Hi from up here in the U.S. I'm hoping someone can give me a little help with wiring of a Toroid transformer. I have several display elements that are using 24 volt sections of 10 or 11 incan-minis. Instead of using 6 or 8 small 24 volt transformers I thought it would be better to use a toroid since Iv'e already had it for quite a while but haven't used it yet. So here is my question. I am confused about the primary wiring. It has 2 separate 117 volt primary coils. If I connect either one of the primaries, I get about 25.5 volts on both of the secondaries. If I connect both primaries to my 120 volt supply it blows the fuse on the mains supply. Why do I have dual primaries ??? Can I connect them in series and supply the primaries with a 220-240 volt supply ??? Or am I over thinking everything and I just need to connect one of the primary coils ??? I know toroids are widely used in Australia so I thought maybe somebody down there could give me an explanation or some advice. I will try and attach a photo of the toroid I'm trying to use, Thanks for any help you can give me before I burn my house down.