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At that time, many electricity companies operated a split-tariff system where the cost of electricity for lighting was lower than that for other purposes As electricity became a common method of operating labour-saving appliances, a safe means of connection to the electric system other than using a light socket was needed. In one patent, US 774,250 the same type of plug was used with various three-way adaptors that could be connected to lampholders or "a receptacle of any ordinary type".Thomas Tayler Smith of London, England received British patent 4162 in 1882 for an "Electric-Circuit Connection" to "enable the electric conductors conveying the current to one or more lamps, or along a flexible cord, to be rapidly and safely brought into connection with the line or main wires". Figures 2 and 4 of this patent show an adaptor plugged into what appears to be a "Chapman" receptacle.Today there are approximately 20 types in common use around the world, and many obsolete socket types are still found in older buildings.Co-ordination of technical standards has allowed some types of plugs to be used over wide regions to facilitate trade in electrical appliances, and for the convenience of travellers and consumers of imported electrical goods.The types used in each country are set by national standards, some of which are listed in the IEC technical report TR 60083, Plugs and socket-outlets for domestic and similar general use standardized in member countries of IEC.The scope of IEC TR 60083 states: "The report only contains systems for which standard sheets have been published in a National Standard, which may be a National Standard of the country itself or any other IEC member country".The term plug is in general and technical use in all forms of English, common alternatives being power plug, In American English receptacle (which is a term not defined in IEC 60050) is used in official standards and codes such as the NEMA connector standard and the National Electrical Code.

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In this article, the term 'plug' is used in the sense defined by IEC 60050.AC power plugs and sockets are devices that allow electrically operated equipment to be connected to the primary alternating current (AC) power supply in a building.Electrical plugs and sockets differ in voltage and current rating, shape, size and type of connectors.To reduce the risk of users accidentally touching energized conductors and thereby experiencing electric shock, plug and socket systems often incorporate safety features in addition to the recessed slots or holes of the energized socket.These may include plugs with insulated sleeves, recessed sockets, sockets with blocking shutters, and sockets designed to accept only compatible plugs inserted in the correct orientation.Some multi-standard sockets allow use of several different types of plugs; improvised or unapproved adaptors between incompatible sockets and plugs may not provide the full safety and performance of an approved socket and plug combination.Plugs and sockets may sometimes combine male and female contacts, but the exposed pins or terminals in the socket are not energized.Electric Razor Black Men - Register online and you will discover single men and women who are also looking for relationship.An online dating is free to join for dating and flirting with local singles.Smith subsequently received US patent 311,616 there were British patents for plug and sockets granted to T. filed on May 27, 1904 shows lampholder adaptors similar to those of his first patent for use with plugs having coplanar (tandem) flat pins.Hubbell's catalogue of 1906 includes various three-way adaptors similar to those shown in the US 776,326 patent, but modified for use with the coplanar flat pin plugs.

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