On Mon, 29 Jul 2013 11:05:52 +0100, Davey wrote:

No! At least, not when I left in late 2010, and there was no talk of
any sleeving then. And plugs don't have fuses, either.

US plugs don't need to fused as the US wiring system is radial not
ring.

What was the point of the shutter if it didn't kill power to the pins?

To prevent easy access to the possibly live parts in the socket when
there is no plug inserted.

--
Cheers
Dave.