On Tue, 31 Jul 2018 14:10:54 +0100, Terry Casey
wrote:

In article ,
says...

On Tue, 31 Jul 2018 12:02:43 +0100, Terry Casey
wrote:

Some don't accomodate the French earth pin, which means they
are useless in France/Belgium and a few other countries,
others have very thin brass pins and/or only connect to one
Schuko earth contact

Okay for anything double insulated, which includes many appliances.

No. Because the earth pin in the French style connector
protrudes from the socket, a connector not designed to accept
the earth pin won't fit the socket, thus rendering the adaptor
useless.

https://en.wikipedia.org/wiki/File:F...wer-socket.jpg

I had forgotten about that. That's why a lot of 'hybrid' plugs have a
hole in them.

Is it necessary to make contact with both side earths? After all, one
earth pin is all it would get in the UK for which the appliance is
presumably designed.


Probably not but I think that the extra attention to detail
indicates that serious thought has gone into producing a
better quality device. (The construction standards of first
few I saw was very cheap and nasty.)

I would agree with that reasoning.