Power Cable current carrying capacity
The carrying capacity of the wire & cable is related to the conductor cross section, the wire material, the model, the laying method and the environment temperature. The carrying capacity of a variety of wires is usually obtained from the manual.
 
Cable is used to transport electrical energy, and the calculation of the power:
KW=1.732*U*I*COSφ
Formula: kW-- electric power, unit kW
U-- voltage, unit kV
I-- current, unit A
COSφ -- system natural power factor
 
To transport power, the line will have current flow, the greater the current through the line, the more power transmission. Carrying capacity refers to the current amount of transmission line conductor. Specific specifications of each wire allowing the maximum load flow, the state regulations have provisions.
 
Copper/aluminium conductor unarmored or armoured cable carrying capacity:
 
Conductor Conductor cross section Unarmored cable Armoured cable
single core 3 core single core 3 core
in the air in the soil in the air in the soil in the air in the soil in the air in the soil
Copper conductor 1.5 30 43 21 25 - - - -
2.5 40 57 28 33 - - 28 33
4 53 74 37 44 - - 37 43
6 67 94 46 54 - - 47 54
10 93 127 63 73 105 125 63 71
16 124 165 84 94 136 162 84 92
25 168 213 109 120 180 210 110 118
35 207 256 132 144 220 253 134 141
50 252 304 159 169 265 299 161 167
70 308 372 195 205 322 366 197 203
95 384 449 237 245 398 442 239 242
120 439 512 273 278 465 505 275 274
150 507 575 310 309 521 567 314 305
185 591 650 355 347 604 639 354 341
240 694 757 416 399 706 744 414 392
300 810 855 473 446 819 842 - -
400 937 976 - - 949 962 - -
500 1078 1110 - - 1094 1094 - -
Aluminum conductor 10 71 97 48 56 81 96 49 55
16 121 162 82 92 133 159 82 90
25 130 165 85 93 140 163 85 92
35 160 199 102 111 170 196 104 110
50 195 235 123 131 205 272 124 129
70 239 289 152 159 250 284 153 158
95 298 348 184 190 208 343 185 188
120 340 398 213 216 361 392 214 213
150 392 445 241 240 404 439 242 237
185 459 505 277 271 469 497 277 267
240 539 589 326 312 549 578 325 308
300 629 664 272 351 636 654 - -
400 731 762 - - 741 751 - -
500 845 870 - - 858 858 - -


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