[sbierwagen]

https://en.wikipedia.org/wiki/Europlug

[nextstep]

Why doesn't the Europlug have a ground?

[matthiasl]

In addition to what 'stevek' wrote; the Europlug was designed so that it would fit many existing, incompatible European plugs.

One of the things that makes the European plugs incompatible is that they ahve different types of earthing. One example is Sweden versus Switzerland. In Sweden, the common socket has earth on the sides of the plug (see http://en.wikipedia.org/wiki/Schuko) whereas in Switzerland the earth is a pin (http://en.wikipedia.org/wiki/AC_power_plugs_and_sockets#Swis...).

By not having an earth, the Europlug fits both the Swiss and Swedish sockets.

[stevek]

From the link: Europlugs are only designed for low-power (less than 2.5 A) Class II (double-insulated) devices that operate at normal room temperature and do not require a protective-earth connection.