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History of the Television

작성자 작성자 Candida · 작성일 작성일24-08-29 20:54 · 조회수 조회수 16

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The first British standard for domestic three-pin plugs was BS 317 Hand-Shield and Side Entry Pattern Three-Pin Wall Plugs and Sockets (Two Pin and Earth Type) published in 1928. This was superseded in 1930 by BS 372 Side-Entry Wall Plugs and Sockets for Domestic Purposes Part II which states that there are only minor alterations from BS 317. In 1934, BS 372 Part II was in turn superseded by the first edition of BS 546 Two-Pole and Earthing-Pin Plugs and Socket Outlets. The first "true" remote control was produced by Zenith and released in 1955. This remote control could turn the television on or off and change the channel. More than 1,200 electric vehicle charging devices were installed for public use in the UK between July and September, new figures released this week show. More appropriate lower-capacity fuses are now supplied with some plugs instead. Plugs fitted with BS 546 fuses have been optional since the original BS 546:1934 with maximum fuse ratings of 2 A in the 2 A plug, and 5 A in the 5 A, 15 A and 30 A plugs.



There are four ratings of plug and socket in BS 546, (2 A, 5 A, what is electric cable 15 A and 30 A). BS 546:1934 clause 2 specifies interchangeability with BS 372 Part II which includes the same four plug and socket sizes. When installed in wet areas (e.g. bathrooms), for safety reasons it is normally found incorporated into a shaver supply unit which includes an isolation transformer and meets various mechanical and electrical characteristics specified by the BS EN 61558-2-5 safety standard to protect against shock in wet areas. The isolation transformer often includes a 115 V output that supplies a two-pin US Type A socket. Historically, two-pin sockets without earth were used in Britain, but their use is now restricted to sockets specifically designated for shavers and toothbrushes. Also in 1934 the 10th Edition of the IEE's "Regulations for the Electrical Equipment of Buildings" introduced the requirement for all sockets to have an earth contact. There is an erroneous tendency to refer to power conversion devices with incorporated plug pins as plugs, but IEC 60050 refers to these as 'direct plug-in equipment' defined as "equipment in which the mains plug forms an integral part of the equipment enclosure so that the equipment is supported by the mains socket-outlet".

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Modern British sockets for domestic use are normally manufactured as single or double units with an integral face plate and are designed to fit standard mounting boxes. An adaptor (in the context of plugs and sockets) is defined in IEC 60050 as "a portable accessory constructed as an integral unit incorporating both a plug portion and one or more socket-outlet portions". I believe this economy would be at the expense of security, and that the cable of the future will be even heavier, more perfect, and more costly, than the cable of the present day.-Abstract of Address before the Statistical Society. Yamaha 285pe inboard motor catalog electric cables : The smart motor generator with electronic controller will ensure gentle and smooth starting of engine with minimal throttle. I desire to write with great respect for the opinions of the talented men who urge the adoption of light cables; it is my special duty to weigh well and without prejudice all they have to advance; but I think a careful investigation into the experience and practice of the last twenty years establishes conclusively that all light cables have been short-lived, and that all heavy cables have continued working, often under most adverse conditions.



Adaptors were available from 15 A down to 5 A and from 5 A down to 2 A so in practice it was possible for an appliance with the smallest size of flex to be protected only by a 15 A fuse. This plug was used to connect low-power appliances (and to adaptors from the larger socket types). In the UK it was used for moderate sized appliances, either on its own 5 A circuit or on a multi socket 15 A circuit, and also on many adaptors (both multi socket 5 A adaptors and adaptors that also had 15 A pins). The BS 4573 socket is for use in rooms other than bathrooms. BS 4573 British Standard Specification for two-pin reversible plugs and shaver socket-outlets defines a plug for use with electric shavers. BS 73 Wall plugs and sockets (five ampere two-pin without earthing connection) was first published in 1915, and revised in 1919 with the addition of 15 A and 30 A sizes. Stress cones are also a useful addition to any medium-to-high voltage wiring where the shield cabling is being terminated. The assumption is made in the census report that this variation is explained by the fact that electric roads, being new, occupy lines over which the passenger traffic has been but partly developed.

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