main earth upgrade on tt

[opm electrical]

i know on a TN system i have to upgrade the earth cable to suit if i do any work, normally 16mm on domestic but what about tt, the job im looking at has a 6mm main earth to the rod and it is not buried, is there any obligation to increase it?

 

[Spudnik]

No, but it should be changed to green/yellow, if it isnt already.

However, i always fit 10 regardless, with 6mm main bonds.

 

[opm electrical]

thanks jason, i just thought id better check, its already green/yellow and the bonds are 10mm, im gonna go back before i finish the quote and check the Ze just in case