Chapter G

Sizing and protection of conductors

Recommended simplified approach for cable sizing: Difference between revisions

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In order to facilitate the selection of cables, 2 simplified tables are proposed, for unburied and buried cables.<br>These tables summarize the most commonly used configurations and give easier access to the information.  
In order to facilitate the selection of cables, 2 simplified tables are proposed, for unburied and buried cables.<br>These tables summarize the most commonly used configurations and give easier access to the information.  


== Unburied cables ==
== Unburied cables ==


{{TableStart|Tab1193|5col}}
{{tb-start|id=Tab1193|num=G21|title=Current-carrying capacity in amperes (table C.52.1 of IEC 60364-5-52)|cols=5}}
{| class="wikitable"
|-
|-
! Reference methods  
! Reference methods  
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| '''13'''
| '''13'''
|-
|-
| {{Table_HC1}} colspan="13" | '''Size (mm<sup>2</sup>)'''
| {{tb-HC1}} colspan="13" | '''Size (mm<sup>2</sup>)'''
|-
|-
| {{Table_HC2}} colspan="13" | '''Copper'''
| {{tb-HC2}} colspan="13" | '''Copper'''
|-
|-
| 1.5  
| 1.5  
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| 679
| 679
|-
|-
| {{Table_HC2}} colspan="13" | '''Aluminium'''
| {{tb-HC2}} colspan="13" | '''Aluminium'''
|-
|-
| 2.5  
| 2.5  
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| 470  
| 470  
| 530
| 530
|-
|}
{{TableEnd|Tab1193|G21|Current-carrying capacity in amperes (table C.52.1 of IEC 60364-5-52)}}


Correction factors are given in {{FigureRef|G22}} for groups of several circuits or multi-core cables:
Correction factors are given in {{FigureRef|G22}} for groups of several circuits or multi-core cables:


{{TableStart|Tab1194|4col}}
{{tb-start|id=Tab1194|num=G22|title=Reduction factors for groups of several circuits or of several multi-core cables(table C.52.3 of IEC 60364-5-52)|cols=4}}
{| class="wikitable"
|-
|-
! rowspan="2" | Arrangement  
! rowspan="2" | Arrangement  
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| -  
| -  
| -
| -
|-
|}
{{TableEnd|Tab1194|G22|Reduction factors for groups of several circuits or of several multi-core cables(table C.52.3 of IEC 60364-5-52)}}


== Buried cables ==
== Buried cables ==


{{TableStart|Tab1195|3col}}
{{tb-start|id=Tab1195|num=G23|title=Current-carrying capacity in amperes (table B.52-1 of IEC 60364-5-52)|cols=3}}
{| class="wikitable"
|-
|-
! rowspan="2" | Installation  
! rowspan="2" | Installation  
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|-
|-
| rowspan="17" | '''D1/D2'''
| rowspan="17" | '''D1/D2'''
| {{Table_HC2}} colspan="5" | '''Copper'''
| {{tb-HC2}} colspan="5" | '''Copper'''
|-
|-
| 1.5  
| 1.5  
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|-
|-
| rowspan="16" | '''D1/D2'''
| rowspan="16" | '''D1/D2'''
| {{Table_HC2}} colspan="5" | '''Aluminium'''
| {{tb-HC2}} colspan="5" | '''Aluminium'''
|-
|-
| 2.5  
| 2.5  
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| 364  
| 364  
| 308
| 308
|-
|}
{{TableEnd|Tab1195|G23|Current-carrying capacity in amperes (table B.52-1 of IEC 60364-5-52)}}
 
[[ru:Рекомендуемый упрощенный метод определения сечения кабелей]]
[[zh:对电缆大小分类推荐的简化方法]]

Latest revision as of 09:49, 22 June 2022

In order to facilitate the selection of cables, 2 simplified tables are proposed, for unburied and buried cables.
These tables summarize the most commonly used configurations and give easier access to the information.

Unburied cables

Fig. G21 – Current-carrying capacity in amperes (table C.52.1 of IEC 60364-5-52)
Reference methods Number of loaded conductors and type of insulation
A1 2 PVC 3 PVC 3 XLPE 2 XLPE
A2 3 PVC 2 PVC 3 XLPE 2 XLPE
B1 3 PVC 2 PVC 3 XLPE 2 XLPE
B2 3 PVC 2 PVC 3 XLPE 2 XLPE
C 3 PVC 2 PVC 3 XLPE 2 XLPE
E 3 PVC 2 PVC 3 XLPE 2 XLPE
F 3 PVC 2 PVC 3XLPE 2 XLPE
1 2 3 4 5 6 7 8 9 10 11 12 13
Size (mm2)
Copper
1.5 13 13.5 14.5 15.5 17 18.5 19.5 22 23 24 26 -
2.5 17.5 18 19.5 21 23 25 27 30 31 33 36 -
4 23 24 26 28 31 34 36 40 42 45 49 -
6 29 31 34 36 40 43 46 51 54 58 63 -
10 39 42 46 50 54 60 63 70 75 80 86 -
16 52 56 61 68 73 80 85 94 100 107 115 -
25 68 73 80 89 95 101 110 119 127 135 149 161
35 - - - 110 117 126 137 147 158 169 185 200
50 - - - 134 141 153 167 179 192 207 225 242
70 - - - 171 179 196 213 229 246 268 289 310
95 - - - 207 216 238 258 278 298 328 352 377
120 - - - 239 249 276 299 322 346 382 410 437
150 - - - - 285 318 344 371 395 441 473 504
185 - - - - 324 362 392 424 450 506 542 575
240 - - - - 380 424 461 500 538 599 641 679
Aluminium
2.5 13.5 14 15 16.5 18.5 19.5 21 23 24 26 28 -
4 17.5 18.5 20 22 25 26 28 31 32 35 38 -
6 23 24 26 28 32 33 36 39 42 45 49 -
10 31 32 36 39 44 46 49 54 58 62 67 -
16 41 43 48 53 58 61 66 73 77 84 91 -
25 53 57 63 70 73 78 83 90 97 101 108 121
35 - - - 86 90 96 103 112 120 126 135 150
50 - - - 104 110 117 125 136 146 154 164 184
70 - - - 133 140 150 160 174 187 198 211 237
95 - - - 161 170 183 195 211 227 241 257 289
120 - - - 186 197 212 226 245 263 280 300 337
150 - - - - 226 245 261 283 304 324 346 389
185 - - - - 256 280 298 323 347 371 397 447
240 - - - - 300 330 352 382 409 439 470 530

Correction factors are given in Figure G22 for groups of several circuits or multi-core cables:

Fig. G22 – Reduction factors for groups of several circuits or of several multi-core cables(table C.52.3 of IEC 60364-5-52)
Arrangement Number of circuits or multi-core cables
1 2 3 4 6 9 12 16 20
Embedded or enclosed 1.00 0.80 0.70 0.70 0.55 0.50 0.45 0.40 0.40
Single layer on walls, floors or on unperforated trays 1.00 0.85 0.80 0.75 0.70 0.70 - - -
Single layer fixed directly under a ceiling 0.95 0.80 0.70 0.70 0.65 0.60 - - -
Single layer on perforated horizontal trays or on vertical trays 1.00 0.90 0.80 0.75 0.75 0.70 - - -
Single layer on cable ladder supports or cleats, etc... 1.00 0.85 0.80 0.80 0.80 0.80 - - -

Buried cables

Fig. G23 – Current-carrying capacity in amperes (table B.52-1 of IEC 60364-5-52)
Installation

method

Size mm2
Number of loaded conductors and type of insulation
Two PVC Three PVC Two XLPE Three XLPE
D1/D2 Copper
1.5 22 18 26 22
2.5 29 24 34 29
4 38 31 44 37
6 47 39 56 46
10 63 52 73 61
16 81 67 95 79
25 104 86 121 101
35 125 103 146 122
50 148 122 173 144
70 183 151 213 178
95 216 179 252 211
120 246 203 287 240
150 278 230 324 271
185 312 258 363 304
240 361 297 419 351
300 408 336 474 396
D1/D2 Aluminium
2.5 22 18.5 26 22
4 29 24 34 29
6 36 30 42 36
10 48 40 56 47
16 62 52 73 61
25 80 66 93 78
35 96 80 112 94
50 113 94 132 112
70 140 117 163 138
95 166 138 193 164
120 189 157 220 186
150 213 178 249 210
185 240 200 279 236
240 277 230 322 272
300 313 260 364 308
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