Thanks for the link!
Ring mains of this type are rare outside the UK. It is used in British influenced countries (including Ireland is influenced by the Brits).
Ring mains for distribution of power (in the street, on poles etc.) has found use in other places too, but I don't know how common it is. It makes a lot of econmical sense, since you can make long cable runs with limited voltage drop in the case of moving loads. Ehhh... Let me rephrase that: If you have a bunch of houses, the odds are that the cooker and the water heater is only on in a couple of houses at the same time. Then a ring is great.
The British plug and socket and ring final circuit system has proven itself over many years. Its
development was due to the recognition of an
opportunity seen by leaders during a time of war and mass destruction. A truly unique, innovative, world class system was developed by people of vision. A system that cannot be equalled in terms of safety, performance and convenience.
