Power & Control Cables
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These cables can be used on AC Voltage up to & including 1100 V or DC up to & including 1500 V.
Size
2.5 Sq. mm. to 400 Sq. mm. up to 4 Core in Power Cable & 1.5 Sq. mm. & 2.5 Sq. mm. up to 61 Cores in Control Cable.
Insulation
Specially formulated. hi-grade PVC Compound capable of withstanding conductor temperature up to 70C for General Purpose insulation (Type A): & HR PVC 85C (Type C) for Heat Resistance insulation conforming to IS: 5831: 1984. The insulation is resistance to moisture, oils, alkalis, grease etc. It has good dielectric properties, higher insulation resistance permanent colour.
Colour of Cores
Cores are identified with a colour scheme as per IS: 1554 (Pt-1): 1988 as under.
- Cores- Red / Black / Yellow/ Blue or Natural (non- pigmented)
- Cores- Red 7 Black
- Cores- Red, Yellow & Blue 3 1/2 & 4 Cores- Red, Yellow, Blue & Black. (Reduced neutral Core in case of 3 1/2 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/ Cores can be identified by number printed on that of same colour.
Laying of Cores
Cores are laid up with a suitable lay. The final layer direction shall be kept right hand lay.
Inner Sheath
The inner Sheath is applied over laid up of cores by extrusion/wrapping of thermoplastic material.
Armouring
It is applied over inner Sheath. It may consist of Galvanized Round Steel wires of Galvanized Flat Steel Strips confirming 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 long run of cables and in case of mines, the round wire armouring is must as strip construction provides higher resistance to Earth fault Current and sometimes this current may not be sufficient to operate the circuit breaker in case of earth fault. In mines, the resistance of armour shall not be more than 33% of the resistance of main core for safety reasons. To achieve this, sometimes, tinned hard drawn copper is used along the galvanized steel wires. Sometimes, two layers of steel wires are provides to give extra protection.
Outer Sheath
A final covering of PVC Compound, confirming to IS: 5831: 84, 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 HR PVC, FRLS PVC or FRHF Compound depending upon their application.
Typical Application
The Power & Control Cables are used under ground as well as over head transmission of power in power plants, industries, projects and all other electrical installations.