transformer polarity

beginner question:

Does polarity matter with secondary AC wires from power transformer?

Tricky question. If you're dealing with a transformer that has one primary, one secondary, no, BUT, one lead may be connected to the core/ground. So long as the secondary is not connected to the chassis, or some other extra connection, polarity doesn't matter.

IF, the transformer has two secondaries, like in an audio amp, you have to connect them in series to get 2x the voltage.

It depends on the application.
 
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