POLYCAB LT XLPE INSULATED HEAVY DUTY CABLES 650/1100V

XLPE insulated heavy duty cables were introduced worldwide in mid-sixties. These cables have overcome the limitations of PVC insulated cables such as thermal degradation, poor moisture resistance and thermoplastic nature.

The advantages of XLPE insulated cables in comparison to PVC insulated cables are as under.
APPLICATION:

The cables are suitable for use on AC single phase or three phase (earthed or unearthed)systems for rated voltage up to and including 1100 Volts. These cables can be used on DC systems for rated voltage up to and including 1500 Volts to earth.

Polycab Cables of 0.6/1(1.2)KV 4C X 300 Sq.mm,1C X 800 Sq.mm has been successfully type tested at DEKRA-Netherland

A. Technical Advantages:

Higher current rating, higher short circuit rating approx. 1.2 times that of PVC.
Thermosetting in nature
Higher insulation resistance 1000 times more than PVC cables.
Higher resistance to moisture
Better resistance to surge currents.
Low dielectric losses.
Better resistance to chemicals.
Longer service life.
Comparatively higher cable temperature 90° C and short circuit temperature 250° C.

B. Commercial Advantages:

Lower laying cost because of comparatively smaller diameter of cable and higher weight*.
Lower installation charges as the diameter of cable is comparatively lesser with smaller bending radius,
required less space requirement for laying cables.
** One size lower cable can be used as compared to PVC insulated cable.
* Density of XLPE is lower than PVC
** For longer cable length voltage drop shall be considered.

Basic assumptions
The current rating given as per before mentioned following assumptions
Maximum conductor temperature :90°C
Thermal resistivity of soil :1.5K.m/w
Ground temperature: 30°C
Ambient air temperature :40 °C
Dept of laying (measured to: 750 mm)