On Mon, 5 May 2008 19:19:16 +0100, Mike Tomlinson
wrote:

but their
effectiveness when used on ungrounded outlets is reduced, since the path
to ground doesn't exist.

I was going to ask whether this would help protect delicate components
in any way, but of course, the neutral is earthed nearby anyways, and
the third earth wire is just a backstop?

jack