In message , Geoffrey S.
Mendelson writes:
[]
Shucko plugs have grounding problems. They rely on the plug being all the
way in (ground is connected AFTER the mains) and an easily bent spring in
the outlet.

Hmm, I don't remember seeing the spring ever bent (it's quite a
substantial piece of metal), though I can see it _could_ happen,
especially with abuse.

As for which connects first, I can't say for sure, but I used to find
the sockets - in which the whole socket is recessed - far more
reassuring than the British flush ones, in which one could touch the
pins; OK, the British one was redesigned such that the pins have to be
shrouded, but that happened much later, and I can certainly remember
when unshrouded was the norm (sometime in the 1970s?). [The shrouding
must reduce the cross-sectional area, too, though (a) see earlier
comments about the ratings being far more than required for most
appliances anyway, (b) I was once told that it is the contact area
rather than the cross-sectional which is likely to be a problem.
(Thinking about the wire attached, that's probably true.)]

Much better is a 230 volt version of the US 3 prong plug, two round pins
like the standard EU ungrounded plug, with a slightly longer ground pin
in the center and below them like this:

O O
O

The advantage is that unless you work at it, the ground pin makes contact
first.
[]
I was quite impressed the first time I saw what I think of as the
"Dutch" design: a bit like the Schuko, but the earth is actually a
socket in the plug, and a pin in the socket! Thus if you try to plug in
a plug that doesn't have the socket, it won't go in!
--
J. P. Gilliver. UMRA: 1960/1985 MB++G.5AL-IS-P--Ch++(p)Ar@T0H+Sh0!:`)DNAf

"Going to church doesn't make you a Christian anymore than going to a garage
makes you a car." - Laurence J. Peter