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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 contacts of the energized socket. Since 1934, the contacts of a socket have been specified in terms of the pins of the plug, rather than by specifying the contact dimensions. The plug and socket replaced the BS 546 plug and socket, which are still found in old installations or in special applications. 1999. BS 546 is also the precursor of current Indian and South African plug standards. The same catalogue included lampholder plugs for both BC and ES lampholders (capacity unspecified), and also a type of two-pole concentric plug and socket (similar to a very large version of the concentric connectors used for laptop PC power connections) in the "1 to 5 lights" and "5 to 10 lights" capacities. 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. Moreover, experience had shown that the protecting sheath or armour of the core should be light and flexible as well as strong, in order to resist external violence and allow it to be lifted for repair.

This means that if a shirt has a block of RGB LED lights (LEDs that can emit any color of light), the wearer can create a program telling each LED when to turn on and off as well as what color it should be. Hopefully, if and when we reach that point, we'll also have a way to arrange nanowires the way we want so that we can use them to their full potential. Line (commonly, but technically incorrectly, called live) carries the full supply voltage relative to the neutral. Electrical sockets for single phase domestic, commercial and light industrial purposes generally provide three electrical connections to the supply conductors. There were concerns that consumer safety was compromised by the substantial quantity of counterfeit and unsafe electrical plugs and sockets being placed on the UK market and also by the provision of electrical equipment without an appropriate means to connect it to the mains supply in the consumer's home. The earthed consumer plug has several claimants to its invention.

Maud Lucas Lancaster mentions an earthed iron-clad plug and socket by the English firm of A. Reyrolle & Company. BS 546 plugs and sockets are still permitted in the UK, provided the socket has shutters. The pin configuration of the Tripin appears virtually identical to modern BS 546 plugs. It is often associated with obsolete wiring installations or where it is found in modern wiring, it is confined to special use cases, particularly for switch-controlled lamps and stage lighting. When electricity was first introduced into houses, it was primarily used for lighting. However, if you're shopping for reproductions, do your homework first. 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". These were usually sold as a mating pair, what is electric cable but gradually de facto and then official standards arose to enable the interchange of compatible devices. Modem stands for MODulation-DEModulation, a process in which digital information is converted to analog for transmission, then back again.

This may be the information age, but how much do you get? They also require that all mains appliances for domestic use in the UK be supplied with approved BS 1363 plugs, but there is an exception for plugs fitted to shavers and toothbrushes which are normally a UK shaver plug (BS 4573) but may also be a Europlug (BS EN 50075). The regulations also contain a provision for the approval of non-BS 1363 conforming plugs when "the plugs are constructed using an alternative method of construction which provides an equivalent level of safety in respect of any risk of death or personal injury to plugs which conform to BS 1363 and is such that plugs of that type may reasonably be expected to be safe in use". Plugs and sockets for electrical appliances not hardwired to mains electricity originated in the United Kingdom in the 1870s and were initially two-pin designs. In 1885, two-pin plug designs appeared and in 1889 there were two-pin plugs and sockets in the GEC catalogue.