annealed bare/ uniform coated with tinned/silver
platted, high conductivity, and electrolytic grade solid/stranded/flexible
conductor are insulated with
general purpose pe / hr / frls / lszh / pvc compound / or any other dielectric
material as per customers specification.
colour of dielectric :-
cores are identified with different type of color scheme as per requirement as
- as per is:1554[pt-i]:88, 694:90.
- as per iec, itd
or number printing.
- as per customers scheme.
two/three/four cores are uniformly
twisted together to form a pair/triad/quad with maximum lay length 80 mm/as per
requirement of customer. The lay shall be so chosen as to minimize cross talk in
individual shielding :-
required, individual shielding may be of poly aluminum [thin layer of aluminum
foil bonded to polyester film] tape with annealed tinned copper drain wire. It
prevents the shorting of adjacent shield and minimizes the cross talk and ground
loops. A tinned copper drain wire is installed to provide continuous contact
with the shield and allow to connection to ground. Tinning the drain wire
reduces galvanic corrosion between drain and shield.
pair/triad/quad are laid up with
suitable lay. The outer most layers are right hand lay and successive layers are
laid up with opposite lay. Then, a polyster tape is provided to bind up laid up
overall shielding :-
required, overall shielding may be of annealed tinned copper braiding / poly
aluminum [thin layer of aluminum foil bonded to polyester film] tape with
annealed tinned copper drain wire. Braiding atc shield has high tensile strength
and provides better coverage in flexing application. They are easier to
terminate. This provides effective shielding; cross talk and noise are kept to
an absolute minimum.
inner sheath :-
laid up pair/triad/quad after shielding are provided with an inner sheath, which
may be either extruded inner sheath or wrap with pvc tape.
it is applied over inner sheath. It may consist of
galvanized round steel wires or galvanized flat steel strips.
outer sheath :-
it is applied over armouring in case of
armoured cable or over inner sheath in case of unarmoured cable. The color of
sheath is black or grey. The sheath material may be general purpose/hr / frls /
lszh pvc compound as per requirement of specification.
for connection of instruments, process
control systems, computers, data transmission etc.