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ELECTRICAL CABLE

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. A cable assembly is not necessarily suitable for connecting two devices but can be a partial product (e.g. to be soldered onto a printed circuit board with a connector mounted to the housing). Cable assemblies can also take the form of a cable tree or cable harness, used to connect many terminals together.

CLASSIFICATION
  • Low Voltage or L.T Cable up to 1000V
  • High Voltage or H.T Cable (above 1000V to 11KV)
  • Super Tension or S.T Cable (above 11KV to 33KV)
  • Extra-High Voltage or E.H.T Cable (above 33KV to 66KV)
  • Extra Super Voltage or E.S.T Cable (above 66KV)
SPECIFICATIONS
  • N = VDE German Electrical Engineers.
  • Y = PVC Insulated.
  • F = Galvanized Steel Flat Wire Armoring.
  • Gb = Galvanized Steel Tape.
  • Y- PVC Sheath (Outer Sheath)
  • re = Conductor of Single Solid Wire Having Circular Cross Section.
  • rm = Conductor of Multiple Stranded Wires Having Circular Cross Section.
  • sm = Conductor of Multiple Stranded Wires Having Sector Shape Cross Section.
APPLICATIONS

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. Tight lays during stranding makes the cable extensible (CBA – as in telephone handset cords).

Source : Wikipedia, anelectricalengineer, Kupandu

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