Aerial Bunched Cable (ABC), also known as Aerial Bundled Cable, is an overhead power distribution system consisting of multiple insulated conductors bundled tightly together, generally with a bare neutral conductor. Unlike conventional overhead systems that use uninsulated conductors, ABC systems provide insulated power distribution and are suitable for low- and medium-voltage applications.
ABC cables are available in low-voltage aerial bundle cables, medium-voltage aerial bundled cables, and duplex/triplex service drop wires. They are used for overhead power distribution in urban, rural, forest, hilly, coastal, and other difficult or congested locations. Their insulated construction improves safety, reduces the likelihood of short circuits caused by external contact, and permits installation within narrower rights-of-way.
The system also offers simplified installation because crossbars and conventional insulators are generally not required. Other benefits include reduced maintenance requirements, improved appearance, easier fault detection, and greater resistance to electricity theft. However, ABC systems have limitations, including higher cable cost, increased line weight, shorter spans, greater pole requirements, insulation degradation from sun exposure, and potentially longer repair times in difficult terrain.
ABC technology is therefore considered a practical alternative to conventional bare-conductor overhead distribution, particularly where safety, reliability, space constraints, vegetation, and difficult terrain are important considerations.
| Particulars | Value |
|---|---|
| Plant Capacity | 205.36 KM/Day |
| Land & Building (18,000 sq.mt.) | Rs. 17.14 Cr |
| Plant & Machinery | Rs. 6.83 Cr |
| Working Capital for 2 Months | Rs. 160.65 Cr |
| Total Capital Investment | Rs. 185.21 Cr |
| Rate of Return | 47% |
| Break Even Point | 26% |
An Aerial Bunched Cable (ABC) is an overhead power distribution cable made by bundling insulated conductors together, generally with a neutral conductor.
Unlike conventional overhead distribution systems that use bare conductors, ABC systems provide insulation around the conductors. This construction improves safety and reduces the likelihood of short circuits caused by accidental contact with trees or other external objects. ABC cables are used for low- and medium-voltage power distribution and are particularly useful in congested urban areas and difficult terrains.
The main types of ABC cables covered in the report are low-voltage aerial bundle cables, medium-voltage aerial bundled cables, and duplex/triplex service drop wires.
Low-voltage cables are used for overhead distribution and service connections, while medium-voltage aerial bundled cables are suitable for power distribution networks in urban, forest, coastal, and other challenging environments. Duplex and triplex service drop wires are used for overhead service applications such as street lighting, outdoor lighting, and temporary building services.
ABC cables offer improved safety, simplified installation, lower maintenance requirements, and better suitability for congested or difficult locations.
The bundled insulated construction provides relative immunity to short circuits caused by external forces and allows cables to be installed closer to trees. The system can also require fewer conventional crossbars and insulators, occupy a narrower right-of-way, reduce visual clutter, and make electricity theft more difficult to conceal. These characteristics make ABC systems useful for urban, rural, hilly, forest, and coastal distribution networks.
ABC cables are commonly used for overhead power distribution in urban, rural, forest, hilly, coastal, and congested areas.
They are particularly suitable where conventional bare-conductor systems are difficult to install or maintain. In narrow urban lanes and developing urban complexes, their compact bundled construction can provide greater flexibility for routing. They are also useful in locations with vegetation or challenging terrain because insulated conductors can reduce the risk associated with incidental contact with trees and external objects.
ABC cable manufacturing commonly uses aluminium or aluminium alloy conductors together with suitable insulation and other cable components.
The report identifies aluminium, copper, and aluminium alloy conductors across different ABC cable types. XLPE is identified as a principal insulation material for medium-voltage applications, while PVC or XLPE may be used for duplex/triplex service drop wires. Other components can include neutral or messenger conductors, semiconductor compounds, copper screens, bedding materials, and protective outer sheaths, depending on the cable design and voltage class.
ABC systems can have higher cable costs, greater line weight, shorter spans, and more demanding repair requirements in difficult terrain.
The report also notes that insulation can degrade with prolonged sun exposure. Increased cable weight may require shorter spans and additional poles. In hilly areas, repairs can take longer because heavier lines may require larger or specialized equipment. Older installations can also present fire risks where falling trees or branches damage conductors or insulation, potentially resulting in short circuits and burning insulation.
Electrical power cable quality testing includes type tests, acceptance tests, and routine tests as specified for the relevant cable design and standard.
The report specifically lists tests on phase/street light conductors and messenger conductors, physical testing of XLPE insulation, insulation thickness testing, and high-voltage testing under type tests. Quality control during manufacturing is important to verify conductor characteristics, insulation performance, dimensional requirements, and electrical integrity before cables are supplied for power distribution applications.
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