Mains cable to consumer unit top floor flat

[JJONESY4]

Im starting a re-wire of a top floor flat, they have run an 16mm T&E with a 6mm earth from the ground floor to the 3rd floor feeding the CU, replacing this cable is practically impossible as there is no way of getting down without going through other flats. Looking for some advice of how others have gotten around this?
Do I fit a small board at the main incoming downstairs and protect the cable with a time delayed RCD?

 

[westward10]

Yes no RCD protection

Submain is fine so needn't be included in the installation.

 

[cliffed]

sub main looks like it will need Rcd protection, the other issue is the size of the cpc which will be ok if MBPC are not required at the Flat.

 

[littlespark]

The only reason it may need rcd protection is if it’s buried <50mm inside the other flats, and we don’t have that information.

It’s no different than regular meter tails in terms of mechanical protection… it’s just a long length, which is taken care of by the 60A fuse.

 

[DPG]

OP - is this T&E run on the surface or in conduit all the way? Or is any of it below the surface?

I'm guessing not as you were talking about changing the cable or adding RCD protection.