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Mains power systems : ウィキペディア英語版
Mains electricity by country

Mains electricity by country includes a list of countries and territories, with the plugs, voltages and frequencies they use for providing electrical power to small appliances and some major appliances. Every country has differing rules regarding distribution of electricity for portable appliances and lighting. Voltage, frequency, and plug type vary widely, but large regions may use common standards. Physical compatibility of receptacles may not ensure compatibility of voltage, frequency, or connection to earth ground.
This article lists the plug type, voltage and frequency commonly expected for many territories. In some areas, older standards may still exist. Foreign enclaves or buildings frequented by tourists may support plugs not otherwise used in a country, for the convenience of travellers.
==Main reference source—IEC World Plugs==
The International Electrotechnical Commission publishes a web microsite ''World Plugs''〔(World Plugs ) Retrieved on 2014-01-01.〕 which provides the main source for this page, except where other sources are indicated. ''World Plugs'' includes some history, a description of plug types, and a list of countries giving the type(s) used and the mains voltage and frequency.
Although useful for quick reference, especially for travellers, ''IEC World Plugs'' may not be regarded as totally accurate, as illustrated by the examples in the plugs section below, and errors may exist, such as Indonesia being listed as using both 220 V and 110 V when the Indonesian Standard ''SPLN 1'' clearly states the voltage as 230 V.
==Plugs==
(詳細はIEC technical report TR 60083, ''Plugs and socket-outlets for domestic and similar general use standardized in member countries of IEC''.〔IEC/TR 60083 ed6.0: Plugs and socket-outlets for domestic and similar general use standardized in member countries of IEC. International Electrotechnical Commission, February 2009. This 384-page technical report describes many national standards for domestic plugs and sockets. The first edition was published in January 1957. The 7th edition was approved in December 2012 and awaits publication as at 20th January 2015.〕
The international standard IEC 60884-1 defines the general requirements for plugs and sockets intended for household and similar purposes, IEC 60884-1 does not define specific plug and socket types which are the subject of national standards in each country. IEC 60884-1 para 9.2 does stipulate that: ''it shall not be possible, within a given system, to engage a plug with a socket-outlet having a higher voltage rating or a lower current rating''. IEC 60884-1 para 6.1 defines the preferred voltage ratings for single phase plugs and sockets as 130 V or 250 V. In the foreword of IEC 60884-1 it states: ''in order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.''
The lettering system used here is from ''World Plugs'' which defines the letter names and gives a (not always correct) list of what plug types are used where. Type A makes specific reference to American and Japanese plugs, as does Type B which is specifically rated at 15 A. Type C is specifically identified as the Europlug (which is defined in EN 50075) and described as a plug which fits into any socket that accepts 4.0–4.8 mm round contacts on 19 mm centres. Type D is specifically rated at 5 A. Type E (grounding pin in socket) and Type F (grounding clips on both sides) are specifically rated at 16 A and defined as having 4.8 mm pins on 19 mm centres. Type G is identified as the fused British plug. The Type H plug is described as unique to Israel. Type I (Australian) is described as having both 10 A and 15 A ratings. Type J (Swiss) is rated at 10 A and is differentiated from Type N. The Type K rating is not shown. The Type L (Italian) description includes both ratings and pin sizes. Type M is described as looking similar to Type D, but with much larger pins. The Type N description is of the two variations of Brazilian plug (Brazilian national standard NBR 14136); however, the original plug and socket is defined in IEC 60906-1 and has been adopted as a South African national Standard (SANS 164-2). The Brazilian version is non-compliant with the IEC standard. Not all plugs are included in the letter system; for example, there is no designation for the plug defined by the Thai National Standard ''TIS116-2549''.
''IEC World Plugs'' is ambiguous in some areas: it does not reference national technical standards that define the dimensions and tolerances of devices. Plugs will usually mate with sockets which are intended to accept plugs classified under the same letter type, but there is no guarantee of this. There is also an issue relating to Type C, the EN 50075 Europlug which has no dedicated socket in the standard and is designed to fit sockets accepting "4.0–4.8 mm round contacts on 19 mm centres", implying that there must be usage of such sockets in the territories listed as using Type C plugs. Despite this, ''World Plugs'' lists seven territories as using only Type C (i.e., no mention of specific plug types whose mating sockets also accept Type C) and twenty-one territories using Type C with no compatible types.〔"IEC World Plugs" lists the following territories as using Type C only: Angola, Gabon, Guinea Bissau, Mauritania, Paraguay, Somalia, Togo. It also lists the following territories as using Type C without compatible socket types: Argentina, Bolivia, Cambodia, China, Gibraltar, India, Iraq, Isle of Man, Kuwait, Lebanon, Malaysia, Mauritius, Nepal, Oman, Pakistan, Peru, Singapore, Sudan, United Arab Emirates, Vietnam, Zambia. |(World Plugs )〕 This may be for a number of reasons, for instance the Thai standard TIS 166-2549 includes a socket which will also accept Types A, B and C plugs as well as the Thai plug (which does not have an IEC classification letter). Another possible reason is the use of so-called "universal sockets" in use in some countries, these accept multiple plug types but meet no standards and are not classified by the IEC.
The United States Department of Commerce published an earlier guide,〔 which is now obsolescent and which has known inaccuracies. (See ''History of similar guides'' section below.)

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