插頭的結構是什麼?

第I 類家用電氣產品如裝有 IEC 884-1 插頭，該插頭應為三腳結構，令電氣產品的可觸及導電部分的接地保護，保持與電源接地系統連接。這類產品的插頭結合特別適配接頭所提供的安全程度，須相等於符合 BS 546、BS 1363 第1 部或 BS 5733 的插頭。


根據國際標準 IEC 60446，插頭內部結構包括﹕
──　Earth Terminal地線　　　Green/yellow striped
──　Neutral Terminal水線 　　Blue
──　Live Terminal火線
　　　　Single phase: Live (L) 　Brown,
　　　　Three phase: L1　　　Brown,
　　　　Three phase: L2　　　Black,
　　　　Three phase: L3　　　Grey
──　Cable Grip
──　Fuse


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BS 1363
British Standard BS 1363 specifies the type of domestic AC power plugs and sockets most commonly used in the United Kingdom, Ireland, and many former British colonies. In these countries, the system is colloquially also known as the 13 amp plug/socket. Some praise BS 1363 to be one of the safest domestic power-connector systems in the world, although it is difficult to make objective comparisons. Other plug types, such as IEC 309 and BS 546, are only seen in old installations and specialised applications, where either the BS 1363 plug is unsuitable or where mateability with the standard variety is not desired.

A BS 1363 plug has two horizontal, rectangular pins for phase (commonly termed 'live' by non-specialists) and neutral, and above these pins, a larger, vertical pin for an earth connection. Unlike with most other types of sockets, the earth pin is mandatory in the BS 1363 plug, as it is needed to open a shutter in the socket. It also polarises the plug. Moulded plugs for unearthed, double-insulated appliances may substitute this contact with a plastic pin. Virtually all non-fixed domestic equipment is connected using the BS1363 plugs, the main exceptions being equipment requiring more than 13 amperes (e.g. larger electric cookers, which are hard-wired), and remotely switched, non-fixed lighting (which use proprietary or BS546 plugs).

Because typical British circuits (especially ring circuits) can deliver much more power than an appliance flex (power cord) can safely handle, these plugs are required to carry a cartridge fuse. The fuse is manufactured to BS 1362 and are normally rated at 3, 5, 10 or 13 amperes. The maximum load that can be placed on a socket is 13 A; triple and larger sockets are fitted with a 13 A fuse of the same type used in the plugs. The plugs and sockets are designed to carry up to 250 volts AC, 50 hertz. For information on the safe installation of BS 1363 sockets, see the article on Electrical wiring (UK).


Countries of use
This design is not only in use in the United Kingdom and Ireland, but also in Sri Lanka, Cyprus, Malta, Gibraltar, Botswana, Ghana, Hong Kong, Macau, Brunei, Malaysia, Oman, Singapore, Kenya, Nigeria, Iraq, Qatar, and Zimbabwe. BS 1363 is also standard in several of the former British Caribbean colonies such as Dominica, St. Lucia, St. Vincent and Grenada.



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插頭結構圖片﹕
http://upload.wikimedia.org/wikipedia/en/7/72/Three_pin_mains_plug_%28UK%29.png


插頭∕插蘇圖片﹕
http://upload.wikimedia.org/wikipedia/commons/8/86/G_plug.png
http://upload.wikimedia.org/wikipedia/commons/9/95/BritishPlugforWikipedia.jpg
http://upload.wikimedia.org/wikipedia/commons/5/5a/Type_M_travel_adaptor.jpg


參考資料﹕
http://en.wikipedia.org/wiki/BS_1363+http://en.wikipedia.org/wiki/Electrical_wiring_%28UK%29

240V, 50Hz 三孔長方型 三腳插頭及插左是一個雙重保障的設計
國 （地區）名 週率（Hz） 電壓（voltage） 插頭（plug）
England 英國 50 240 BP3, BP