XLPE Cables

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Cross-linked polyethylene (XLPE) is a thermosetting compound. It softens at the crytahne melting point of polyethylene (85°C to 115°C) and assumes an elastic rubber like consistency, a property that it retains during further rise of temperature until it becomes carbonized without melting at 250°C to 300°C. All this strengthens LT-XLPE cables against stress cracking and gives them a greater resistance to fight ageing in hot air.

Conductor
Conductors are made from electrolytic grade aluminium/copper conforming to IS:8130, and are compact circular or compact shaped.
Insulation
HMT XLPE insulated cables are specially made high grade cross-linked polyethylene for insulation by extrusion process.

Core Identification
Different colours identify the cores

Single core	Black
Two Core	Red & Black
Three Core	Red, Yellow & Blue
Four Core	Red, Yellow, Blue & Black
Three and half Core	Red, Yellow, Blue and reduced neutral core in Black

Laying up
In multi-core cables, cores are laid up as per the above colour scheme, interstices are filled wherever necessary to make the laid up cores circular.

Inner Sheath
Laid up cores are bedded over with thermoplastic material for protection against mechanical and electrical damage.

Armouring
Armouring is provided over the inner sheath to guard against mechanical damage. Armouring is generally of galvanized steel wires or strips (In single core cables used in AC system armouring is by non-magnetic hard aluminum wires/strips). Round steel wires are used where the diameter over the inner sheath does not exceed 13mm. Above 13mm, flat steel strip armour is used. Round wire of different sizes can be provided against specific request.

Outer Sheath
Specially formulated heat resistant black PVC compound confirming to the requirement of Type ST-2 of IS:5831-1984, extruded to form the outer sheath. HMT XLPE offers a specially formulated Flame Retardant Low Smoke Compound(FRLS) for outer sheath used in fire hazardous environment.

Tests
In addition to all tests as required by IS:7098 Part-1, HMT XLPE Cables are subjected to a number of in-house tests at every stage of production. Incoming raw material is also tested thoroughly to ensure consistency of quality.

Product Code
As per IS:7098 Part-1, the codes are:

Constituents	Code
Aluminum conductor	A
HMT XLPE insulation	2X
Steel round wire armour	W
Steel strip armour	F
Steel double round wire armour	WW
Steel Double strip armour	FF
Non-magnetic (A1) round wire armour	Wa
Non-magnetic (A1) strip armour	Fa
PVC outer sheath	Y

Cable Type	Manufacturing Range	Relevant Specification
XLPE Power Cables with Aluminum Conductor 1.1KV	S/core upto 1000 mm²; Multi-core upto 400 mm²	IS 7098/Part-1/1988
Control Cables with copper conductor	Upto 61 core	IS 7098/Part-1/1988

Know the Superior Product - The LT-XLPE Cables

• LT-XLPE Cables have longer life as compared to conventional PVC Cables.
• LT-XLPE Cables have higher conductor temperature rating i.e, 90°C as against 70°C of PVC and hence higher current rating.
• LT-XLPE Cables have higher emergency overload capacity than PVC Cables (upto 60%).
• Max. temperature limit under short circuit conditions for LT-XLPE Cables is 250°C as against 160°C for PVC Cables. Hence XLPE cables have higher short circuit rating.
• The moisture resistance of LT-XLPE Cables is nearly 100 times that of PVC.
• Insulation resistance of LT-XLPE Cables is very high as compared to PVC Cables.
• LT-XLPE Cables have high corrosion resistance in polluted atmosphere as compared to PVC Cables.
• LT-XLPE Cables have better properties of resistance to chemical and corrosive gases.
• LT-XLPE Cables have low installation cost because of light weight, dimensions and are far more flexible.
• LT-XLPE Cables have better properties to withstand vibrations, hot impacts.
• Jointing of LT-XLPE Cables is easier and quicker.
• LT-XLPE Cables are ideal for transmission and distribution of power.