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. |
