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said:

I'm not familiar with Euro electrical standards.
In the states it's not unusual to have a small (mv) current on the
neutral
relative to the ground or earthed connection from a lighting dimmer
or touch lamp or motor.
If it exceeds a volt or two then it becomes an audible problem.
The transformers I have encountered have always had the winding
connected between hot and neutral. Core grounded to chassis.
If the chassis is grounded to the earth at the AC power source
by the power cord or a separate third wire to the power strip,
how does reversing hot and neutral improve the situation?
This is not to be confused with reversing the polarity of speaker
connections, which is a phase issue (_ _ _'s speakers suck) :-)

Most commercial gear I see, have mains cables without PE.
Here in Holland, they can go bot ways into the socket.

ScottW and François both explained it better than I did.

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- Never argue with idiots, they drag you down their level and beat you with experience. -