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Can two inputs make an isolation transformer?
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electrodacus:
I think you where searching for this

Gyro:
Perfect.  :-+

Those embedded thermal switches (they may well be non-resetting) are another reason not to take liberties with it!
ArthurDent:
As others have said, it may already have a split 120/240 volt secondary.  The unused wires are probably unused 100 volt primary taps. Looks like it has a shield between primary and secondary and low capacitive coupling. Use an incandescent 40 watt bulb in series with the line when you first power it up to make sure of your connections. It should be good for up to 2.5 A.

https://www.plitron.com/default-factory-specs/medical-grade-toroidal-transformers/
scuzzyTerminator:

--- Quote ---I think you where searching for this
--- End quote ---

Thanks. I went back to the store today and found what I think is the correct schematic. Exactly the same but with a ground shield.

Those certainly look like they are supposed to depict 1:1 windings.
scuzzyTerminator:

--- Quote ---It doesn't sound as if you are that experienced in mains wiring from your previous replies, if so, please be very careful and ask for advice. Be safe.
--- End quote ---

I'm actually less experienced than it sounds. I'll be careful. The best thing I got going for me is that mains freaks me out.

Thanks for all your help.
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