ADVANTAGES OF XLPE INSULATED CABLES

• Does not soften beyond the normal range of conductor operating temperatures and is called THERMOSETTING insulation.

• Due to greater capacity to withstand heat, the permissible maximum continuous conductor operating temperature is 90˚C and for momentary short circuits the permissible temperature is 250˚C.

• Higher insulation strength and superior mechanical properties allow lower insulation thickness.

• XLPE insulation dissipates heat from conductors much faster as its thermal resistivity is 3.5˚C m/W.

• Volume resistivity is much higher than PVC. i.e. >10 15 Ω cm.

• Heat generation in the insulation itself is low due to very low “loss angle”.

• Due to the foregoing reasons, an XLPE cable can carry 15% to 30% higher current than a PVC cable with the same conductor size.

• Density of XLPE is 0.92 to 0.94 g/cm 3 and due to lower insulation thickness, insulation consumption index is 1/3 of PVC. Therefore XLPE insulated cables are lighter and easier to install.

• Jointing and terminating of XLPE insulated cables does not require any special techniques.

• Don’t emit toxic Halogen gases under fire condition.

• More resistance to oil, acids and alkali.

• Longer operation life due to more resistant to stress cracking.

SPECIFICATION & CONSTRUCTION

CONDUCTORS

A conductor is the metallic part of cables that is carrying the electric current.

Material of Conductor could be:

• Plain annealed or tin coated copper conductor (ASTM B49)
• Aluminum (to ASTM B233)

The conductor structure is complying with the requirements of BS EN 60228 (IEC 60228).

Conductor can be solid, stranded, non-compacted, circular compacted or compacted sector shaped depending upon requirement.

INSULATION

Each core conductor is insulated by extruded Cross Linked Polyethylene XLPE complying with IEC 60502-1. The insulation thickness is selected based on the designated voltage rate complying with IEC 60502-1 & BS 5467 suitable for 0.6/1.0 KV.