Current Rating of XLPE & PVC Insulated 1100 Volts grade Underground Cables

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The XLPE (Cross Linked Poly Ethylene ) insulated heavy duty cables were introduced worldwide in mid sixties. These cables have overcome the limitations of PVC Insulated Cables such as thermal degradation, poor moisture resistant and thermoplastic in nature.

What is current carrying capacity of a cable?

The current rating of any cable is defined as the maximum current carrying capacity of the power cable under normal operating conditions of temperature, pressure and moisture. It fixes the upper limit of current carrying capacity of the power cable above which the cable will get damaged due to excessive heat.

The current carrying capacity mostly depends on the insulation temperature and electrical resistance of the conductor. The cable rating is classified under three headings. These are Normal maximum continuous current rating, Over-current rating, Short- Circuit rating.

We have summarized the current carrying capacity of single and multi core XLPE Aluminium and Copper cables for easy calculation of voltage drop in power cables while determining the correct cable size for your project.

CURRENT RATING (IN GROUND) FOR XLPE & PVC INSULATED CABLE 1100 VOLT / 1.1 KV GRADE
Nominal area of conductor Sqmm Aluminum conductor Copper conductor
Single core Multicore Single core Multicore
PVC XLPE PVC XLPE PVC XLPE PVC XLPE
10 51 55 46 50 65 71 60 65
16 66 74 60 68 85 95 77 87
25 86 98 76 90 110 125 99 115
35 100 118 92 108 130 150 120 138
50 120 137 110 126 155 175 145 161
70 140 172 135 158 190 220 175 202
95 175 204 165 187 220 260 210 239
120 195 234 185 215 250 301 240 276
150 220 262 210 240 280 336 270 308
185 240 298 235 273 305 381 300 350
240 270 344 275 316 345 441 345 405
300 295 387 305 355 375 496 385 455
400 325 458 335 420 400 586 425 538
500 345 495 425 635
630 390 555 470 710
800 440 625
1000 490 685

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