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Basic Design
Conductor
The construction of the conductors shall be as follows :
Nominal Cross-Sectional Area Solid / Stranded Flexibility Class
Copper (sq mm) Aluminium (sq mm)  
1.5 1.5 Solid Class 1 of IS: 8130 / IEC :60228
2.5 to 6 2.5 to 10 Solid/Stranded Class 1 of lS:8130 / IEC:60228
10 & above 16 & above Stranded Class 2  of lS: 8130/ IEC:60228

Conductors of nominal area less than 16 sq mm are circular only. Conductors of nominal area 16 sq mm and above may be circular or sector shaped.

Insulation : The conductors are insulated with XLPE (Cross linked Polyethylene) by extrusion process. Core Identification: Cores are identified by coloured XLPE insulation Following colour schemes are adopted

1. Core : Red, Black. Yellow or Blue
2. Cores : Red and Black
3. Cores : Red. Yellow and Black
4. Cores Red, Yellow, Blue and Black


Inner Sheath :The cores of multicore cables are laid up and surrounded by PVC covering either by extrusion or by trapping.

Armour : Armouring is of two types - galvanised round steel wire or galvanised steel strip.

Outer Sheath : This is provided by means of extruded Polyvinyl chloride (PVC) compound conforming to the requirements of Type ST-2 compound of IS: 5831.

 
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