Cheap isolation transformer

[greg...@hotmail.com]

Has anyone encountered problems using a transformer with dual primary windings as an isolation transformer ? I'm only powering 1 primary, and using the other primary "as a secondary winding" to provide isolated 120VAC. I've chosen a larger unit so that I wont exceed (or even get close to) the VA rating.

I know I wont get the same degree of isolation as the real thing, but that's not important for me.

My actual project requires 3 isolated windings in 1 unit, so a commonly available dual-primary/dual-secondary transformer looks like a perfect fit.