Earthing

[securespark]

On the second one where the supply is a TT and there is a 100mA CPC current triggered earth leakage breaker ( RCCD ) measuring the actual earth current then this is a valid reason to not have supplementary bonding which could divert fault current away from the RCCD and into the earth via a different route thus prevent the RCCD operating.

Do you mean a Voltage-Operated ELCB?

In which case they have been deleted from the regs for nearly a quarter of a century.

 

[wcavanagh]

You need an earth block like this:

5 wires into this block:

1 wire to the earth terminal (the 'collar' on the main supply cable).
Preferably 16mm, although this wire and terminal isn't actually your property, it belongs to the electricity company.

1 to the gas pipe, 10mm
1 to the water pipe, 10mm
1 to the 1st consumer unit, 16mm
1 to the 2nd consumer unit, 16mm

Thank you very much, that makes sense. I will get this sorted tomorrow. Not worried about whos responsablity it is as I ill sort it and I know it is done then.

Thank again for your help.