In the figures to follow, the phasor diagrams found more commonly in US practice are shown on
the left, and phasor diagrams that might be more like those found in international practice are
shown on the right. Polarity marks have been added to the US practice phasor drawings. The
winding diagram in the lower left is intended to show most clearly how the windings would be
interconnected, using US practice bushing names. The figure on the lower right shows a
common international method of showing the winding connections, except the method has been
modified by the addition of polarity marks and winding numbers, and in these figures, when
zigzag windings are shown, one winding set is shown with the polarity mark up, and the other
with the polarity mark down, so that it is easier to see the interconnection of the windings,
compared to IEC drawing practices.