ARWadsworth wrote:

Explain what "proving dead" is please. The mouse certainly was in my opinion
but I am not a vet.

That process of checking that conductors or equipment that you are about
to work on and that you /think/ you've isolated *really* is dead. A
proper formal procedure (e.g. to comply with the EAW regs) involves
using a test lamp or voltage indicator and proving that the indicating
device itself is working both before and after the test.

Plenty of hits on Google, e.g.
http://www.niceic.org.uk/approved/elecatwork.html

--
Andy