|
Polyethylene
insulated, aluminium screened in the form of
wire/strip, galvanized steel tape armoured &
PVC jacketed special signaling cable required
for Axle counter installations suitable for
use in electrified areas.
|
|
Conductor
- Each conductor consists of a round wire
of annealed high conductivity copper.
|
|
Insulation
- Each conductor is insulated with solid
medium/high density polyethylene insulation.
|
|
Quadding
- Four insulated conductors stranded to
form a star quad , two conductors diagonally
opposite forming one pair and the remaining
two diagonally opposite conductors forming the
second pairs of the quad.
|
|
Laying
Up - The quads are assembled to form a
symmetrical core with a right hand lay. Polyethylene
strings of required diameter may be used as
fillers, if necessary , for proper circular
core formation.
|
|
Filling
and core wrapping - The cable core is fully
filled with water resistant compound which is
compatible with the polythene insulation of
the conductors. The filled cable core is wrapped
with at least one helical or longitudional polythene
tape.
|
|
Poly-Al
Laminate Moisture Barrier - Aluminium tape
,coated with polythene on both sides is applied
longitudinally over the cable core with a specified
overlap. The tape is sealed and bonded to the
inner surface of the polythene sheath.
|
|
Sheathing
- The screened cable core is sheathed with
black polythene compound as per BS:6234.
|
|
Screening
and protection - The cable core with inner
sheath is surrounded by a reasonably close fitted
screen of Aluminium in the form of wires/strips/welded
aluminium tubing. The aluminium screen is wrapped
with a single layer of woven tape impregnated
with Barium chromate with a specified overlap.
|
|
Intermediate
sheath - Further protection of screening
is provided by extruded PVC sheath over screening.
|
|
Armouring
-The cable is armoured with two applications
of galvanized steel tape each applied helically
with a specified gap. The second tape covers
the gap left by the first tape.
|
|
Jacketing
- The armoured cable is finally jacketed
with black PVC compound meeting the requirements
of specification.
|
|
Conductor Diameter
|
Conductor Resistance at
20ºC (Solid or Foam Skin Cable)
|
Attenuation at 150 KHz.
|
|
0.90mm
|
28 (Each Core) Ohm/Km (Max)
56 (loop) Ohm/Km (Max)
|
4.40 dB/Km (Max. Avg.)
at 150KHz
2 dB/Km (Max. Avg.)
at 300-3400 Hz
|
|
Mutual Capacitance
|
Capacitance Unbalance
|
|
50 +/- 2.5 nF/Km (avg.)
50 +/- 6 nF/Km (individual)
|
Pair to Pair
300 pF/Km (max.)
|
Pair to Earth
1500 pF/Km (max. avg.)
|
|
Insulation Resistance
5000 mega Ohms / Km (min.)
|
|
ELFEXT : 55 dB/Km (min.)
at 150 KHz.
67.8 dB/Km (RMS) at 150 KHz.
|
NEXT : 55 dB (min.) at
150 KHz
|
|
Reduction Factor ( Field
intensity of 50v to 450v) : 0.10 (Max)
|
|
Characteristic
impedence
470 +/- 15% Ohms at 0.8KHz
195 +/- 15% Ohms at 5.0 KHz
|
|
