A little assistance please Re: TT System, 0.21 ohms on Earth Rod.

[Rockingit]

Ermmm...is it too obvious a question to suggest that this might be an OLD cable running to an OLD rod/pipe/creaking stair/whatever and the property has had a PME upgrade?

 

[Spazz]

I know that TN-C is restricted in this country - but we dont know what type of property it is or what it was used for

With the Ze - you have a resistance on the cable - yes I only know that its a very small resistance but might be enough to detect on the Earth Loop Impedance meter. - it may give an idea - the other option is always disconnect the bonding cable off the water pipe and do one on that - that will show the Ze of the pipe as an earth rod - it will either be the same or different - if its the same its using the water pipe - different there is a rod somewhere or its TN-C-S.

I have never come across a TN-C either - was just a suggestion

 

[1shortcircuit]

Here we go, I've uploaded a few pictures that I took at the time that I was having a little poke around :thumbsup

 

[Guitarist]

How did the Big Country song go??? "Walk away, walk away...."

My favourite photo is the one with the pipe lying on the ground...

 

[Richard Burns]

Interesting, looks like the room/hall with most of the photos is an change/extension to the original building, photo 14 shows that the earth and water(?) bonding are very close. (nice lead piping!). I would say that the earthing was committed under the floor with the lead piping.
Sorry, the earth rod would be just by that wall and rod (if any) is under the floor by the water pipe (or IS the water pipe).

Can you trace the bonding from the water pipe to where it goes up through the floor and see if it is connected to the earthing conductor?

 

[Had8Lives]

Simplest way to find out if the bare main earth connects to the water pipe is to turn off the main switch, disconnect the bare earth from the board and test for continuity to the water pipe :-D With regard to RCDs, suggest to the customer the installation of one 30ma RCD in the main tails (the live one looks like it's perishing at the main switch anyway) on the basis that putting the RCD in will cost less than a compensation claim or the death of a tenant from electricution.