On Sat, 15 Sep 2018 17:56:18 +0100, John Rumm wrote:

That seemed to be a response after testing lots of cheap chinesium
extension leads and finding that under high loads they would fail
catastrophically.

Was looking at short (1 or 2 m ish) 4 way "extensions" in Tesco. The
first thing that I noticed was the flex was only about 5 mm dia, then
saw the sticker "10 A Fuse Fitted".

The 10A fuse will still likely carry 13A indefinitely, but will limit
the scope for overloading as far as a 13A fuse would permit.

A 13 A fuse lasts about 1 1/2 kettles full (5 mins?) when sharing
with an urn... load of 4 to 5 kW (16 to 20 A)

--
Cheers
Dave.