Peter P. wrote:

> Afaik for small transformers with 2 primaries in series for 220V, and one
> winding body (EI shape, not O shape) only one should be used for 110V
> operation (the one that shows higher R on the ohmmeter - this will be
> the one that is 'outside' in the winding pack and gets better cooling in
> air - this is counterintuitive).

Isn't sometimes the winding that is to be used for 115V done with a thicker
wire (as it has to be able to handle twice the current that the other
primary winding gets)? Then it would be the one that shows lower R, right?

Gerhard

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