power cables

Description

Low Voltage XLPE Cables are manufactured according to IS:7098 (Part -I), up to and including the latest amendments. All cables have the ISI Certification.

XLPE, as insulation has the following superior features:

Low dielectric
Higher power rating and higher emergency overload
Superior short circuit
Much better insulation resistance
Higher resistance to moisture
Capacity to withstand localized hot spot temperature, very vital to steel plants, power stations, etc.
Resistant to chemicals and corrosive gases,
Exhibits better properties, such as resistance to vibration, impact, aging, and hot
Termination and jointing methods are very easy, simple, and non-expensive as compared to other cables.
DESIGN AND CONSTRUCTION
CONDUCTORS

The conductors of power cables are made from electrical purity aluminum, and those of control cables are of annealed high conductivity copper. However, copper conductor power cables can also be supplied against orders. All conductors conform to IS:8130-1984.

INSULATION

A High-quality Cross-Linked Polyethylene (XLPE) unfilled insulating compound is used for XLPE Cables.

LAYING UP

In multicore cables, cores are laid up as per the above color scheme and interstices are filled up wherever necessary to make the laid-up cable circular.

INNER SHEATH

For all cables having two or more cores, a common covering (inner sheath) is applied over the laid-up cores either by an extruded sheath of PVC Compound or wrapping of thermoplastic or proofed tapes.

ARMOURING

For multi-core cables, armor is applied over the inner sheath. In the case of cables where the fictitious diameter over the inner sheath does not exceed 13mm., the armor consists of galvanized round steel wires; above this size, normally the armor is of galvanized formed steel wires. Any metallic, non-metallic wire/strip can be available on request.

OUTER SHEATH

The outer sheath is extruded over the armoring. Outer sheath PVC is Antirodent, Anti termite, and Ultra Violet resistant. In the case of multi-core unarmoured cables, over the inner sheath, whereas, in the case of unarmoured single-core cables, it is extruded over the insulation. This is always black in color for best resistance to outdoor exposure. Any other color can be available on request.

CORE IDENTIFICATION

Colour Scheme: Cores are identified by the color scheme of insulation. The following color scheme is normally adopted:

Core red, black, yellow, blue, or natural (non pigmented)
Core red and black
Core red, yellow and blue
Core red, yellow, blue, and black (also 3½ core reduced neutral is black)
Core red, yellow, blue, black, and grey
For cables having more than 5 cores:

Two adjacent cores (counting and direction core) in each layer are colored blue and yellow respectively and the remaining cores are grey.

Alternatively, cores with number printing can be offered