Harry Bloomfield wrote:
Phil pretended :
So two layers of double insulation laid in a conduit are going to fail?
At the same instant that someone makes accidental contact?

Quite possibly, that is why the regulations do not permit the mix of
the two. It doesn't actually require metal to metal contact, all it
needs is a nick in the 240v insulation, nick in the Cat5 insulation add
a little rain water in the conduit and you have enough conductivity for
someone to be killed.

That's just not going to happen.

So you would be happy to let your kids handle such a cable -
deliberately installed so as to ignore the regulations intended for
their protection?

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

If any of the mains-propelled electrons go walkabout I expect (and test
that) certain events to occur to turn off the supply, this event being
asynchronous with anyone touching anything.