Power Cables

Power Cables

A power cable is explicitly intended for communicating power. It even gets the job done the reason for dissemination. It involves somewhere around one freely safeguarded electrical transport, commonly held together with an overall sheath. The item is used for transmission and allocation of electrical power.

The power cables upheld by electrical energy may be presented as enduring wiring inside structures, made in the progress, and run vertical or revealed. Versatile power joins are used for helpful devices, compact instruments, and equipment.

These are arranged and delivered by voltage, current to be conveyed, working most outrageous temperature, and justification behind applications needed by the client.

For mining, we give extra mechanical fortitude to control cables with twofold building up. For the clients of wind power cables, overall, require versatile and UV shielded interface with the mechanical outrageous sheath so we plan as indicated by their essential. Our fine items like power cables are dealt with by specialists.

The underground connections partake in a couple of advantages, for instance, these are less committed to hurt through storms, lightning, low help cost, a lower chance of issues, the much unobtrusive voltage drop, and a predominant outward show.

Out of all brands Techno flex Cable has guaranteed a specialty in the electrical transport industry. A wide item portfolio will undoubtedly keep their in front of contenders.

Techno Flex Cables is one of the strongest and quality power cable manufacturer, power cable exporter, power cable supplier in Mumbai, India. We serve this power cable in all over countries. If you want this power cable please quote here !

We offer a comprehensive range of power cables available in plain Annealed copper. These power cables are further insulated with PVC. These wires are fire and heat resistant as well as these wire are insolvent to oil and water. These power cables are available in multi core armoured construction and various sizes.

Techno Flex manufacture high quality heavy duty power cable confirming to IS: 1554 (Part -1) L.T. 1100 volts grade

Construction Details

CONDUCTOR - Plain bright annealed copper / alluminium, solid / stranded conductor confirming to IS: 8130: 1984.

INSULATION - Type A, B, & C (HR) grade according to IS: 5831 : 1984 amended up dated.

INNER SHEATH - Inner sheathing shall done by extrusion or by PVC tape binding that laid up cores shall not loose and prevent to water entering.

ARMOUR - Gl armour wire / strip provides not only mechanical support but also earthing. The material use an according to IS : 3975 : 1974 amended up dated.

OUTER SHEATH - Extruded STI / ST2(HR, FRLS, Halogenfree FRLS) type PVC is used according to IS : 5831: 1984.

APPLICATION - In Thermal Power Station; Petrochemical Refineries; Steel & Cement Plant; Distribution System; Digital Control and Monitoring & Information systems; Air Ports; Building Towers; etc.

Techno Flex manufacture heavy duty Power Cable comprising of cores Single / Two / Three / Three & Half / Four Of Alluminium Conductor, PVC Insulated cores laid up, PVC Inner Sheathed OR PVC tape binding, GI wire / Strip Armoured & overall PVC sheathed cable confirming to IS : 1554 : Part-I.

Basic assumption for Current ratings

  1. Max. Conductor Temp. - 70°C
  2. Thermal resistivity soil - 150°C CM/W
  3. Thermal resistivity of rvc - 650°C CM/W
  4. Ground temperature - 30°C
  5. Amb. air temperature - 40°C
  6. Depth oflaying - 75 cm (highest pt. of cable laid)

Rating Factors


  1. Rating Factor for depth of laying Twin & Multicore Cables

    2. Depth Of laying cm Upto 25mm² Above 25mm² & 300mm² Above & 300mm² Multicore
    70 1 1 1 1
    90 0.99 0.98 0.97 0.99
    105 0.98 0.97 0.96 0.98
    120 0.97 0.96 0.95 0.97
    150 0.96 0.94 0.92 0.96
    180 or More 0.95 0.93 0.91 0.95

  2. Rating Factor for the Single Core Cables (AC) in the formation in Air Applied to the corresponding ratings for trefoil groups in air.
    3. Nominal Area Of Conductor mm² Rating Factor
    Upto & Including 185 1.07
    240 1.10
    300 1.08
    400 1.04
    500 1.00
    600 1.00

  3. Rating Factor for variation in underground temperature for cables laid direct in ground & laid in duct.
    4. Ground Temperature 0°C 15 20 25 30 35 40 45
    Rating Temperature 1.17 1.17 1.17 1.17 1.17 1.17 1.17

  4. Rating Factor for variation in underground temperature for cables laid direct in ground & laid in duct.

    5. Ground Temperature 0°C 15 20 25 30 35 40 45
    Rating Temperature 1.33 1.25 1.16 1.09 1.0 0.90 0.83

Short Circuit Rating Of Alluminium Conductor Cable

Techno Flex cables manufacturing method based on quality assurance plan & use of high standard raw material, therefore it withstand high Magnitude of short circuit rating. It is calculated as under:

where Ish --> short circuit ratings in r.m.s. amp.
t --> duration of short circuit in seconds
A --> Area of conductor in sq.mm

Tabulated The Constant For Different Duration Of Short Circuits :

Duration of Short Circuit in sec. 1 Cycle = 0.02 sec 2 Cycle = 0.04 sec 5 Cycle = 0.1 sec 10 Cycle = 0.2 sec 25 Cycle = 0.5 sec 50 Cycle = 1.0 sec 2 sec 3 sec 4 sec 5 sec
Short Circuit constant Per unit area 536 378 239 169 107 75.7 53.0 43.6 37.8 34

Example: Short Circuit rating of 70 sq.mm area of conductor with short duration 0.5 sec = 70 x 107 = 7490A

Recommendation For Installation :

Cables are the most important asset of any organization. Any damage to it will result in break down of the complete plant & machinery, hence proper attention should be paid while handling and laying them. So for its silent features which should be kept in view during installation as under :

  1. Before laying the installation ofthe cable, It should be checked by meggar as a preliminary check against any probable fault
  2. The drum should be always rolled in the direction of the arrow or opposite to the outside cable end
  3. Avoid the possibility cable twist which will brutally damage the cable because cable have itself twisting force
  4. Properly check the sequence of cores & no crossing of cores while connecting, also decide the direction in which the cable is to be pulled
  5. Possible bending radius should be 12 times the overall diameter of the cable to be maintained. But at any case it should not be less than 8 times
  6. In low temperature area the bending should not be very small radius because PVC compound become stiff & brittle and it shall get crack
  7. All joints terminations armour wires & external metallic bonding should be connected to the earth, wherever possible armour at one end of the cable should be connected to main earth system at the supplying end by employing metallic connectors. Precautions should be taken to eliminate the chemical & by metallic corrosion of the earth connector
  8. The design of the box & composition of the filling compound should provide an effective sealing against entry of moisture to conductor & annour connector
  9. If hot pouring protective compounds are used, the temperature of the compound while pouring should not exceed 150°;C
  10. Where the cables are crossing the roads, the same should be laid in concrete ducts & avoid the sharp edges of concrete ducts in other hand cable may be damaged
  11. We strongly recommend the user that after installation, 2KV DC voltage test should be carried out, through the each core before earthing