If one has a small landlord's supply say max load 10A to run hallway lights connected directly to Cutout so 80/100A fuse, does one really need 25mm tails, or is it legit to use something smaller. The reason I ask is because I see quite a few mini CU on 6/10mm tails etc, and 25mm tails seems overkill, though I would argue that fuse is 80/100a therefore tails should match. Your opinions please.