Christian McArdle wrote:
TT doesn't need the large earth conductor sizes that TN-C-S (PME)
requires,

P.S. The On Site Guide has the required dimensions for TT (which vary
depending on whether mechanical protection is available). But, as I said, if
this is a new install, use the TN-C-S sizes.

It's not a new install. I have the OSG too, I should have looked in
there, thanks!

--
Chris Green