Tester101Tester101 132k7979 gold badges324324 silver badges611611 bronze badges Increase a remark It's been adopted in many former British colonies and protectorates. BS 1363 was introduced in 1947 as one of several new criteria for electrical wiring in the uk useful for post-war reconstruction. The plug and socket replaced the BS https://arthurzfhjk.blogminds.com/a-simple-key-for-types-of-electrical-cord-plugs-unveiled-27090306