AERIAL BUNCHED CABLE (ABC)

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Aerial bundled cables (simply ABC) are overhead power lines using several insulated phase conductors bundled tightly together, usually with a bare neutral conductor. This contrasts with the traditional practice of using un-insulated conductors separated by air gaps. This variation of overhead power lines utilizes the same principles as bundled conductors, except that they are closer together to the point of touching but each conductor is surrounded by an insulating layer (except for the neutral line).

CONSTRUCTION

1-CONDUCTOR

A-Phase or Streetlight Conductor

The phase conductor and neutral/street lighting conductors is of H2 or H4 grade aluminium complying with the requirements of IS 8130:1984 and conforms to flexibility class 2 of IS 8130:1984. The size of the street lighting conductor is16 mm²

B-Messenger (Neutral Conductor or Otherwise)

The conductor is heat treated aluminium- magnesium-silicon alloy wire conforming to IS 398 (Part 4):1979.It is either stranded circular or compacted circular type and has minimum 7 strands with smooth surface.

2-INSULATION

The conductor is insulated with crosslinked polyethylene applied by extrusion. The insulation so applied fits closely on the conductor and it is possible to remove without damaging the conductor. The color of insulation is black, offering UV protection.

3-CORE IDENTIFICATION

he phase conductors is provided with one, two or three 'ridges' and outer neutral insulated conductor, if provided, has four 'ridges' for quick identification. The street lighting conductor and messenger conductor (if insulated) does not have any identification mark.

4-ASSEMBLY (LAYING UP)

The required number of insulated phase conductors, one insulated neutral conductor (if required) and a street lighting conductor (if required) is twisted around the bare (or insulated) as required messenger conductor without fillers with a lay not exceeding 35times the diameter of the insulated phase conductor. The direction of lay is right hand.

APPLICATION

Aerial Bunched Cables are suitable for the following functions

LV/MV/HV distribution lines.
In power theft prone areas.
As replacement of bare lines in rural areas, in woods, other localities & narrow street where space is limited
As replacement of bare lines where reliability of supply is of prime importance and where high degree of stability of supply voltage is of importance.
In hilly terrains where cost of erection of overhead lines of underground cable becomes very high.
As reinforcement of existing system without increasing voltage.
For temporary supplies.

ADVANTAGES

Aerial Bunched Cables Lines have very high reliability in maintaining services because conductors are insulated with the best dielectric. The benefits of using this line are:

Safest system because phase conductors are insulated, no risk of danger of accidental touching live conductor.
Less fault rage on account of good protection against line and ground fault by high winds or falling trees or bird especially in hilly areas & forests as encountered in rural distribution networks.
High insulation resistance to earth in all seasons and polluted atmospheres. Negligible leakage currents and low losses
Multiple circuits of power and telephone cables could be strung in the same set of poles or any other supports like walls etc.
Better adaptability to run concurrently with existing over-head bare conductor system without any interference.
High capacitance and low inductance leading to low impedance of lines.
Total lines costs are reduced and maintenance is very easy
Insulation of conductors also helps in preventing corrosion of the conductor.
Cores being insulated, the chances of power thefts are eliminated.
These are cheaper than underground power cables.
Life of Transformers increased as the supply interruptions are minimized.

MANUFACTURING CAPABILITY

SR. NO.	DESCRIPTION	RANGE
1	Cable construction & Area	1CORE X 16 SQMM +1CORE 25 SQMM TO 4CORE X 120+ 1CORE 95 SQMM +1CORE 16 SQMM

PHYSICAL PROPERTIES

SR. NO.	DESCRIPTION	TEMPTATURE
1	Permissible Temp in continuous operation	90°C
2	Temp in a short circuit (duration up to 5s)	250°C

Note: The Catalogue conductor Parameter are informative and can be customized as per Project Requirements

APPLICABLE STANDARD

Aerial bundled cables (simply ABC) can be supplied to meet various National & International Standards as follows

IS-14255, IS 8130 | IEC 60502 Part 1 | NFC 33-209

Phase Conductor (Aluminium)			Street Lighting Conductor (Aluminium)			Messenger Conductor Aluminium Alloy
As per IS 8130 : 1984			As per IS 8130 : 1984			As per IS 398 (Part-4) 1994
Nom. Area	Max. D.C. Conductor Resistance at 20°C	Nom. Thickness of Insulation XLPE/PE	Nom. Area	Max. D.C. Conductor Resistance at 20°C	Nom. Thickness of Insulation	Nom. Area	Max. D.C. Conductor Resistance at 20°C	Min. Breaking Load
Sqmm	Ω/Km	mm	Sqmm	Ω/Km	mm	Sqmm	Ω/Km	KN
16	1.910	1.2	16	1.91	1.2	25	1.380	7.0
25	1.200	1.2	16	1.91	1.2	25	1.380	7.0
35	0.868	1.2	16	1.91	1.2	25	1.380	7.0
50	0.641	1.5	16	1.91	1.2	35	0.986	9.8
70	0.443	1.5	16	1.91	1.2	50	0.689	14.0
95	0.320	1.5	16	1.91	1.2	70	0.492	19.7
120	0.253	1.5	16	1.91	1.2	95	0.357	26.5

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