Andrew Gabriel wrote:
In article ,
Dave Plowman writes:
In article ,
The Natural Philosopher wrote:
OTOH are you sure that you haven't come across a bit of the old
7/029 used around then - seven strands of 29 thou copper that was
usually tin plated - this was a pre-metrication standard.


ISTR that was pretty standard in most house in the '15A round pin
plug ' era...

It was also used for the best part of 20 years for ring mains, too.

Yes -- one of the design aims of the 30A ring circuit was easy
conversion from a 15A radial system (by making the ring start
and end at two existing 15A outlets, converted to 13A of course).
Hence the two schemes used the same cable (and you were allowed
to keep the two 15A fuses at each end of the ring early on too).

What's the story behind the switch from 15A to 13A sockets? Surely 15A
would be more useful....?