by the way, do you have some online reference for that transformer?

Here it comes:

http://www.block-trafo.de/v1/upload/vb.pdf

Costs less than 4 Euro in Germany.

It can also help to put an eye on:

http://www.ebme.co.uk/arts/safety1.htm
http://www.ebme.co.uk/arts/safety2.htm
http://www.ebme.co.uk/arts/safety3.htm
http://www.ebme.co.uk/arts/safety4.htm
http://www.ebme.co.uk/arts/safety5.htm
http://www.ebme.co.uk/arts/safety6.htm#gen

And if this is not enough, type something like

"electrical safety tutorial"

into the google machine.


Good luck,
Kai