Power Cables

Power cables are made of copper / aluminium conductor, PVC / XLPE insulated having voltage rating upto 1100 V AC / 1500 V DC armoured / unarmoured with PVC outer jacket made as per IS 1554 Part-1, IS 7098 Part I, BS 5467, IEC 502, any other international standard or customer specification.

Size : 1.5 Sq.mm. to 630 Sq.mm. in 2 to 4 core.
1000 Sq.mm in single core

Conductor - Annealed Bare Electrolytic Grade Copper / Aluminium Conductor conforming to IS:8130:1984. Shaping of Conductor is applied above 10.0 Sq.mm. in Aluminium & 6.0 Sq.mm. in Copper.

Insulation - Type A PVC Compound capable of withstanding conductor temperature upto 70 degrees C for general purpose insulation & 85 degrees C for Heat Resistant insulation conforming to IS:5831:1984 or XLPE insulation for conductor temperature upto 90 degrees C.

Colour Of Cores : Cores are identified with a colour scheme as per IS:1554(Pt-I):1988 as under :

• Cores - Red, Black, Yellow, Blue or Natural (non-pigmented).
• Cores - Red & Black
• Cores - Red, Yellow & Blue.
• Core - Red, Yellow, Blue & Black.(Reduced Neutral Core in case of 3 ½ Core)
• Cores - Red, Yellow, Blue, Black & Grey

In case of cable exceeding five cores, two adjacent (counting and direction cores) in each layer shall be coloured Blue, Yellow and remaining cores grey or cores can be identified by numbers by numbers printed on that of same colour.

Laying Of Cores - Cores are laid up as per the above colour scheme. The final lay direction shall be kept right hand.

Inner Sheath - The Inner Sheath is applied over laid up of cores by extrusion / wrapping of thermoplastic material.

Armoring - It is applied over inner Sheath. It may consist of galvanized Round Steel wires or galvanized Flat Steel Strips conforming to IS:3975. Round Wire armouring is provided , where the calculated diameter under armour is 13.0 mm. Above this, armouring is either round wire/steel strip. In single core cables used in AC systems, armoring I done by non-magnetic hard drawn aluminum wires / strips

Outer Sheath - A final covering of PVC Compound, conforming to IS:5831:1984, is applied over Armouring in case of Armoured Cable or over Inner Sheath in case of Unarmoured Cable, called as "Outer Sheath".

The insulation, inner sheath & outer sheath can be of HR PVC, FRLS PVC, FRHF (Flame Retardant Halogen Free) or ROHS Compound depending upon the application.

DIMENSIONS & WEIGHTS OF ORIENT CAB PVC INSULATED POWER CABLES CONFIRMING TO IS:1554 / Par t 1 / 1988 1.1 KV

Single Core PVC insulated & sheathed unarmoured & armoured cable with Aluminium Conductor conforming to IS:1554 / Part 1 / 1988

Two Core PVC insulated & sheathed unarmoured & armoured cable with Aluminium Conductor conforming to IS:1554 / Part 1 / 1988

Three Core PVC insulated & sheathed unarmoured & armoured cable with Aluminium Conductor conforming to IS:1554 / Part 1 / 1988

Three and Half Core PVC insulated & sheathed unarmoured & armoured cable with Aluminium Conductor conforming to IS:1554 / Part 1 / 1988

Four Core PVC insulated & sheathed unarmoured & armoured cable with Aluminium Conductor conforming to IS:1554 / Part 1 / 1988

CROSS LINKED POLYETHYLENE (XLPE)
XLPE means cross-linked polyethylene or vulcanize polyethylene. The basic material is low density polyethylene. Polyethylene is a thermoplastic material consisting of long chain of hydrocarbon molecules. At elevated temperatures these molecules tend to move relative to one another so that the material becomes increasingly deformable and will eventually melt at the temperature around 110°C. By means of process similar to the vulcanization or rubber the polyethylene molecules can be cross-linked. The process of cross linking or vulcanization consists or producing chemical bonds at interval between the long molecular chain to give a “ladder” effect which prevents slippage between molecules. As a result of cross-linking the material becomes heat resistant and does not soften at higher temperatures. Further it has better resistance to stress cracking and good resistance to ageing in hot air. With the change of structure there is no adverse effect on electrical properties.

LT-XLPE CABLES ARE SUPERIOR OVER PVC CABLE SINCE THEY

• Have longer life as compared to conventional PVC Cables.
• Have higher conductor temperature rating i.e. 90°C as against 70°C of PVC and hence higher current rating.
• Have higher emergency overload capacity than PVC Cables (upto 60%).
• Have max. Temperature limit under short circuit conditions 250°C as a against 160°C for PVC Cables and hence have ` higher short circuit rating.
• Have moisture resistance of nearly 100 times that of PVC.
• Have very high insulation resistance compared to PVC (as high as 1000 times).
• Have high corrosion resistance in polluted atmosphere as compared to PVC Cables.
• Have better properties of resistance to chemical and corrosive gases.
• Have low installation cost because of light weight, dimensions and are far more flexible.
• Have better properties to withstand vibration, hot impacts.
• Have easier & quicker jointing.
• And are ideal for transmission and distribution of power.

COMPARISON OF MAIN PROPERTIES BETWEEN PVC AND XLPE INSULATION

DIMENSIONS & WEIGHTS ORIENT CAB XLPE INSULATED POWER CABLES CONFIRMING TO IS:7098 (PART-1) 1988 1.1 KV

Single core XLPE insulated unarmoured & armoured cable with aluminium conductor conforming to IS:7098 (Part 1) 1988

Two core XLPE insulated unarmoured and armoured cable with aluminium conductor conforming to IS:7098 (Part 1) 1988

Three core XLPE insulated unarmoured and armoured cable with aluminium conductor conforming to IS:7098 (Part 1) 1988

Three & A Half Core XLPE Insulated Unarmoured and Armoured cable with Aluminium Conductor Conforming to IS:7098 (Part 1) 1988