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OUTDOOR CABLES

L.T. AERIAL BUNCHED CABLE

Application

    Aerial Bunched Cables are suitable for the following functions
  • 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 under ground cable becomes very high.
  • In hilly terrains where cost of erection of overhead lines of under ground cable becomes very high.
  • As reinforcement of existing system without increasing voltage.
  • For temporary supplies.
Ipsum

Typical Cross section of 72 Fibre

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.

Cable Construction Details

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.
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.
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.
Core Identification The 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.
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.

Technical Particulars (as Per Is: 14255 - 1995)

Phase Conductor (Aluminium)
As per IS 8130 : 1984		 Street Lighting Conductor (Aluminium)
As per IS 8130 : 1984		 Messenger Conductor Aluminium Alloy
As per IS 398 (Part-4) : 1979
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 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

Composition & Designation Of L.t. Aerial Bunched Cables

Designation Complete Bunched Cable
Approx. Overall Dia mm Approx. Total Mass Kg/Km
3C x 16 mm2 + 25 mm2 + 16 mm2 20 320
3C x 25 mm2 + 25 mm2 + 16 mm2 23 410
3C x 35 mm2 + 25 mm2 + 16 mm2 25 500
3C x 50 mm2 + 35 mm2 + 16 mm2 30 690
3C x 50 mm2 + 35 mm2 + 16 mm2 34 915
3C x 95 mm2 + 70 mm2 + 16 mm2 39 1195
3C x 120 mm2 + 70 mm2 + 16 mm2 44 1485

Note:
We can manufacture Aerial Bunched cable as per customer’s requirement meeting the National/ International specifications