Andy Dingley wrote:

Thanks for the informative post.

As a rather gruesome example, there was a recent UK case (discussed at
length in uk.d-i-y) where the daughter of a TV presenter (?) was
electrocuted in their kitchen. A metal pan rack had been installed
over the cooker and the mounting screw had nicked a cable in the wall
(the cable had been improperly routed and not correctly protected).
For some time the family had experienced a tingle from this rack, but
done nothing about it. Finally the victim was killed by it, because
one day her ankle also happened to be touching the well-earthed and
low-impedance case of the dishwasher (there was a contact burn on her
ankle aferwards).

So my fears aren't, um, groundless. ;-)

-- Mark