Construction
Conductor
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Insulation
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Twisting and Laying
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Core Identification
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Overall Screen
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Individual & Overall Screen
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Bare / tinned electrolytic annealed
copper conductor
Solid, stranded or flexible confirming to
BS 6360 and IS 8130
PVC or HR PVC insulation in
accordance with IS 5831
Polyethylene insulation in accordance
with BS 6234 / IS 6474.
Required numbers of cores are laid up
in case of multicore core cables
Individual pairs, triads or quads are
formed by uniformly twisting the
insulated cores with short lay lengths,
prior to laying
Cores can be colour coded or number
printed for easy identification
For multi pair cables one core in each
pair is number printed in words as well
as in figures at short intervals of 50mm
or a numbered polyester tape is
provided over each pair
After final lay up of the complete cable
an overall screen of aluminiumpolyester tape is applied
The tape is applied along with 0.5 sqmm
multi stranded annealed tinned copper
(ATC) drain wire in continuous
electrical contact with aluminium side
of the tape Tinned copper braid
screening can also be provided
Individual pairs, triads or quads are
screened by aluminium-polyester tape
along with 0.5 sqmm
ATC drain wire and overall screened by
aluminium-polyester tape as mentioned
above
Tinned copper braid screening can also
be provided
For individually screened cables used in
critical
applications
an extruded
isolation sheath can also be provided
over the individual screens
Assembly Binder
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Only after final assembly a nonhygroscopic polyester tape is provided
to act as a binder as well as a bedding
for the outer screening in all cables
Armour
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Galvanized steel round wire or strip
armour in accordance with BS 5308 / IS
1554 respectively
The armour wire and strip confirms to
IS 3975. If required, G.I square interlock
armour or G.I / S.S wire braid armour
can also be provided
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