Product industry cables, wires and communication cords
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Wire and Cable Testing and Certification Services
An electrical cable is an assembly of one or more wires running side by side or bundled, which is used to carry electric current. A cable assembly is the composition of one or more electrical cables and their corresponding connectors. Cable assemblies can also take the form of a cable tree or cable harness , used to connect many terminals together. The term cable originally referred to a nautical line of specific length where multiple ropes are combined to produce a strong thick line that was used to anchor large ships.
As electric technology developed, people changed from using bare copper wire to using groupings of wires and various sheathing and shackling methods that resembled the mechanical cabling so the term was adopted for electrical wiring.
In the 19th century and early 20th century, electrical cable was often insulated using cloth, rubber or paper. Plastic materials are generally used today, except for high-reliability power cables.
The term has also come to be associated with communications because of its use in electrical communications. Electrical cables are used to connect two or more devices, enabling the transfer of electrical signals or power from one device to the other. Cables are used for a wide range of purposes, and each must be tailored for that purpose.
Cables are used extensively in electronic devices for power and signal circuits. Long-distance communication takes place over undersea cables. Power cables are used for bulk transmission of alternating and direct current power, especially using high-voltage cable.
Electrical cables are extensively used in building wiring for lighting, power and control circuits permanently installed in buildings. Since all the circuit conductors required can be installed in a cable at one time, installation labor is saved compared to certain other wiring methods. Physically, an electrical cable is an assembly consisting of one or more conductors with their own insulations and optional screens, individual covering s , assembly protection and protective covering s.
Electrical cables may be made more flexible by stranding the wires. In this process, smaller individual wires are twisted or braided together to produce larger wires that are more flexible than solid wires of similar size. Bunching small wires before concentric stranding adds the most flexibility. Copper wires in a cable may be bare, or they may be plated with a thin layer of another metal, most often tin but sometimes gold , silver or some other material.
Tin, gold, and silver are much less prone to oxidation than copper, which may lengthen wire life, and makes soldering easier. Tinning is also used to provide lubrication between strands. Tinning was used to help removal of rubber insulation. Cables can be securely fastened and organized, such as by using trunking, cable trays , cable ties or cable lacing.
Continuous-flex or flexible cables used in moving applications within cable carriers can be secured using strain relief devices or cable ties.
At high frequencies, current tends to run along the surface of the conductor. This is known as the skin effect.
Any current -carrying conductor, including a cable, radiates an electromagnetic field. Likewise, any conductor or cable will pick up energy from any existing electromagnetic field around it. These effects are often undesirable, in the first case amounting to unwanted transmission of energy which may adversely affect nearby equipment or other parts of the same piece of equipment; and in the second case, unwanted pickup of noise which may mask the desired signal being carried by the cable, or, if the cable is carrying power supply or control voltages, pollute them to such an extent as to cause equipment malfunction.
The first solution to these problems is to keep cable lengths in buildings short since pick up and transmission are essentially proportional to the length of the cable.
The second solution is to route cables away from trouble. Beyond this, there are particular cable designs that minimize electromagnetic pickup and transmission. Three of the principal design techniques are shielding , coaxial geometry, and twisted-pair geometry. Shielding makes use of the electrical principle of the Faraday cage.
The cable is encased for its entire length in foil or wire mesh. All wires running inside this shielding layer will be to a large extent decoupled from external electrical fields, particularly if the shield is connected to a point of constant voltage, such as earth or ground. Simple shielding of this type is not greatly effective against low-frequency magnetic fields, however - such as magnetic "hum" from a nearby power transformer.
A grounded shield on cables operating at 2. Coaxial design helps to further reduce low-frequency magnetic transmission and pickup. In this design the foil or mesh shield has a circular cross section and the inner conductor is exactly at its center. This causes the voltages induced by a magnetic field between the shield and the core conductor to consist of two nearly equal magnitudes which cancel each other.
A twisted pair has two wires of a cable twisted around each other. This can be demonstrated by putting one end of a pair of wires in a hand drill and turning while maintaining moderate tension on the line.
Where the interfering signal has a wavelength that is long compared to the pitch of the twisted pair, alternate lengths of wires develop opposing voltages, tending to cancel the effect of the interference. In building construction , electrical cable jacket material is a potential source of fuel for fires.
To limit the spread of fire along cable jacketing, one may use cable coating materials or one may use cables with jacketing that is inherently fire retardant. The plastic covering on some metal clad cables may be stripped off at installation to reduce the fuel source for fires. Inorganic coatings and boxes around cables safeguard the adjacent areas from the fire threat associated with unprotected cable jacketing.
However, this fire protection also traps heat generated from conductor losses, so the protection must be thin. To provide fire protection to a cable, the insulation is treated with fire retardant materials, or non-combustible mineral insulation is used see Mineral-insulated copper-clad cable. Hybrid optical and electrical cables can be used in wireless outdoor fiber-to-the-antenna FTTA applications. In these cables, the optical fibers carry information, and the electrical conductors are used to transmit power.
These cables can be placed in several environments to serve antenna mounted on poles, towers or other structures. Local safety regulations may apply. From Wikipedia, the free encyclopedia. For other uses, see Cable disambiguation. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
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An electrical cable is an assembly of one or more wires running side by side or bundled, which is used to carry electric current. A cable assembly is the composition of one or more electrical cables and their corresponding connectors. Cable assemblies can also take the form of a cable tree or cable harness , used to connect many terminals together. The term cable originally referred to a nautical line of specific length where multiple ropes are combined to produce a strong thick line that was used to anchor large ships. As electric technology developed, people changed from using bare copper wire to using groupings of wires and various sheathing and shackling methods that resembled the mechanical cabling so the term was adopted for electrical wiring. In the 19th century and early 20th century, electrical cable was often insulated using cloth, rubber or paper. Plastic materials are generally used today, except for high-reliability power cables. The term has also come to be associated with communications because of its use in electrical communications.
Wire & Cable
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INDUSTRIAL WIRE & CABLE
Blue Jeans Cable, in an arrangement with Belden, now brings a bit of fresh air to the subject: Iconoclast Cables, designed and manufactured by Belden and terminated and tested by Blue Jeans Cable. We stock 2 and 3 conductor AC line cords, hospital grade power cords, multi-outlet extension power cords, notebook power cords, power cord splitters, Y-cables, IEC, and even international cords. Whether travelling with us across the Thames or the globe, we hope you'll see the world with fresh eyes. Line Cords.
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Industrial electric wires & cables
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For over years, Belden has propelled signal transmission technology forward as the world's leading manufacturer of rugged cable solutions. Learn how to choose the right cable for your industrial environment. Installing ruggedized cable is vital to prevent costly downtime and to ensure a safe and secure network. Beyond the demands of other industrial manufacturing sites, the making of anything edible or potable brings additional hygienic requirements.
Electrical Wire and Cable
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Sumitomo Electric proposes optimal cable structures for installation locations, and supports worksites with abundant product inventories and an extensive logistics network. VVF cables are used for wiring of V or less in single-family detached homes and housing complexes, etc. With ease of use and environmental impact in mind, the lineup includes lead-free VVF cables, environmentally friendly EM-EEF cables, and shrink-packaged cables.
ГЛАВА 14 Беккер впился глазами в труп. Даже через несколько часов после смерти лицо азиата отливало чуть розоватым загаром. Тело же его было бледно-желтого цвета - кроме крохотного красноватого кровоподтека прямо над сердцем.
Скорее всего от искусственного дыхания и массажа сердца, - подумал Беккер.
Видите ли, я, честно говоря, очень спешу. - Он надеялся, что отказ представителю самого мощного разведывательного ведомства не слишком большая глупость с его стороны, но партия в сквош начиналась через сорок пять минут, а он дорожил своей репутацией: Дэвид Беккер никогда не опаздывает на партию в сквош… на лекцию - да, возможно, но на сквош -. - Постараюсь быть краткой, - улыбнулась Сьюзан Флетчер. - Пожалуйста.
Через десять минут Беккер уже сидел в буфете АНБ, жуя сдобную булку и запивая ее клюквенным соком, в обществе очаровательной руководительницы Отделения криптографии АНБ. Ему сразу же стало ясно, что высокое положение в тридцать восемь лет в АНБ нельзя получить за красивые глаза: Сьюзан Флетчер оказалась одной из умнейших женщин, каких ему только доводилось встречать.
Обсуждая шифры и ключи к ним, он поймал себя на мысли, что изо всех сил пытается соответствовать ее уровню, - для него это ощущение было новым и оттого волнующим.
Ни одной машины. Он подбежал к крепко сбитому охраннику. - Мне срочно нужно такси.