Polyvinyl chloride, commonly abbreviated PVC, is
a widely used thermoplastic polymer. In terms of revenue generated, it is
one of the most valuable products of the chemical industry.
is one or more wires or optical fibers bound together, typically in a
common protective jacket or sheath. The individual wires or fibers inside
the jacket may be covered or insulated and combination cables may contain
both electrical wires and optical fibers.
Electrical wiring in general
refers to insulated conductors used to carry electricity, and associated
devices. General aspects of electrical wiring as used to provide power in
buildings and structures, commonly referred to as building wiring.
Electrical cables may be made
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.
Bulk copper is formed
into wire of varying diameters by drawing it through a series of
dies. Since the drawing process causes the copper to become hard and
brittle, it should be annealed.
twisted into cords which will be used in making flexible wire and cable.
The copper conductors, whether they are single wire or multiple
stranded wire, are covered by PVC for current insulation.
cables are formed by sheathing twin-core or multiple-core PVC insulated
copper conductors with PVC.
conductors to reduce AC losses which are due to skin and proximity effect.
Installation to bear thermal and thermo-mechanical stresses at continuos
normal and short circuit temperature condition.
protection against most forms of electrolytic and chemical corrosion.
and resilient sheath with excellent fire retarding qualities.
non-hygroscopic insulation almost unaffected by moisture.
current and short circuit current rating.
domestic electric cable is bound to increase firstly, due to ambitious
programme for electrification and house building secondly, due to
renovation job as old cable has to be removed to avoid any short circuit
due to ageing with new advanced cable of high conductivity in given size
with perfect insulation against any electric fault.
consumption of European PVC cable market is 428 kt. Taiwan, the Republic
of China, a country with a population of only 19 million, has more than
one hundred factories successfully producing electric wire and cable to
satisfy the needs of the domestic market. According to an estimate, the
total production of electric wire and cable had reached a level of 200,000
tons per year.
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