LT - XLPE / PVC Cables

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As PVC is a thermoplastic polymer, PVC properties make it suitable for applications where the cables may be exposed to high or low temperatures (including use of arctic-grade PVC for extreme low conditions), or where protection against UV light is required to avoid degradation. PVC insulation is frequently used owing to its good insulating properties but low corona resistance, and is best suited for low and medium voltage cables and low frequency insulation requirements.

The benefits of PVC as cable insulation and sheathing material include its chemical stability, robustness and durability.
Thickness of Outer Sheath
Unarmoured Cables
The average thickness of outer sheath of Unarmoured cables shall not be less than the nominal value specified. The smallest of the measured values shall not be less than 0.2mm + 0.2 ts.

Armoured Cables
The minimum thickness of PVC outer sheath of armoured cables shall Not fall below the nominal value (ts) specified more than 0.2 mm+0.2ts.

Colour of Outer Sheath
Colour of outer sheath shall be black or any other colour as agreed to between the purchase and the supplier.
Advantages of XLPE Insulation
  •  Easy Installation, as the XLPE insulated cables are lesser in weight as compared to PVC Insulated cables of same size.
  •  Higher operating temperature, current rating and overload rating makes XLPE cables more economical to Use.
  •  Higher life span and flexibility as compared to PVC cables.
  •  XLPE Insulated cables have a very high degree of resistance towards Moisture, Oil, Solvent, Acid and Alkalies compared to PVC cables which are moderately resistance to the above conditions.
  •  XLPE Insulated cables have higher short circuit temperature that is 2500C. as compared to PVC Insulated Cables which have short circuit temperature of only 1600C.
  •  XLPE Insulated cables no side effect on health in case of a fire, however PVC cables are Carcinogenic in nature.
Colour of Insulation
Core Cable Red, Yellow, Blue, Black, Grey, Green, White or any colour as per customer Requirement.
Cable Red & Black
Core Cable Red, Yellow & Blue
Core Cable Red, Yellow, Blue & Black
Core Cable Red, Yellow, Blue, Black & Grey
Core & Above Two adjacent cores (counting & direction core) in each layer Blue and Yellow, remaining cores Grey (or) The same sequence as above alongwith indelible printing of core number or All cores same coloured with number printing on the cores at regular interval.
Laying -up The cores are laid up with a suitable right hand lay.
Inner Sheath PVC Type ST-1 of IS: 5831-1984 for maximum conductor temperature 700C.
PVC Type ST-2 of IS: 5831-1984 for maximum conductor temperature 850C.
(For XLPE Cables ST-2 Only)
Application The laid up cores shall be provided with inner sheath applied either by Extrusion or by tape wrapping, as per specification requirement.
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