Customer didn't seem to care either the tawt.. nearly billed them for it..

 

[Flanders]

Extended most of the circuits from old 3036 board to new board and used a box with din top hat mounted creating a huge earth bus bar in effect felt a right prat

Maybe you could add this to the never have i ever thred , we have all done some silly things in the past , at least what you have done is not dangerous and you found what was coursing your low reading before you stripped the installation down back to its component parts .