What do you call this as?

Goody · May 10, 2011

I came across this in a house and I am sure it’s TNS system. The earth seemed to be 10mm but could not figure out where it goes, I have checked, it certainly did not go into the CU. Don’t know what the hell the DIY’er did with it.

Have a look at the pictures!

[ElectriciansForums.net] What do you call this as?

telectrix · May 10, 2011

possibly goes to gas and water. DIY man having read the readers digest " how to change your consumer unit" but missed a bit.

Adam W · May 10, 2011

... So are you saying the installation isn't earthed?
Have you tried a Zs?

Goody · May 10, 2011

NovusSparkus said:
... So are you saying the installation isn't earthed?
Have you tried a Zs?

I just did a visual; did not dare to open it for now.

Adam W · May 10, 2011

You could do a Zs from a socket.
I'd turn the power off and have a look in the cu to see if the main earth has managed to find its way in.

IQ Electrical · May 11, 2011

NovusSparkus said:
You could do a Zs from a socket.
I'd turn the power off and have a look in the cu to see if the main earth has managed to find its way in.

Don't assume all is well if the socket Zs is fine, you're probably relying on bonding conductors for that reading-fine until the water supplier changes to plastic in the street!

You need to eliminate parallel paths and identify an effective means of earthing (or not).

Adam W · May 11, 2011

It's a good way to check if there is any earth present at all though, at least until further investigations can be made and/or remedial work carried out.