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Is there a unified world-wide standard for plug and socket size?

So far, there is no unified world-wide standard for plug and socket size. Every country has its own size standards system.
 
What differences exist among the household plugs of all countries of the world?

There are mainly three systems, ‎differentiated by types sizes:

-Round type System
-Flat type System
-Rectangle type system
The round type system is used for most continental European countries: such as Germany, France, Austria, Belgium, Russia and so on.
Rectangle type system is used for most of the original Commonwealth countries: the United Kingdom, India, Pakistan, Malaysia, Singapore and Hong Kong.
Flat type system is used mostly for the United States, Japan, Australia, New Zealand, China and so on.


 

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