I did not think about that difference, we still say 380 for 400, 220 for 230 etc here. In this discussion are this just of academic interest. If you tell people it is the phase voltage divided with the square root of 3, most people just say yes OK. (but get no interest)

If you draw a triangle of with sides of 230, put in a Y and measure to the center they may even understand it.

(I have teaught this on a modest level)

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