11 kv Cable
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     Continuous Current Rating for Single/Three Core Cables
     with Aluminium / Copper Conductor
Aluminium
Copper
Nominal
Cross
Sectional
Area of
Conductor
Continuous Current Rating for Three Core Cable Continuous Current Rating for Single Core Cable
(Single End bonding)
When Laid in
Ground
When Laid in
Air
When Laid in
Ground
When Laid in Air
Sq.mm. amps amps amps amps
35 115 125 115 140
145 165 150 180
50 130 150 140 170
170 195 175 215
70 160 190 170 210
210 240 215 270
95 190 230 200 255
250 295 260 325
120 220 260 230 295
280 335 295 375
150 245 295 255 335
310 380 320 425
185 275 335 290 385
350 430 370 495
240 315 395 330 455
400 500 425 580
300 355 450 375 520
450 570 475 670
400 400 520 425 610
500 650 540 760
500 455 600 485 720
550 740 600 900
630 -- -- 550 830
-- -- 670 1010
800 -- -- 620 950
-- -- 730 1140
1000 -- -- 670 1070
-- -- 790 1250
Ambient Air Temperature: 400 C
Ground temperature : 300 C
Thermal Resistivity of Soil : 1500 C cm/w
Maximum Continuous Conductor temperature : 900 C
Single Core Cable laid in Trefoil  
Three Core Cable laid Singly
Maximum Conductor Temperature
after Short Circuit : 2500 C
Depth of Laying
3.3 kv to 11 kv Above 11 kv
900 mm 1050 mm

Tips:
3.Key Manufacturing Process in HT Cable    Manufacturing.

  • XLPE Screenings and Insulation by Extrusion

    Conductors made through stranding process are subjected to this operation to form cores. The process requires three extrusion operations, which are done simultaneously using three extruders but a common head.

    The core consists of three concentric layers of extruded material. The first is a layer of black semi conducting compound formed over the stranded compacted conductor using the first extruder. Just on top of this a layer of white insulation compound is extruded to form the second layer and finally through another extruder a layer of black semi conducting compound is extruded over insulation layer. The semi conducting layer formed over conductor is called conductor screen and the one over insulation is called insulation screen. The three layers i.e .conductor screen, insulation and insulation screen are formed through a common head known as triple head.

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