| Conductor
Cross-Section Area |
Reference
Method 4 (enclosed in conduit in thermally insulating wall
etc) |
Reference
Method 3 (enclosed in conduit on a wall or in trucking etc) |
Reference
Method 1 ('clipped direct') |
Reference
Method 11 (on a perforated cable tray horizontal or vertical) |
Reference
Method 12 (free air) |
| |
2
cables, single-
phase ac or dc |
3
or 4 cables three phase ac |
2
cables, single- phase ac or dc |
3
or 4 cables three phase ac |
2
cables, single phase ac or dc |
3
or 4 cables three phase ac |
2
cables, single phase ac or dc flat and touching |
3
cables, three phase ac flat and touching or trafoil |
2
cables, single phase ac or dc or 3 cables three phase ac |
2
cables singles phase ac or dc or 3 cables three phase ac |
3
cables trafoil three phase ac |
Mm
sq
1
1.5
2.5
4
6
10
16
25
35
50
70
95
120
150
185
240
300
400
500
630
800
1000 |
A
11
14.5
19.5
26
34
46
61
80
99
119
151
182
210
240
273
320
367
----
----
----
----
---- |
A
10.5
13.5
18
24
31
42
56
73
89
108
136
164
188
216
245
286
328
----
----
----
----
---- |
A
13.5
17.5
24
32
41
57
76
101
125
151
192
232
269
300
341
400
458
546
626
720
----
---- |
A
12
15.5
21
28
36
50
68
89
110
154
171
207
239
262
296
346
394
467
533
611
----
---- |
A
15.5
20
27
37
47
65
87
114
141
182
234
284
330
381
436
515
594
694
792
904
1030
1154 |
A
14
18
25
33
43
59
79
104
129
167
214
261
303
349
400
472
545
634
723
826
943
1058 |
A
----
----
----
----
----
----
----
126
156
191
246
300
349
404
463
549
635
732
835
953
1086
1216 |
A
----
----
----
----
----
----
----
112
141
172
223
273
318
369
424
504
584
679
778
892
1020
1149 |
A
----
----
----
----
----
----
----
146
181
219
281
241
396
456
521
615
709
852
982
1138
1265
1420 |
A
----
----
----
----
----
----
----
130
162
197
254
311
362
419
480
569
659
795
920
1070
1188
1337 |
A
----
----
----
----
----
----
----
110
137
167
216
264
308
356
409
485
561
656
749
855
971
1079 |
