Unsure About An Old Earthing Arrangement

[Wilko]

Hi - TN-S of that value is is within the normal range for SSE (happen to know). But I would not stop till I found the cutout and eyeballed the tails and earth strap. Happy hunting

 

[GLENNSPARK]

The supply to the house has an earth connected to the side of the house about 4m roughly above the meter, however no earth is present at the DNO's fuse/meter. Therefore I am unsure of where the earth goes from the fuse box without tearing the wall apart and searching through the cavity (a rather drastic and silly idea I think you'd agree).

And yes I did disconnect the cable before measuring.

I suppose it's technically possible that there is a separate MET hidden somewhere in the house, and that the earth wire from the fuse box goes there and then bonding from that MET is messing up my reading. However there is no separate MET anywhere for a few meters in any direction from the fuse box, there's no record of anything left from anyone who's previously done any work on the property, the owner isn't aware of another MET (not surprising), and so if there is another MET hiding somewhere my chances of finding it with the house still furnished... Well I'll take the needle in a haystack any day.

So what your saying is that there's a G/Y jointed onto the supply cable before it enters the property?

 

[GLENNSPARK]

Just check that it's not a shared supply...looped from this to next door....or vice versa

If it is then you can count out the supply cable being a CNE

 

[GLENNSPARK]

Is it a cast iron cutout...coming of a paper-lead?

If so then the main earthing could be picked off the cast cutout with a short stab of earth to the MET

 

[westward10]

you're right in that it was common for the earth bar in the fuse board to be used as a MET up till 16th ed ( 1991).

Can't the earth bar in a CU be used as the MET?

 

[Midwest]

I do lots of time.

 

[westward10]

I do lots of time.

That's what I thought.

 

[Deleted member 26818]

0.56 ohms is ok for TN-S.

 

[westward10]

0.56 ohms is ok for TN-S.

Good question DNOs will quote typical values of 0.80 for TN-S and 0.35 for TN-C-S but these are not hard and fast and often quoted for new builds. Older networks may often exceed this.

 

[Deleted member 26818]

Wasn't a question.
Was a statement.