First time doing an EICR on a flat

[Mark Adamson]

Does seem odd the separate earth block is not used and the earthing conductor goes to the head.

And it all been sealed so

Have they made that cut out to Tncs or is it a a TNS, by looking at the earth met.

I’m not sure as it has been sealed .. didn’t want to break the seals
Will do a Ze from the MET block and see if I get any different reading as so far all the max ef are just over the limit (gn3) table type B 32 1.1 max r1 / r2 1.0 ze.14

 

[timhoward]

And it all been sealed so

I’m not sure as it has been sealed .. didn’t want to break the seals
Will do a Ze from the MET block and see if I get any different reading as so far all the max ef are just over the limit (gn3) table type B 32 1.1 max r1 / r2 1.0 ze.14

You said Ze and Zs@DB were 14 ohms in first post. Which is why I questioned whether there is actually an earth at all (and whether N-E link isn’t there, and if the intent was for main earth to connect to MET)

If that is true your final circuit loop tests are only anywhere near reasonable-ish due to parallel paths.

Maybe it’s me that’s misunderstanding the setup as no else seems concerned!

 

[westward10]

I think it is a typo but you are correct questioning 14 ohm, he has .14 ohm in #11.

 

[buzzlightyear]

If doing a Ze line /earth, what tester are you using.

 

[davesparks]

The orange cable is a split concentric cable providing an SNE (TNS) service, the orange outer sheath denotes that it is LSF cable.

The consumers earth should be connected into the earth block provided, not into the service head. I would guess that an installer misunderstood the type of supply and assumed it was TNCS.
As we all know they rather quickly stopped using TNCS for the distribution within a block of flats as it leads to diverted neutral currents flowing through structural steelwork and other services causing all sorts of problems.

 

[davesparks]

. Orange split concentric often denote SNE systems.

The orange sheath on split concentric identifies it as LSF cable

 

[Mark Adamson]

The orange cable is a split concentric cable providing an SNE (TNS) service, the orange outer sheath denotes that it is LSF cable.

The consumers earth should be connected into the earth block provided, not into the service head. I would guess that an installer misunderstood the type of supply and assumed it was TNCS.
As we all know they rather quickly stopped using TNCS for the distribution within a block of flats as it leads to diverted neutral currents flowing through structural steelwork and other services causing all sorts of problems.

Hi Dave thanks for the info
I revisited the premises to change a cooker switch and redone the test from the MET with MET disconnected from DB still got 0.14 ohms ..