"Christian McArdle" wrote in message
. net...
The coroner observed that the cable was only 10mm deep in the wall
insted
of
50mm.

Personally, I don't think 50mm is enough. Drilling for a rawlplug will
frequently go deeper than this. I tend to use brown plugs and 60 or 70mm
screws.

With SDS drills now commonplace, I bet most holes go most of the 100mm or
150mm that the drill bit allows before the inexperienced user has time to
stop. I doubt there are many forms of protection that would stop a 5kG SDS
either.