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LT Armoured Power Cable
LT Armoured Power Cables are robust, heavy-duty cables designed for underground power distribution and direct burial applications. Manufactured with power cable conforming to IS:7098 (part-1) 2025, these cables offer an economical and reliable solution for medium to heavy power distribution.
Available in both armoured and unarmoured variants, these cables are manufactured with PVC or XLPE insulation and come in a wide range of core configurations — Single Core, Two Core, Three Core, Three & Half Core, and Four Core — making them suitable for virtually all power distribution scenarios.
Single Core Armoured & Unarmoured (Aluminium)
Two Core Armoured and Unarmoured (Aluminum)
Three Core Armoured and Unarmoured (Aluminum)
Three and Half Core Armoured and Unarmoured (Aluminum)
Four Core Armoured and Unarmoured (Aluminum)
A. Technical Advantages
- 1.Higher current rating, higher short circuit rating approx. 1.2 times that of PVC.
- 2.Thermosetting in nature.
- 3.Higher insulation resistance 1000 times more than PVC cables.
- 4.Higher resistance to moisture.
- 5.Better resistance to surge currents.
- 6.Low dielectric losses.
- 7.Better resistance to chemicals.
- 8.Longer service life.
- 9.Comparatively higher cable operation temperature 90°C and short circuit temperature 250°C
Selection of Cables
Power Cables are generally selected considering the application. However following factors are important for selection of suitable cable construction required to transport electrical energy form one end to the other.
- 1)Maximum operating voltage.
- 2)Fault level.
- 3)Load to be carried.
- 4)Possible overloading duration & magnitude.
- 5)Route length and voltage drop.
- 6)Mode of installation considering installation environment such as ambient & ground temperature as well as chemical & physical properties of soil, Grouping factors, arrangement of Cables during installation
- 7)Flame retardant properties.
All sizes of XLPE cables are designed for standard operating conditions in India and abroad.
The standards adopted are after duly considering the geographical / climactical conditions and general applications of power for utilities, distribution and generation purposes.
The cables are manufactured conforming to Indian & International cables specification for XLPE Insulated cables. Customer specific requirements can also be met.
Application
- The Cables are suitable for use on AC single phase or three phase (earthed or unearthed) systems for rated Voltage up to and including 1100 Volts. These Cables can be used on DC Systems for rated Voltage up to and including 1500 Volts to earth.
Commercial Advantages
- Lower laying cost because of comparatively smaller diameter of cable and higher weight*.
- Lower installation charges as the diameter of cable is comparatively lesser with smaller bending radius, requiring less space requirement for laying cables.
- **One size lower cable can be used as compared to PVC insulated cable.
- *Density of XLPE is lower than PVC
- ** For longer cable length voltage drop shall be considered
Basic assumptions
The current rating given as per before mentioned following assumptions
- Maximum Conductor temperature90°C
- Thermal resistivity of soil1.5k. m/w
- Ground temperature30°C
- Ambient air temperature40°C
- Depth of laying (measured to 750 mm
Complete Specification Data
COMPARISON OF SHORT CIRCUIT RATING FOR 1 SECOND DURATION FOR
* PVC & XLPE Insulated Cables ** with Copper and Aluminium Conductors. (Current in kAmps)
| Nominal Size Sq. mm | PVC Insulated | XLPE Insulated | ||
|---|---|---|---|---|
| Copper | Aluminium | Copper | Aluminium | |
| 1.5 | 0.173 | - | 0.21 | - |
| 2.5 | 0.29 | - | 0.36 | - |
| 4 | 0.46 | 0.3 | 0.57 | 0.38 |
| 6 | 0.69 | 0.46 | 0.86 | 0.57 |
| 10 | 1.15 | 0.76 | 1.43 | 0.95 |
| 16 | 1.84 | 1.22 | 2.29 | 1.51 |
| 25 | 2.88 | 1.9 | 3.58 | 2.36 |
| 35 | 4.03 | 2.66 | 5.01 | 3.31 |
| 50 | 5.75 | 3.8 | 7.16 | 4.73 |
| 70 | 8.05 | 5.32 | 10.02 | 6.62 |
| 95 | 10.93 | 7.22 | 13.59 | 8.98 |
| 120 | 13.8 | 9.12 | 17.17 | 11.34 |
| 150 | 17.25 | 11.4 | 21.47 | 14.18 |
| 185 | 21.27 | 14.06 | 26.47 | 17.48 |
| 240 | 27.6 | 18.24 | 34.34 | 22.68 |
| 300 | 34.5 | 22.8 | 42.93 | 28.35 |
| 400 | 46 | 30.4 | 57.24 | 37.8 |
| 500 | 57.5 | 38 | 71.55 | 47.25 |
| 630 | 72.45 | 47.88 | 90.15 | 59.54 |
| 800 | 92 | 60.8 | 114.48 | 75.6 |
| 1000 | 115 | 76 | 143.1 | 94.5 |
*PVC Type A Insulation as per IS-5831 84.
*PVC Cables as per IS-1554 (Part-1)
*XLPE Cables as per IS-7098 (Part-1)
1) Max. Conductor Temperature during Operation
PVC
XLPE
70°C
90°C
2) Max. Conductor Temperature During Short circuit.
PVC
XLPE
160°C
250°C
Formula relating Short Circuit Rating with duration
Ish =
K × A√t
A
=
Gross section area in Sq. mm
T
=
Duration in seconds
K
=
Constant
Ish
=
Short circuit current, KA
CONDUCTOR TECHNICAL INFORMATION FOR SINGLE CORE AND MULTICORE CABLES CONFORMING TO IS-8130/1984 (STRANDED-CLASS-2) COPPER & ALUMINIUM CONDUCTORS.
| Nominal Size of Conductor | Minimum no. of wires | Max D.C. Resistance at 20°C | A. C. Resistance at 90°C | |||||
|---|---|---|---|---|---|---|---|---|
| Non Compacted | Compacted Round / Shaped | Plain Copper | Aluminium | Plain Copper | Aluminium | |||
| CU. | ALU. | CU. | ALU. | Ohm/Km | Ohm/Km | Ohm/Km | Ohm/Km | |
| Sq.mm | CU. | ALU. | CU. | ALU. | Ohm/Km | Ohm/Km | Ohm/Km | Ohm/Km |
| 1.5* | 3 | 3 | - | - | 12.10 | 18.1 | 15.40 | 23.2 |
| 2.5* | 3 | 3 | - | - | 7.41 | 12.1 | 9.45 | 15.50 |
| 4* | 7 | 3 | - | - | 4.61 | 7.41 | 5.88 | 9.50 |
| 6* | 7 | 3 | - | - | 3.08 | 4.61 | 3.93 | 5.91 |
| 10* | 7 | 7 | 6 | - | 1.83 | 3.08 | 2.33 | 3.95 |
| 16 | 7 | 7 | 6 | 6 | 1.15 | 1.91 | 1.47 | 2.44 |
| 25 | 7 | 7 | 6 | 6 | 0.727 | 1.20 | 0.93 | 1.54 |
| 35 | 7 | 7 | 6 | 6 | 0.524 | 0.868 | 0.668 | 1.11 |
| 50 | 19 | 19 | 6 | 6 | 0.387 | 0.641 | 0.494 | 0.82 |
| 70 | 19 | 19 | 12 | 12 | 0.268 | 0.443 | 0.342 | 0.568 |
| 95 | 19 | 19 | 15 | 15 | 0.193 | 0.32 | 0.247 | 0.410 |
| 120 | 37 | 37 | 18 | 15 | 0.153 | 0.253 | 0.196 | 0.325 |
| 150 | 37 | 37 | 18 | 15 | 0.124 | 0.206 | 0.159 | 0.264 |
| 185 | 37 | 37 | 30 | 30 | 0.0991 | 0.164 | 0.128 | 0.211 |
| 240 | 61 | 37 | 34 | 30 | 0.0754 | 0.125 | 0.0985 | 0.161 |
| 300 | 61 | 61 | 34 | 30 | 0.0601 | 0.100 | 0.0796 | 0.129 |
| 400 | 61 | 61 | 53 | 53 | 0.047 | 0.0778 | 0.0637 | 0.101 |
| 500 | 61 | 61 | 53 | 53 | 0.0366 | 0.0605 | 0.0515 | 0.0786 |
| 630 | 91 | 91 | 53 | 53 | 0.0283 | 0.0469 | 0.0421 | 0.0615 |
| 800 | 91 | 91 | 53 | 53 | 0.0221 | 0.0367 | 0.0354 | 0.0488 |
| 1000 | 91 | 91 | 53 | 53 | 0.0176 | 0.0291 | 0.0225 | 0.0372 |
* These sizes can be manufactured with solid conductor having single strand
Flashcables PRECONDITIONS FOR CURRENT RATING
1
The values given in the table are valid for on circuit in a three phase system under conditions specified. For grouping cables rating factor must be used.
2
The current carrying capacities mentioned in Flashcables technical data are intended as a guide, to assist operating engineers in selecting cables for safety and reliability.
3
Basic assumption and condition of installation:
- Ambient ground Temperature: 30°C
- Ambient air Temperature: 40°C
- Depth of Cable Burial: 750 mm
- Thermal Resistivity of soil: 1.5 k.m/w
4
Single Core Cables are installed as indicated in the table; spacing between cables in flat formation is as indicated.
5
For 3 and 4 core cables, it is usual to assume the same current carrying capacity for 4 core cable as for 3 core cables. Our calculated values are based actually on 3 core cables. These values are suitable with enough accuracy also for 4 cables in most cases. Only for large 4 core cables in air the values are too conservative, due to the large cable surface and consequent high heat dissipation factor.
6
To obtain the maximum current carrying capacity of a cable operating at different conditions from the standard, various rating factors are to be multiplied as follows:
Ia = K Is (in Amperes)Where:
- Ia = Current Rating at actual Operating Conditions (amperes)
- Is = Current Rating at Standard Operating Conditions (amperes)
- K = Rating factor as applicable