The lack of polarization makes it safer to use Schuko with a NEMA 6-15 plug, which has hot-hot-ground instead of hot-neutral-ground. If the receptacle had a we

The lack of polarization makes it safer to use Schuko with a NEMA 6-15 plug, which has hot-hot-ground instead of hot-neutral-ground. If the receptacle had a well defined neutral, then devices might expect it to be neutral.