PVC INSULATED ARMOURED UNSCREENED UNDERGROUND RAILWAY SIGNALLING CABLE
LUMINO Railway Signalling Cables are used for signalling circuits in railway networks to connect the signalling equipment centre to the track-side equipment.
Excellent resistance to high and low temperature. Resistance to oil, damp and humid weather conditions. Low reduction factor.
This specification covers the requirements and tests for armoured and unarmoured single core, twin core, three core and multi-core copper conductors PVC insulated and sheathed cables for railway signalling. This specification covers the complete requirement of underground (u/g), unscreened (u/s), and railway signalling cable. The cable covered in this specification shall be suitable for use on AC systems (earthed or unearthed) for rated voltages upto & including 1100 volts. These cables may be used on DC systems for rated voltages up to and including 1500 volts to earth. The cables covered in this specification or suitable for use where the combination of ambient temperature and temperature rise due to load results in a conductor temperature not exceeding 70°C.
Note: For a single core in the centre of a multi core cable, red or black colour shall be used. For 2, 3, 4, or 5 centre cores, the colours shall correspond to these specified for 2, 3, 4, or 5 core cable respectively. Alternatively the cores of cables with six core and above may be identified by numbers 1, 2, 3, 4, 5 …………Printed indelibly at intervals of not more than 50 mm..
In that case, the insulation of cores shall be of grey colour and printing of number shall be black. The core shall be numbered sequentially in clock wise direction, starting with number 1 for the inner layer. Thenumbers shall be printed in the English numerals on the outer surface of the cores. The numbers shall be legible. The consecutive number shall be inverted in relation to each other .When the number is a single numeral, a dash shall be placed underneath it. If the number consist of two numerals, these shall be disposed one below the other and a dash shall be placed below the numerals
The cores of twin three and multi-core cables shall be laid-up together with suitable lay. The outermost layer shall have right hand lay and the successive layers shall be laid with opposite lay. Way of counting from inner to outer layer continuously shall be unidirectional. Where necessary, the interstices shall be filled with non-hygroscopic material.
A Malinex tape / Polyester tape of thickness 0.025 mm shall be applied helically with left hand lay with minimum overlap of 30% over the laid up cores where DST armouring is provided.
The laid up cores shall be provided with an inner sheath applied by extrusion. It shall be ensured that it is a
circular as possible.
The Inner sheath shall be so applied that it fits closely on the laid up core and it shall be possible to remove it
without damage to the insulation. PVC used shall meet the requirements of type ST-1 (General purpose sheath for use at maximum rated conductor temp. 70°C) compound of IS: 5831-84. Re-cycled or Re-claimed material shall not be used. The Colour of the
PVC for Inner Sheath shall be Grey.
Armouring shall be applied over the insulation in case of single core cables and over the inner sheath in case of twin, three and multi-core cables. Armouring shall consist of the following:
Where the calculated diameter below armouring does not exceed 13mm, the armour shall consist of galvanized round steel wires only. Wire armouring shall be applied below 12 Core of 1.5 mm² conductor nominal cross sectional areas.
12 core and above of 1.5 mm² of any other sizes of conductor where the calculated diameter below armouring is greater than 13mm, the armouring shall consist of Double Steel Tape.
The outer sheath shall be applied by extrusion in one continuous process and shall be homogeneous and free from joints and repairs. PVC compound conforming to the requirements of Type ST-1 compound to IS: 5831-84. Except for tensile strength, percentage elongation and shrinkage shall be used for outer sheath. The colour of the outer sheath shall be black. Re-cycled or Re-claimed material shall not be used.
The following information shall be legibly and indelibly indicated throughout the length of the cable by embossing them on the outer sheath at every one meter having letter height not less than 3 mm in case of cables upto 6 Core and 5 mm in case of cables more than 6 Core.
Finished cable is being supplied in non-returnable wooden drum
Quality is not an act, it's a habit. At Lumino, quality has always been a journey and not a destination. At Lumino, quality control checks exist at every stage-right from procuring raw materials to the end product.
