I've come across a variable transformer/variac which is designed to be used with 110V input. Our line supply here is 230V.
If I was careful not to exceed the VA rating of the transformer (920VA) would it be possible to safely use this with a 230V input? (I'd expect the output voltage to be twice of course, and I suppose replace the fuses with 1/2 current equivalents)
It's something like this: