As said above 240V can and does kill, fact.
I have been told from a reliable source that 60V DC has the capacity to kill as well. Sparky pal of mine told me once that a 13A fuse by the time it blows could be passing 2 or 3 or 4 times that current, and you are fried by the time it does.
I also heard on a static electricity course that 1 joule of electricty in the wrong place on your heart can stop it, that is 1W for 1sec, which is a very small amount of electricity. Static from clothes for example is 1000's of V but very low current so its harmless. Static discharge from a large helicopter grounding however can kill you.
So dont be silly and get a sparky in :-)