CABLE CONSTRUCTION & MANUFACTURING PROCESS
Conductor
: Copper or Aluminium used for the Conductors obtained in the form of 8.0 mm Copper or 9.5 mm Aluminium rods. After testing, rods are drawn into wires of required sizes. These wires are formed into final Conductor in the stranding machines under strict Quality surveillance. : Cross linked polyethylene compound is insulated over the conductors by extrusion process. The raw materials and thicknesses of Insulation are maintained as per standards and conform to IEC 60502 Part-1 or any other International Standard.
Insulation
The Cores of cables are identified either by colour or by numbers as follows:
No. of cores Identification
Old Colour coding
New Colour coding as per BS
1 2 3 4 5
Red or Black Red & Black
Brown or Blue Brown & Blue
Red, Yellow & Blue
Brown, Black & Grey
Red, Yellow, Blue & Black
Blue, Brown, Black & Grey Blue, Brown, Black, Grey & Y/G
Red, Yellow, Blue, Black & Y/G
6- 61
By numbers
By numbers
Laying up
: The insulated cores are laid up with a right hand, or alternating left & right hand, direction of lay in the sequence of the core numbers or colours. Where necessary non-hygroscopic fillers and binder tape is used to form a compact and reasonably circular cable. : All cables have taped bedding under the lead sheath (Extruded bedding can be provided, if required). The bedding material used is compatible with the operating temperature of Insulation material. Thickness of bedding shall be as per IEC-60502-1.
Bedding
Armour
: When armouring is required, the armour (for multi core cables) consists of single layer of galvanized steel wires/galvanized steel tapes. The armour is applied helically as per standards.
Single core cables are armoured with Aluminium Wires or Copper wires based on requirement. Outer sheath : Standard cables are manufactured with Extruded black PVC Type ST-2 compound of IEC 60502-1. Outer sheath is embossed or printed with the information required by relevant standards.
Special FR, FRLS, FRRT, MDPE compounds are used for outer sheathing of cables, to suit customer’s specific requirements.
5
MKK XXS002-02/01-12-2014
Made with FlippingBook Annual report