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For other uses, see .
Wires overhead
A wire is a single, usually , flexible strand or rod of metal. Wires are used to bear mechanical
and . Wire is commonly formed by
the metal through a hole in a
come in various
sizes, as expressed in terms of a . The term wire is also used more loosely to refer to a bundle of such strands, as in 'multistranded wire', which is more correctly termed a
in mechanics, or a
in electricity.
Wire comes in solid core, stranded, or braided forms. Although usually circular in cross-section, wire can be made in square, hexagonal, flattened rectangular, or other cross-sections, either for decorative purposes, or for technical purposes such as high-efficiency
in . Edge-wound , such as the
toy, are made of special flattened wire.
often contains, in the form of chains and applied decoration, large amounts of wire that is accurately made and which must have been produced by some efficient, if not technically advanced, means. In some cases, strips cut from metal sheet were made into wire by pulling them through perforations in stone beads. This causes the strips to fold round on themselves to form thin tubes. This strip drawing technique was in use in
by the . From the middle of the
most of the
wires in jewellery are characterised by seam lines that follow a spiral path along the wire. Such twisted strips can be converted into solid round wires by rolling them between flat surfaces or the strip wire drawing method. The strip twist wire manufacturing method was superseded by
in the ancient
sometime between about the 8th and 10th centuries AD. There is some evidence for the use of drawing further East prior to this period.
Square and hexagonal wires were possibly made using a
technique. In this method a metal rod was struck between grooved metal blocks, or between a grooved punch and a grooved metal . Swaging is of great antiquity, possibly dating to the beginning of the 2nd millennium BC in Egypt and in the
in Europe for
Twisted square section wires are a very common
decoration in early
jewellery.
In about the middle of the 2nd millennium BC a new category of decorative tube was introduced which imitated a line of granules. True beaded wire, produced by mechanically distorting a round-section wire, appeared in the
and Italy in the seventh century BC, perhaps disseminated by the . Beaded wire continued to be used in jewellery into modern times, although it largely fell out of favour in about the tenth century AD when two drawn round wires, twisted together to form what are termed 'ropes', provided a simpler-to-make alternative. A forerunner to beaded wire may be the notched strips and wires which first occur from around 2000 BC in .
in England from the medieval period. The wire was used to make
and pins, manufactured goods whose import was prohibited by
in 1463. The first wire mill in Great Britain was established at
in about 1568 by the founders of the , who had a
on this. Apart from their second wire mill at nearby Whitebrook, there were no other wire mills before the second half of the 17th century. Despite the existence of mills, the drawing of wire down to fine sizes continued to be done manually.
Wire is usually drawn but it may be made of any desired section by varying the outline of the holes in the draw-plate through which it is passed in the process of manufacture. The
is a piece of hard cast-iron or hard steel, or for fine work it may be a
or a . The object of utilising precious stones is to enable the dies to be used for a considerable period without losing their size, and so producing wire of incorrect diameter. Diamond dies must be rebored when they have lost their original diameter of hole, but metal dies are brought down to size again by hammering up the hole and then drifting it out to correct diameter with a punch.
Wire has many uses. It forms the raw material of many important , such as the
industry, engineered springs,
making and
spinning, in which it occupies a place analogous to a
. Wire-cloth of all degrees of strength and fineness of mesh is used for sifting and screening machinery, for draining paper pulp, for window screens, and for many other purposes. Vast quantities of , ,
wire are employed for telephone and , and as conductors in , and . It is in no less demand for fencing, and much is consumed in the construction of , and cages, etc. In the manufacture of stringed musical instruments and scientific instruments wire is again largely used. Carbon and stainless spring steel wire have significant applications for engineered springs for critical automotive or industrial manufactured parts/components. Among its other sources of consumption it is sufficient to mention pin and
making, the needle and
industries, nail, peg and rivet making, a indeed there are few industries into which it does not enter.
Not all metals and metallic
possess the physical properties necessary to make useful wire. The metals must in the first place be
and strong in tension, the quality on which the utility of wire principally depends. The metals suitable for wire, possessing almost equal ductility, are , , , , and it is only from these and certain of their
with other metals, principally
and , that wire is prepared (For a detailed discussion on , see main article: .).
By careful treatment extremely thin wire can be produced. Special purpose wire is however made from other metals (e.g.
filaments, because of its high melting temperature). Copper wires are also plated with other metals, such as tin, nickel, and silver to handle different temperatures, provide lubrication, provide easier stripping of rubber from copper.
Wire mill (1913)
Main article:
Wire is often reduced to the desired diameter and properties by repeated
through progressively smaller dies, or traditionally holes in . After a number of passes the wire may be
to facilitate more drawing or, if it is a finished product, to maximise ductility and conductivity.
Electrical wires are usually covered with , such as plastic, rubber-like polymers, or varnish. Insulating and jacketing of wires and cables is nowadays done by passing them through an extruder. Formerly, materials used for insulation included treated cloth or paper and various oil-based products. Since the mid-1960s, plastic and
exhibiting properties similar to rubber have predominated.
Two or more wires may be wrapped concentrically, separated by insulation, to form . The wire or cable may be further protected with substances like , some kind of preservative compound, bitumen, , aluminum sheathing, or steel taping. Stranding or covering machines wind material onto wire which passes through quickly. Some of the smallest machines for cotton covering have a large drum, which grips the wire and moves it t the wire passes through the centre of disks mounted above a long bed, and the disks carry each a number of
varying from six to twelve or more in different machines. A supply of covering material is wound on each bobbin, and the end is led on to the wire, which occupies a central position relat the latter being revolved at a suitable speed bodily with their disks, the cotton is consequently served on to the wire, winding in spiral fashion so as to overlap. If a large number of strands are required the disks are duplicated, so that as many as sixty spools may be carried, the second set of strands being laid over the first.
, one example of a jacketed and insulated wire.
For heavier cables that are used for
and power as well as submarine cables, the machines are somewhat different in construction. The wire is still carried through a hollow shaft, but the bobbins or spools of covering material are set with their spindles at right angles to the axis of the wire, and they lie in a circular cage which rotates on rollers below. The various strands coming from the spools at various parts of the circumference of the cage all lead to a disk at the end of the hollow shaft. This disk has perforations through which each of the strands pass, thence being immediately wrapped on the cable, which slides through a bearing at this point. Toothed gears having certain definite ratios are used to cause the winding drum for the cable and the cage for the spools to rotate at suitable relative speeds which do not vary. The cages are multiplied for stranding with a large number of tapes or strands, so that a machine may have six bobbins on one cage and twelve on the other.
Further information:
Solid wire, also called solid-core or single-strand wire, consists of one piece of metal wire. Solid wire is useful for wiring breadboards. Solid wire is cheaper to manufacture than stranded wire and is used where there is little need for flexibility in the wire. Solid wire also provides m and, because it has relatively less surface area which is exposed to attack by corrosives, protection against the environment.
Stranded wire is composed of a number of small gauge wire bundled or wrapped together to form a larger conductor. Stranded wire is more flexible than solid wire of the same total cross-sectional area. Stranded wire tends to be a better conductor than solid wire because the individual wires collectively comprise a greater surface area. Stranded wire is used when higher resistance to
is required. Such situations include connections between
in multi-printed-circuit-board devices, where the rigidity of solid wire would produce too much stress as a result of movement during a
music c weld control cables connecting
m tra and numerous others.
At high frequencies, current travels near the surface of the wire because of the , resulting in increased power loss in the wire. Stranded wire might seem to reduce this effect, since the total surface area of the strands is greater than the surface area of the equivalent solid wire, but ordinary stranded wire does not reduce the skin effect because all the strands are short-circuited together and behave as a single conductor. A stranded wire will have higher resistance than a solid wire of the same diameter because the cross-section of the stranded wi there are unavoidable gaps between the strands (this is the
problem for ). A stranded wire with the same cross-section of conductor as a solid wire is said to have the same
and is always a larger diameter.
However, for many high-frequency applications,
is more severe than skin effect, and in some limited cases, simple stranded wire can reduce proximity effect. For better performance at high frequencies, , which has the individual strands insulated and twisted in special patterns, may be used.
A braided wire is composed of a number of small strands of wire braided together. Similar to stranded wires, braided wires are better conductors than solid wires. Braided wires do not break easily when flexed. Braided wires are often suitable as an electromagnetic shield in noise-reduction cables.
The more individual wire strands in a wire bundle, the more flexible, kink-resistant, break-resistant, and stronger the wire is. But more strands increase cost.
The lowest number of strands usually seen is 7: one in the middle, 6 surrounding it. The next level up is 19, which is another layer of 12 strands on top of the 7. After that the number varies, but 37 and 49 are common, then in the 70 to 100 range (the number is no longer exact). Even larger numbers than that are typically found only in very large cables.
For application where the wire moves, 19 is the lowest that should be used (7 should only be used in applications where the wire is placed and then does not move), and 49 is much better. For applications with constant repeated movement, such as assembly robots and
wires, 70 to 100 is mandatory.
For applications that need even more flexibility (welding is the usual example, but also any need to move wire in tight areas), even more strands are used. One example is a 2/0 wire made from 5,292 strands of #36 gauge wire. The strands are organized by first creating a bundle of 7 strands. Then 7 of these bundles are put together into super bundles. Finally 108 super bundles are used to make the final cable. Each group of wires is wound in a helix so that when the wire is flexed, the part of a bundle that is stretched moves around the helix to a part that is compressed to allow the wire to have less stress.
bound with gold wire.
Hook-up wire is small-to-medium gauge, solid or stranded, insulated wire, used for making internal connections inside electrical or electronic devices. It is often tin-plated to facilitate soldering.
is the application of microscopic wires for making electrical connections inside
components and integrated circuits.
Magnet wire is solid wire, usually , which, to allow closer winding when making electromagnetic coils, is insulated only with varnish, rather than the thicker plastic or other insulation commonly used on electrical wire. It is used for the winding of , , , ,
coils, etc. (For further information about , see: .).
Coaxial cable is a cable consisting of an inner conductor, surrounded by a tubular insulating layer typically made from a flexible material with a high dielectric constant, all of which is then surrounded by another conductive layer (typically of fine woven wire for flexibility, or of a thin metallic foil), and then finally covered again with a thin insulating layer on the outside. The term coaxial comes from the inner conductor and the outer shield sharing the same geometric axis. Coaxial cables are often used as a transmission line for radio frequency signals. In a hypothetical ideal coaxial cable the electromagnetic field carrying the signal exists only in the space between the inner and outer conductors. Practical cables achieve this objective to a high degree. A Coaxial Cable provides protection of signals from external electromagnetic interference, and effectively guides signals with low emission along the length of the cable.
Speaker wire is used to make the electrical connection between loudspeakers and audio amplifiers. Modern speaker wire consists of electrical conductors individually insulated by plastic.
is wire with higher than normal resistivity, often used for
or for making wire-wound .
wire is the most common type.
For transmission see: ,
Swiger Coil Systems. . Swiger Coil Systems, A Wabtec Company 2011.
Jack Ogden, ‘Classical Gold wire: Some Aspects of its Manufacture and Use’, Jewellery Studies, 5, 1991, pp. 95–105.
Jack Ogden, ‘Connections between Islam, Europe, and the Far East in the Medieval Period: The Evidence of the Jewelry Technology’. Eds P. Jett, J Douglas, B. McCarthy, J Winter. Scientific Research in the Field of Asian Art. Fiftieth-Anniversary Symposium Proceedings. Archetype Publications, London in association with the Freer Gallery of Art, Smithsonian Institution, 2003.
H. R. Schubert, 'The wiredrawers of Bristol' Journal Iron & Steel Institute 159 (1948), 16-22.
M. B. Donald, Elizabethan Monopolies: Company of Mineral and Battery Works (Olver & Boyd, Edinburgh 1961), 95-141.
D. G. Tucker, 'The seventeenth century wireworks at Whitebrook, Monmouthshire' Bull. Hist. Metall. Gp 7(1) (1973), 28-35.
&#160;This article&#160;incorporates text from a publication now in the :&#160;Chisholm, Hugh, ed. (1911). "".
28 (11th ed.). Cambridge University Press. p.&#160;738.
in Wiktionary, the free dictionary.
- Online calculator converts gauge to diameter or diameter to gauge for any wire size.
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