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Poly-Al Construction

Reference:

1. Copper Conductor
2. Extruded Semi-Conducting XLPE
3. XLPE Insulation
4. Semi-Conducting XLPE
5. Moisture Barrier Tape
6. Copper Wire Screen
7. Counter Helix Copper Tape
8. Water Blocking (swellable) Tape
9. Poly-Al Tape
10.HDPE sheathed with graphite coat on surface

Conductor : The conductor consist of annealed copper wires compacted having a smooth circular shape for sizes upto 1000 mm cross- sectional area conforming to IEC : 60226 or IS 8130-84.

Note :
1. ln special cases, Aluminium Conductors are provided depending on specific need of the customer.
2. Beyond1000 mm2 Milliken Conductors (segmental) are recommended


Conductor screen : The conductor screen consists of a layer of smooth black extruded semi - conducting XLPE compound firmly bonded with the insulation. This eliminates electrical discharges at the interface between conductor and insulation.

Insulation : The insulation consists of super clean XLPE compound. This extrusion process is conducted in clinically clean environment. The insulation Thickness conforms to IS : 7093 {Part3}.

Insulation Screen : The screen consists of smooth black serni-conducting XLPE compound firmly bonded with a smooth interface with the insulation. The conductor screen, insulation and insulation screen and extruded simultaneously in Dry- Cure Process

Moisture Barrier : To make the cable longitudinally watertight a semi- conducting tape is applied over the core, to prevent water penetration in the cable. The tape is of non - woven material which has non - biodegradable characteristics.

Copper Wire Screen : Copper Wires are applied to carry the necessary earth fault current. A counter open helix copper tape is provided over the copper wires.

Poly - Aluminium Foil : Aluminium Foil coated with Polyethylene used longitudinally as a oisture barrier is designed for making cable lighter in weight.

Jacketing : The Jacket material consists of Extruded Black PVC (ST2) or High Density Polyethylene (HOPE). A graphite coat is provided over the outer surface of the sheath.

 

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