6mm Supply

skay · Apr 8, 2014

Saw a consumer unit on a top floor flat today which currently has what looks like a 6mm t+e cable as the supply on a 60a fuse.

Meaning the earth is probably only 2.5mm. Now this has always been here and probably been done by the supplier i guess?

Your thoughts please.

jackhammerJIM · Apr 8, 2014

skay said:
done by the supplier i guess?

You have seen the job it is us who will be guessing .

if there is a 60 amp switch fuse on the ground floor with twin and earth outgoing the DNO won't have installed it . your post needs more detail . have you verified fuse sizes , cable sizes ???

Octopus · Apr 8, 2014

there are 10's of thousands like this in the UK - your point or question is???????

MDJ · Apr 8, 2014

teeth, pulled, no anethestic,finger nails, pulled, chinese burns, lmao

skay · Apr 8, 2014

I need to change this consumer unit. Unless I can get a 40a main fuse what am I to do. Sign it off and leave it as it is?

Badged01 · Apr 8, 2014

Is the question you have a 60A fuse protecting 6mm T&E 'tails' and you want to know if this is OK?

skay · Apr 8, 2014

Well more the cable and earth being undersized??

Octopus · Apr 8, 2014

Are you 100% sure its 6mm T&E?

Badged01 · Apr 8, 2014

Haven't got my books (and cant be bothered digging them out) but I reckon a 60A fuse is too big to protect the 6mm 'tails' so unless you can convince yourself that there is some downstream protection to prevent the tails being overloaded they aint man enough for the job!

If you're changing the CCU then upgrading them would be a good option.

skay · Apr 8, 2014

Yeah pretty sure it's not 10mm. Plus someone done a PIR recently and has put down it being 6mm.

This is a 3 rd floor flat and getting and new 16mm feed up to the door is not going to
be easy.

Octopus · Apr 8, 2014

How far is it from the DNO head to the board? Is there a switch fuse you've not seen as yet?

uksparks · Apr 8, 2014

What wrong with replacing the legend 6mm with something bigger? If not possible, walk away it's not worth the hassle.

shanky887614 · Apr 8, 2014

skay said:
Yeah pretty sure it's not 10mm. Plus someone done a PIR recently and has put down it being 6mm.

This is a 3 rd floor flat and getting and new 16mm feed up to the door is not going to
be easy.

? how is it not easy.

swa clipped direct along staircase, through wall and into flat.

(by clipped I mean cleats)

ferg · Apr 8, 2014

I don't normally get involved in these threads but I need to get shot of the annoying message.

TBH I think your biggest problem might be not being able to tell the difference between 6 and 10mm T&E.