How essential is an isolation transformer?

[Mark Hennessy]

"I'd love to know what the "death lead" was!"

Mains plug to croc clips:-)

Oh yes - I didn't think of that. Not warped enough

The oh-so-ironically named "Safebloc" mounted on my variac will allow you to use 4mm plugs - the lid closes just sufficiently if you're careful - but I can't possibly explain how I know that