the ground pin is not about power, is about the isolation type of the appliance. Appliances class II don't require ground, for example https://en.wikipedia.org/

the ground pin is not about power, is about the isolation type of the appliance. Appliances class II don't require ground, for example https://en.wikipedia.org/wiki/Appliance_classes https://en.wikipedia.org/wiki/Appliance_classes