Likewise, any conductor or cable will pick up energy from any existing electromagnetic field around it.
#Cable basics skin
This is known as the skin effect.Īny current-carrying conductor, including a cable, radiates an electromagnetic field. Continuous-flex or flexible cables used in moving applications within cable carriers can be secured using strain relief devices or cable ties.Īt high frequencies, current tends to run along the surface of the conductor. Ĭables can be securely fastened and organized, such as by using trunking, cable trays, cable ties or cable lacing. Tight lays during stranding makes the cable extensible (CBA – as in telephone handset cords). Tinning was used to help removal of rubber insulation. Tinning is also used to provide lubrication between strands. Tin, gold, and silver are much less prone to oxidation than copper, which may lengthen wire life, and makes soldering easier. 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. Bunching small wires before concentric stranding adds the most flexibility. 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. Electrical cables may be made more flexible by stranding the wires. 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). 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. Electrical cables are extensively used in building wiring for lighting, power and control circuits permanently installed in buildings. Power cables are used for bulk transmission of alternating and direct current power, especially using high-voltage cable. Long-distance communication takes place over undersea cables.
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Cables are used extensively in electronic devices for power and signal circuits. Cables are used for a wide range of purposes, and each must be tailored for that purpose. ( August 2018) ( Learn how and when to remove this template message)Įlectrical cables are used to connect two or more devices, enabling the transfer of electrical signals or power from one device to the other. Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This section needs additional citations for verification.