Renovated house low r2 readings !

[Soulsurfer]

What's the heating fed from?

Heating has a dedicated rcbo feeding boiler, oil fed on S plan and seperate rcbo feeds immersion element for cylinder.

 

[Soulsurfer]

What's the heating fed from?

Why heating ?

 

[onions1066]

Parallel paths

 

[Soulsurfer]

Parallel paths

From bonding ? All the circuits on seperate pd's

 

[Ian1981]

Is there metal stud work?
Various metal back boxes fixed to metal stud
Parallel paths through various connections and metal back boxes connected together via stud?

 

[Soulsurfer]

Is there metal stud work?
Various metal back boxes fixed to metal stud
Parallel paths through various connections and metal back boxes connected together via stud?

No mate, all old stud and block walls very old granite block nightmare chasing it was

 

[Wilko]

Must be a very short loop you are reading, like a metre or so. You will laugh when you find it

 

[Soulsurfer]

Must be a very short loop you are reading, like a metre or so. You will laugh when you find it

Driving me mad already and NICEIC assessor in 2 weeks !!

 

[Ian1981]

I'd be tempted to split the ring into 2 radials and carry out separate R1 +R2 tests and see if the results go lower to higher as you move away from the db to the furthest point as a way of investigation into the readings your getting

 

[Octopus]

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

I must admit I'm a little puzzled by you opening sentence ... "sorting out a right mess" - so are you testing an installation you didn't do?

If this new ring is your work, it should be a formality to resolve the issue.

 

[westward10]

Need to test at a socket as it sounds like the cpcs are in contact either within or close to the CU.

 

[Octopus]

Need to test at a socket as it sounds like the cpcs are in contact either within or close to the CU.

Yup, first with the CPC's connected to the CU, then again with them disconnected from the CU

 

[The Ghost]

not connecting tight

That would just give max ohms.

 

[Midwest]

Wot about doing the r1+r2 test on each leg, like when your trying to find a break in a ring? Break the ring at the furthest socket, then test each leg? Just a suggestion, might be a pants idea?

 

[telectrix]

i'd be going round with a wander lead on the cpc with the ends separated in the CU..and maybe also at mid-point.

 

[Soulsurfer]

I must admit I'm a little puzzled by you opening sentence ... "sorting out a right mess" - so are you testing an installation you didn't do?

If this new ring is your work, it should be a formality to resolve the issue.

Existing was a bad spider jointed mess have taken out almost all cables except one old leg which I couldn't get out so re-used & all rest is new cable.

 

[Soulsurfer]

Thanks all must be a silly one as mostly new, have wander lead too so I'll try halving and wander etc.. cheers

 

[Midwest]

Have a wander lead myself, but why bother making things difficult, when you have a perfectly good r1 to test your r2?

 

[Midwest]

Suppose you can null the wander lead, to get just the reading for r2. Depends on how far the lead has 'wander' round the house?

 

[Soulsurfer]

Suppose you can null the wander lead, to get just the reading for r2. Depends on how far the lead has 'wander' round the house?]
Wouldn't be near the length as all ground floor & board in garage, lead us 50m so easy enough