Current Carrying Capacity

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Current Carrying Capacity
a) Laid in air temperature 30°C load factor (1.0) (protection against direct heat radiation of sunlight)
b) Laid in in duct; ambient temperature 30°C Load factor 1.0
c) Laid in ground; ambient temperature 20°C,
Thermal resistivity of the soil 1 K.M/W load factor 0,7 depth of 2.7 cm
Assembling of single core cables
£&)    3 single core, method of laying triangular shape grouping
OOO 3 single core, side by side laying
Distance between cables
In air: 1x cable diameter
In ground: 7 cm
d) Metal sheath and armour will be earthing from two side of cable
e) Current carrying capacity of Control cable values giving for when all cores under weight
Current Rating in Ampere (A) up to 30°C ambient temperature
Table 1
Cross Section mm2 Group 1 Group 2 Group 3
0.75 _ 12 15
1 11 15 19
1.5 15 18 24
2.5 20 26 32
4 25 34 42
6 33 44 54
10 45 61 73
16 61 82 98
25 83 108 129
35 103 135 158
50 132 168 198
70 165 307 245
95 197 250 292
120 235 292 344
150 - 335 391
185 - 385 448
240 - 453 528
(HOSJ, H07V)
Group 1: One or more single core cables laid induct
Group 2: Multicore cables, flexible cables laid in open or ventilated conduits (NYM, H05W-F)
Group 3: Single core cables laid in open aid with a spacing at least equal to cable diameter (H05V, H07V)

Table 2

1) In air: 20°C ambient temperature at a depth of 70 cm Thermal resistivity of soil 1K.M/W Load Factor: 0.7
2) In ground: 20°C
OOO Installation in side by side clearance between cables in air: 1xd, in ground: 7cm
00   Installation in grouping

System number: 1
Type of Insulation Max Temperature PVC 70 "C XLPE 90 °C
Number of core 1                                   2 3-4*** 1 3-4
Cross Section (mm2) OOO <& 0 0         © OOO <& ©

1.5

2.5

4

6

10

16

25

35

50

70

95

120

150

185

240		 I II I II I II I II I II I II I II
- 25 - 20 32 20 26 18.5 39 32 32 25 30 24
- 34 - 27 42 27 34 25 51 42 43 34 40 32
- 45 - 37 54 37 44 34 66 56 55 44 52 42
- 57 - 48 68 48 56 43 82 71 68 57 64 53
- 78 - 66 90 66 75 60 109 96 90 77 86 73
127 103 107 89 116 89 98 80 139 128 115 102 111 96
163 137 137 118 150 118 128 106 179 173 149 139 143 130
195 169 165 145 181 145 157 131 213 212 178 170 173 160
230 206 195 176 215 176 185 159 251 258 211 208 205 195
282 261 239 224 264 224 228 202 307 328 259 265 252 247
336 321 287 271 317 271 275 244 366 404 310 326 303 305
382 374 326 314 360 314 313 282 416 471 352 381 346 355
428 428 366 361 406 361 353 324 465 541 396 438 390 407
483 494 414 412 458 412 399 371 526 626 449 507 441 469
561 590 481 484 537 484 464 436 610 749 521 606 511 551
 

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