upgrade meter tails, or downgrade main incoming fuse??

[martinsayer81]

hi guys

hoping you could give me your thoughts,

i am pricing for a consumer unit change, its an old fuseboard with re-wireables.
it has 16mm meter tails, but it has a fairly new looking 100A main fuse.

its a small-ish house..... 2 ring mains, 2 lighting radials, a couple of sockets in the garage, and an immersion heater radial,

i was wondering whether or not i could just down-grade the main fuse to a 60A and keep the existing 16mm tails( no damage, or signs of overheating or burning)
or whether i have to leave the fuse at 100A and fit 25mm tails?

there's no electric shower or oven,

i would appreciate your advice

many thanks

 

[danf1966]

where is pic of TT with 16mm main earthing must be something wrong with my eyes.

 

[GLENNSPARK]

its the diagrams of earthing arrangements danf.....

 

[danf1966]

Have a proper look glenn..........i dont see it

 

[Engineer54]

aye and it also shows a nice diagram of a TT system with 16mm CSA main earthing....lol....

That's for those rare occassions where someone has actually provided a real TT system, with a sub 1 ohm Ra, which is by the way obtainable in many areas of the UK...

The trouble being the BGB going and spoiling everything by giving a max of 200 ohms!! Which a 2.5mm wouldn't have any problem with!! lol!!