Wire
& Cables
Wire: A wire is a
single conductor strand or a group of conductor strands, sheathed or coated in
a jacket of insulation to prevent the conductors from making unwanted contacts
or
a wire is
a long thin piece of metal with insulation which is used to carry electric
current.
Classification of
insulated wires:
1. V.I.R. Wire: Its full form is vulcanized Indian rubber wire. In this wire
tinned wire or aluminium conductors are used. The conductor is insulated with
vulcanised rubber. The size of wires is as 1/18, 3/20, 3/22, 720, 7/22 etc. It
is used in conduit pipe wiring, casing and capping wiring etc. This wire is
available in single core only.
2. C.T.S. Wire: Its full form is Cab Tyre Sheathed wire. The other name of
this type of wire is Tough Rubber Sheathed wire (T.R.S. wire). These are
available in single core, twin core and three core. It is manufactured in
single conductor and stranded conductor. The conductor is covered with
vulcanised rubber insulation. These are available in different sizes 1/18,
3/20, 7/22 etc. It is generally used in batten wiring and short distance
overhead lines and service lines
3. P.V.C. Wire: Its
full form is Poly Vinyl Chloride wire. The conductor of this wire is insulated
with P.V.C. insulation. It is manufactured in single core, twin core, three
core and three and a half core. In this wire copper or aluminium conductors are
used. It is available in different sizes 1/18, 3/22, 3/20, 7/22, 7/20 etc.
Now a days it is widely used in domestic and industrial wirings.
Comparison between solid and
stranded conductors
Cable: An electrical cable is an assembly of one or more wires
(core) running side by side or bundled, which is used to carry electric
current. There are two types of cables:
1. Overhead Cable:
An overhead cable is
a cable for the
transmission of electricity & information, laid on poles.
2. Underground Cable:
It can withstand pressure and can be installed below the ground level
(underground) and normally two or more conductors are placed in an UG cable
with separate insulation on each conductor.
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