The
term electric means the system of electrical wires and components in a machine,
car, house etc. It is used for carrying an electric current to an appliance.
The regulation for electrical installation classify as indoor wiring ,outdoor wiring and temporary
wiring.
Indoor or outdoor wiring comprises
all the wires, cords and cables installing within a building together with their fixings and
their means of support and protection. Interior wiring can be installed either
unprotected or protected by the use of insulated wires. Such wiring can be
exposed or open or concealed (which is made under the plaster of the wall).
Outdoor wiring installed with
bear, protected or insulated wires and with cables which may be supported from
the outdoor surfaces of building walls, or strung on
Poles or the support. Temporary
wiring is installed or construction sites for lighting and other purposes and
is intended for a short period of service.
One type of wiring with which
most of us are familiar is that which uses insulated metal sheathed wire. The
commercial insulated metal –sheathed wire is rolled ups in a coil and supplied
in this form .This type consists of one or several insulated conductors
additionally provided with a common cost of insulating bacterial and a covering
metal.
When long lines of insulated
metal sheathed wire are to be installed , the electrical fitters usually take
wire directly off the coil. When short lines are to be installed the required length of the wire is measured out by
means of a rural and taking into account and making allowance
for the connection at branching boxes
etc. Cut of from the coil. Side nippers
are used for cutting the wire. Branch boxes, switches, and wall sockets are
fastened by means of wooden screws. The wire is securely fastened to the wall
by means of clips which are nailed with steel pain. When it is necessary to
bend the insulated metal –sheathed wire conduit bending tongs are used.
The type of wiring just described is suitable for many domestic
purpose, but are occasions, when it is desirable to pass the wires through a PVC pipe (poly vinyl chloride) or conduits (a tube for protecting insulated electric wires) to give added protection. One
type of conductor used consists of an
iron sheath coated with leads. New-a-days PVC pipes are mostly used. These
conduits are first installed according
to fixed routes . Nest, the branch boxes are mounted and finally the
electric wires are in the electric wires are in the conduits. For running the
wires into the conduits an inserting tape of steel is entrance point of the line. This point may be a branch box, ceiling outlet
or the point where a switch is to be connected . The inserting tape is then
pushed through to the next outlet and drawn until the eyelet of the inserting tape gets close to the entrance point. The conducting wires are bared at the ends twisted and tied to the eyelet.
In a factory wires have to be laid on the floor to connect machines. The wires
are usually laid in steel or mounted lining is similar to that of a conduit
with a lead coated iron sheath. It is because greater protection for the
conducting wires is necessary.
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