Tails upgrade

[Davem]

Hi, just a quick question I am upgrading a cu and partial rewire. Now the tails from the cutout are 16mm and go in to a teleswitch, they then comeout and go in to a multiwatt reader then in to the ccu. Obviously I want to use 25mm tails after the meter so do I get the electric board out to upgrade there part? Can the teleswitch be removed by them ? At my house supply comes in to cut out into meter then in to isolator then in to cu.! Any advice appreciated I am new to the game also so be kind

 

[kingeri]

So if the cable carrying capacity is less than 60amp I'm sound anything over then an upgrade is required?? Just to clear things up cheers for help guys.

It's no different to working out the cable size for a final circuit. If you know the CCC of the tails, and that it is protected by an appropriately rated fuse, then you're good to go!

 

[Octopus]

The OSG insist on 25mm tails.. But remember this is a guide.. check cable carrying capacity for size of tails and that decides wether your tails need upgrading or not

They show 25mm tails,but remember that the OSG is aimed at new installs..... if it covered all the types of installs over the years it would be as big as the encylopedia britannica

 

[GLENNSPARK]

They don't really 'insist' as such. I recall people on here saying it all stems back to the drawing of a standard arrangement in the onsite guide.

yeah....you mean the one opposite the other one showing a TT...with 16mm CSA main earthing....lol..

 

[bigbaddave]

So if the cable carrying capacity is less than 60amp I'm sound anything over then an upgrade is required?? Just to clear things up cheers for help guys.

From memery im sure 16mm tails are good for 80 ish amp.. Providing main fuse is 80 or less and tails are in good nick then why upgrade?

 

[Davem]

Cheers lads helped me out no end appreciate it. This forum is perfect for new starters like to t get advice from your more experienced lads cheers

 

[somersetsparks]

Cheers lads helped me out no end appreciate it. This forum is perfect for new starters like to t get advice from your more experienced lads cheers 

Another happy customer, would it trouble you to fill out a quick feedback form on your experiences of the forum today? Only joking ;-)

 

[GLENNSPARK]

Another happy customer, would it trouble you to fill out a quick feedback form on your experiences of the forum today? Only joking ;-)

what are you snuffling for?...lol..

 

[somersetsparks]

what are you snuffling for?...lol..

No very often we get happy customers Glen!

 

[GLENNSPARK]

No very often we get happy customers Glen!

hmm...i wonder why....

 

[guest119]

The main tails are prob 16mm because the fuse is 60/80.
The fuse is 60/80 because that is the rating of the tele switch (guessing it doesnt say 100a on it)

 

[Phoenix]

It must depend on the DNO. I called out EDF to change meters (customer had economy 7 meters and didn't want that tarrif), I had installed new CU with 25mm tails to old meter, 60A fuse, when I returned they had also changed their old 16mm tails from head to 25mm. I was surprised they even changed the meter, let alone the tails!

 

[GLENNSPARK]

It must depend on the DNO. I called out EDF to change meters (customer had economy 7 meters and didn't want that tarrif), I had installed new CU with 25mm tails to old meter, 60A fuse, when I returned they had also changed their old 16mm tails from head to 25mm. I was surprised they even changed the meter, let alone the tails!

they may have changed the bullit...

 

[Phoenix]

they may have changed the bullit...

True...it was all re-sealed, but on a 2 bed house I would have thought they'd have left it as was, but a valid point, thank you!

 

[soulman]

I was told by elecsa that all tails on ccu upgrades (domestic) must be 25mm no matter what size fuse. Which I think is a bit silly on small flats or houses.

 

[Geoffsd]

Not only silly but wrong.

Table 4D1A.