In multicore cables, cores are
laid up together with a suitable
lay, the outer most layer is laid
up in right hand and successive
layer with opposite lay. The interstices
are filled with non-hygroscopic
material wherever necessary to
make the laid-up cores circular.
The laid up cores are provided
with the PVC inner sheath by extrusion
or by wrapping of PVC Tape. Single
core cables do not have inner
Armouring is applied over inner
sheath incase the calculated diameter
over inner sheath does not exceed
13 mm, the armour consists of
galvanized round steel wires.
Where the calculated diameter
over the inner sheath is greater
than 13 mm the armour generally
consists of flat steel. If required,
the cable can be manufactured
with steel wire where calculated
diameter of cable exceeds 13 mm.
Single core cables are provided
with Aluminium Wire/Strip armouring.
Outer Sheath is of PVC compound
applied by extrusion over Insulation
in case of unarmoured single core
cables, over inner sheath in case
of unarmoured multicore cables
& over armouring in case of
is embossed on the outer sheath
of the cable at regular intervals.
The word ELECTRIC is also embossed
to distinguish these cables from
Mining Cables. The FRLS/FR cables
bear an additional legend FRLS
or FR as the case may be. Any
other information required by
the customer can also be embossed.
round wire armour
(A1) round wire armour
(A1) strip armour
|PVC outer sheath