Aerial Bunched Cable (ABC), 1.1 K.V. volt Grade, are used for disturbing power to individual consumers by utility service providers like Nepal Electricity Boards, electricity distributing authorities. The cable is kept supported on poles. The line is taped intermittently form any required position which enables it to be used in urban as well as rural areas.
PRODUCT CONSTRUCTION
STANDARDS
IS:14255-1995, BS-7805, IS:8130-1984, IS:398(P-4)-1994, IS:7098(P-1)-1988
CONDUCTOR
Phase or lighting Conductor: hard drawn Aluminium H2 or H4 grade as per IS: 8130, Messenger conductor: Aluminium Silicon and Magnesium Alloy used after treatment as per IS: 398 (Part4)
INSULATION
XLPE applied by extrusion process.
IDENTIFICATION OF PHASE
By providing ridges on the insulation of Phase Conductors. One ridge for 1st phase, 2 and 3 ridges for 2nd and 3rd phases respectively. Neutral can have 4 ridges, if desired.
COLOUR OF INSULATION
Because the cable remains exposed to environments & sunlight (Ultraviolet radiation) the insulation is mixed with a small amount of carbon back to stop deterioration of polythene due to UV radiation.
ASSEMBLING
The phase conductor along with the lighting conductor (where applicable) is twisted around messenger conductor.
CONSTRUCTION
The phase conductor can be of single phase and also of three phases. Lighting conductor can be also incorporated to give supply to the street lighting. Messenger conductor supports the weight of the cable and keeps the assembly strung under tension. The phase conductor is made of concentrically stranded Aluminum wires having 7 or 19 wires. The messenger conductor is made of specially treated silicon, Magnesium Aluminum alloy having 7 wires. The phase conductor and lighting conductor where applicable are insulated with XLPE compound. The messenger conductor, as per customer’s choice is kept either bare or insulated. The phase conductor along with lighting conductor (where applicable) are twisted around the messenger conductor (insulated or bare) and left as such. Sometimes as a special care a neutral conductor is also provided separately if desired, by the user. Generally messenger acts as well as neutral.
This type of construction has the following additional advantages:
Cables are lighter in weight
Easy to install
Can be installed on poles, on walls etc.
Easy to make termination and branch off joints on live wire as well.
Protection against power theft