Suyog Electrical Ltd.

Formation

6 core, 12core, 19core , 24core, 30core with 1.5 sqmm.

Assembly

Indian Railway Standard Specification: IRS S:63 :2014.

Bedding

PVC INSULATED UNDERGROUND, UNSCREENED CABLE FOR RAILWAY SIGNALLING.

Railway Signalling Cables

Sizes Covered

12 C x 1.5 mm

Cable Construction

This PVC insulated Underground, Unscreened, Armoured/Unarmoured and PVC sheathed cables covers the requirement for Railway signalling.

Insulation

‘A’ compound of IS: 5831-84. (General purpose insulation for maximum rated conductor temperature 70° C operation) except for insulation resistance, tensile.

The specific gravity of PVC insulation taken from finished cable shall not exceed 1.42.

Laying Up

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 .

Amouring

Galvanised round steel wire to IS: 3975 with exception to tensile strength and percentage elongation.

Galvanised Double Steel Tape to IS: 3975 with exception to tensile strength and percentage elongation

Sheath

The laid up cores shall be provided with an inner sheath applied by extrusion .

5831-84 except for tensile strength, percentage elongation and shrinkage shall be used for outer sheath

Product Range

The cores of cables shall be identified by different colouring of PVC insulation.
The colours shall conform reasonably with the standard colours shown in IS: 9938 .
Core - Red, black, yellow, blue or grey.
Cores - Red and black.
Cores - Red, yellow and blue.
The core shall be numbered sequentially in clock wise direction, starting with number 1 for the inner layer .

Dealing Range

Conductors of nominal area less then 25 sq. mm shall be circular only. Conductors of nominal area 25 sq. mm and above may be circular or shaped
The insulation resistance (Dry) of each core shall not be less than 10.0 Mega-Ohm per kilometre at 50° C and insulation resistance (Wet) shall not be less than 7.5 Mega-Ohm per kilometre at 50° C for cable conductor sizes upto 2.5 sq. mm
cable conductor sizes more than 2.5 sq. mm, the insulation resistance (Dry and Wet) shall be 5 Megaohms / Km at 50o C

Technical Specification Tables Armoured Unarmoured

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 .
a) Galvanised round steel wire to IS: 3975 with exception to tensile strength and percentage elongation, or
b) Galvanised Double Steel Tape to IS: 3975 with exception to tensile strength and percentage elongation, or
c) Any other material (as agreed between the purchaser and the manufacturer). .
The double steel tape shall be applied helically over the inner sheath with a gap of not more than 50% and minimum overlap of 15%. .
5 The direction of lay of the armour shall be left hand.
The outer sheath shall be applied by extrusion in one continuous process and shall be homogeneous and free from joints and repairs. It shall be applied .
a) Over the insulation in case of unarmoured single core cables.
b) Over the inner sheath in case of unarmoured twin, three and multi-core cables.
c) Over the armouring in case of armoured cables. 3.6.2 PVC compound conforming to the requirements of type ST1 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. Recycled or reclaimed material shall not be used. For finished cable, the specific gravity for outer sheath shall not exceed 1.50. .
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 metre 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:
a) Name or trade mark of the manufacturer.
b) IRS Specification number.
c) Month and year of manufacture.
d) Drum Number.
e) Size of the cable (e.g. 12 C x 1.5 sq. mm)
.

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