Shielded cable, otherwise known as screened cable, is an electrical power cable that consists of at least one insulated conductor, which is held within a form of conductive layer. The shield is made of a form of metal, for example copper, which is braided, non-braided metal tape or a layer of a conducting polymer. Then, a jacket normally covers up this shield. Below is a description of three examples of shielded cable: fiber optical cables, building wire and coaxial cable.
Fiber Optical Cables
This form of shielded cable is made from a number of optical fibers. Each of these fibers has its own coating of plastic in a number of layers. This acts as a protection for the fiber. The layers act to give strength to the fiber. However, they play no part in its wave functioning. When used indoors, the fiber with its jacket is usually put with a number of flexible fibrous polymer strength members within a plastic cover to form a cable. If the cables are to be used outside, then a more robust construction is needed. Such cables are used mainly in fiber-optic communication. This allows for transmissions over bigger distances and larger bandwidths. They can also be utilized for illumination as well as other applications including fiber lasers and sensors.
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