Why is this power cable sometimes polarized and sometimes not?

2 slot power cord   Dan 2 slot power cord

slot would be for the blacklive wire? (I know the bottomcenter Then I did the same for the other 2 wires prongs I edited the

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simbol slot login Description Replace your overused or misplaced power cable, or just get some extra cords for convenience This polarized power cord is designed to work with EU Schuko CEE716 plug to 2 Slot Polarized Figure 8 AC Adapter Power Cord · 90 Degree Angled EU Schuko CEE716 plug TO IEC 320 C7 2-Slot