regulation for 80amp fuse and 16mm meter tails

[baldsparkies]

Where the majority of domestic installs are concerned the chances of overloading a 16mm 1 meter or less, set of supply tails is very unlikely.
These days its the modern showers that are probably the heaviest appliance loads followed by kitchen cooking equipment hobs and the like.
None of which are pulling current for long enough to cause issues.
The only time I have seen problems have been in commercial settings, and usually down to poor or loose connections.
Certainly helps to explain why in the real world you wont see many heat damaged 16mm tails even if they are paired with a 100 amp cut out fuse.

 

[Welchyboy1]

Ive always found this 25mm tails in free air a bit of a nonsense when even new DNO 100a supplies are normally in 16mm concentric cabling

i think the CCC is around 93A

 

[baldsparkies]

Another IMHO valid point is one of flexibility and practicality when working 25mm into a single screwed soft material clamping point.
Those not so sturdily manufactured plastic mains isolators can be very unforgiving and with plastic din mounts and often limited access space in some of these domestic c/u's. 16mm can often result in less mechanical strain and a superior clamp connection.
A good tight connection that's not subject to mechanical strain is as far as I am concerned more important when it comes to the possibility of heat or thermal damage to tails.
In real world scenario it doesn't take a lot to work a 25mm tails loose in those isolators compared to 16mm.
So your damned if you do and damned if you don't.
Oh well !! we can cover the problem up in metal enclosures soon so whoopie dee.

 

[davesparks]

Ive always found this 25mm tails in free air a bit of a nonsense when even new DNO 100a supplies are normally in 16mm concentric cabling

i think the CCC is around 93A

Not round here they aren't, it's 35mm al/cu concentric for all new supplies