16sq or not

Looks like you had the same ESB guy as me. He connected my tails in May. If he says the tails need to be upgraded to 16mm^2, then they are probably only 10mm^2. I would ask the RECI you used first, letting him know the ESB flagged the tails as not being 16 and see what he says. If no joy, you will need another RECI to confirm, but maybe someone here will confirm.

All I can say is my old tails were red and black in grey sheath and they were 10mm^2. The new tails are 25mm^2 armoured and come in brown, blue yellow/green. The earth is 10mm^2

did you get a certificate and test record sheet for your rewire ,

A short cut looks to have been taken ,

Agreed, red and black in 2024?

Even if the tails are 10mm2, the length is only 300mm or so. It doesn’t give rise to any practical issue on a 12KVA supply.

10mm2 directly clipped is good for 60A, and indeed this is likely the same cable size used within the consumer unit.

Esbn engineer is most likely to be right about cable sizes

Irrespective,if a rewire was done then he should have upgraded the mains as part of this

there doesn’t appear to be any surge protection on your distribution board (regulation at the time)

also,is your distribution board in a press?

too should get the original rec back to do this

more bad news for you , your lighting circuits should be on a dedicated RCBOs ,

Not on a main RCD ,

Bit of a **** show , I’m afraid

for a rewire 16mm is a requirement

Brown and blue are also a requirement for a rewire (you shouldn’t leave red/black otherwise it’s not a total rewire)

the engineer also recommended moving the esbn cutout as part of it is inside the new distribution board. The rec that did this really shouldn’t have. I do see a 10mm earth connected into the earth/neutral link though so the smaller earth cable outside was the original earth.