retro-cable
Sanketh T pcreate LT xlpe cable calculation all with resistance ,derating factor, temperature ,voltage drop etc. i want all in automatic only selecting sq mm cable size check the resistance and reactance value from polycab CatLog and also include derating factor as per CatLog
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LT XLPE Cable Parameter Calc
Automated resistance, reactance, voltage drop & derating factor calculations for LT XLPE cables — powered by Polycab catalog data.
Select Cable Size
Choose the conductor cross-section in sq mm. Resistance and reactance values are automatically fetched from the Polycab LT XLPE catalog.
>Values sourced from Polycab LT XLPE armoured cable datasheet. Select size to begin calculation.
Cable Installation Parameters
Enter the installation details to calculate resistance, voltage drop, and derating factors for your LT XLPE cable.
// Calculation Output //
Input Parameters
Live Calculation Results
Calculation Results
8 Records| Cable Size | Resistance (Ω/km) | Reactance (Ω/km) | Voltage Drop (V) | VD % | Derating Factor | Temp (°C) | Current (A) | Length (m) | Status |
|---|---|---|---|---|---|---|---|---|---|
| 16 sq mm | 1.150 | 0.0840 | 8.72 | 3.97 | 0.87 | 75 | 82 | 120 | Pass |
| 25 sq mm | 0.7270 | 0.0810 | 5.51 | 2.51 | 0.87 | 75 | 106 | 120 | Pass |
| 35 sq mm | 0.5240 | 0.0790 | 3.98 | 1.81 | 0.85 | 75 | 131 | 120 | Pass |
| 50 sq mm | 0.3870 | 0.0780 | 2.93 | 1.33 | 0.85 | 75 | 154 | 120 | Pass |
| 70 sq mm | 0.2680 | 0.0760 | 2.03 | 0.92 | 0.83 | 75 | 192 | 120 | Pass |
| 95 sq mm | 0.1930 | 0.0750 | 6.31 | 5.87 | 0.80 | 90 | 230 | 380 | Fail |
| 120 sq mm | 0.1530 | 0.0740 | 4.98 | 4.53 | 0.80 | 90 | 262 | 380 | Warn |
| 150 sq mm | 0.1240 | 0.0730 | 4.01 | 3.64 | 0.78 | 90 | 296 | 380 | Pass |
| Summary | Min: 0.124 | Max: 0.084 | Avg VD: 3.81% | Max: 5.87% | Range: 0.78–0.87 | Max: 90°C | Max: 296 A | Max: 380 m | 6 Pass / 1 Warn / 1 Fail | |
> Scenario Comparison 2 / 6
Compare LT XLPE cable sizes and parameters side-by-side. Differences highlighted in gold.
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Download or share your LT XLPE cable calculation report
Quick Reference
Formulas & definitions for LT XLPE cable parameters
DC resistance of a cable conductor per unit length, dependent on conductor material, cross-sectional area, and operating temperature. LT XLPE cables use stranded aluminium or copper conductors; values are sourced from the Polycab catalog.
R_20 = resistance at 20°C (Ω/km) | α = temperature coefficient | T = operating temperature (°C)
AC inductive reactance of the cable, arising from the magnetic field generated by current flow. Depends on conductor spacing, cable geometry, and frequency (50 Hz standard in India). Values are fetched directly from the Polycab LT XLPE data tables.
f = system frequency (50 Hz) | L = inductance per unit length (H/km)
A multiplier (0 < DF ≤ 1.0) applied to the cable's rated current capacity to account for elevated ambient temperature, grouping of cables in trenches or conduits, and burial depth. Combined derating ensures safe continuous operation without insulation degradation.
DF_temp = temperature derating | DF_group = grouping factor | DF_depth = burial depth factor
The reduction in voltage along the cable length due to conductor impedance. For LT systems, IS 732 recommends a maximum of 5% voltage drop from the supply point to the farthest load. Excessive drop causes motor overheating, reduced equipment efficiency, and nuisance tripping.
I = load current (A) | L = cable length (m) | R = resistance (Ω/km) | X = reactance (Ω/km) | cosφ = power factor
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