16mm T & E used as tails

[Chris C]

Help please, I have just looked at an installation that has been converted from overhead and rod to PME. 25mm tails from the main fuse to the meter then a 16mm T&E to the CCU. I have been asked to upgrade the CCU to 17th edition, do I need to upgrade the tails to 25mm and the main earth to 16mm? Sorry if this has been covered before but I'm a neewbie.

 

[ackbarthestar]

Standard arrangement here would be to size the tails according to the rating of the service fuse and to size the earthing conductor to table 54.7

 

[truckster]

If the Dno have put in 25mm tails I would assume a 100A fuse so yes you would need to upgrade customer tails and earth

 

[Top Cat]

I would go 25mm tails from meter to KMF then depending on run 60 or 80 Amp fuse in KMF. Run 16mm t & e from KMF to new C/U and upgrade earthing.

 

[Engineer54]

What's the distance between the service cut-out/meter position and the CU?? If over 3 metres then an additional swtchfuse will be needed to protect the CU tails....

 

[Chris C]

What's the distance between the service cut-out/meter position and the CU?? If over 3 metres then an additional swtchfuse will be needed to protect the CU tails....

Less than a metre almost back to back.

 

[Top Cat]

Less than a metre almost back to back.

Upgrade the tails then & earthing.

 

[sedgy34]

depends on the size of dno main fuse

 

[ackbarthestar]

I can't believe this, I've just got back with mistress four legs and you are still arguing the ---- about the size of tails. Its so straight forward it beggers belief.
I think I'm going to start charging a commission for my advice

regards
Mr Corporate

 

[Top Cat]

I can't believe this, I've just got back with mistress four legs and you are still arguing the ---- about the size of tails. Its so straight forward it beggers belief.
I think I'm going to start charging a commission for my advice

regards
Mr Corporate

That's what makes it fun!

 

[ackbarthestar]

WTF are you still going?

 

[Top Cat]

WTF are you still going?

I think with a little help we have another half hour of this!

I think 2.5mm tails would suffice!

 

[ackbarthestar]

I think with a little help we have another half hour of this!

I think 2.5mm tails would suffice!

Yea, I should coco....

That should be hot enough to cook the pvc insulation off of the conductors