Current-carrying capacity PVC-insulated LV cables

according to HD 603 S1, part 3G and HD 627 S1, part 4H

General
This section applies to the current-carrying capacity under both standard and deviating provisions provided that the
cables are in three-phase operation with three conductors loaded or one single-core cable in d.c.-operation.
The rated current-carrying capacity are valid under standard provisions.

Basic provisions

Temperatures °C
Maximum permissible operating temperature +70
Maximum short-circuit temperature
for cross sections area ≤300 mm²
for cross sections area >300 mm²
+160
+140

Concentric conductors bonded at both ends.

Power frequency 50 Hz.

The tabulated rated current-carrying capacities are based on standard provisions such as:
– operating mode
– laying conditions
– environmental conditions

For deviating operating conditions the current-carrying capacities in the tables are to be multiplied by appropriate conversion factors which shall be based on the same calculation method and operating conditions as used for the current-carrying capacity given in this clause.

Current-carrying capacity PVC-insulated LV cables

Cables in earth (20°C)

Recommended values according to HD 603 S1, part 5G, table 14

NYY
NY2Y
NYCY / NYCWY
NYC2Y / NYCW2Y
NAYY
NAY2Y
NAYCY / NAYCWY
NAYC2Y / NAYCW2Y
*) *)
Number of
loaded
conductors
3 3 1 3 3 3 3 1 3 3
Cross-sectional
area in mm²
Copper conductor
Rated current in A
Aluminium conductor
Rated current in A
1,5
2,5
4
6
10
16
25
35
50
70
95
120
150
185
240
300
400
500
630
800
1000
30
39
50
62
83
107
138
164
195
238
286
325
365
413
479
541
614
693
777
859
936
27
36
47
59
79
102
133
159
188
232
280
318
359
406
473
535
613
687


41
55
71
90
124
160
208
250
296
365
438
501
563
639
746
848
975
1125
1304
1507
1715
31
40
51
63
84
108
139
166
196
238
281
315
347
385
432
473
521
574
636

27
36
47
59
79
102
133
160
190
234
280
319
357
402
463
518
579
624








106
127
151
185
222
253
284
322
375
425
487
558
635
716
796






102
123
144
179
215
245
275
313
364
419
484
553








160
193
230
283
340
389
436
496
578
656
756
873
1011
1166
1332






108
129
153
187
223
252
280
314
358
397
441
489
539







103
123
145
180
216
246
276
313
362
415
474
528


*) Rated current for cables in d.c. systems with return conductor far away.

Current-carrying capacity PVC-insulated LV cables

Cables in air (30°C)

Recommended values according to HD 603 S1, part 5G, table 15

NYY
NY2Y
NYCY / NYCWY
NYC2Y / NYCW2Y
NAYY
NAY2Y
NAYCY / NAYCWY
NAYC2Y / NAYCW2Y
*) *)
Number of
loaded
conductors
3 3 1 3 3 3 3 1 3 3
Cross-sectional
area in mm²
Copper conductor
Rated current in A
Aluminium conductor
Rated current in A
1,5
2,5
4
6
10
16
25
35
50
70
95
120
150
185
240
300
400
500
630
800
1000
21
28
37
47
64
84
114
139
169
213
264
307
352
406
483
557
646
747
858
971
1078
19,5
25
34
43
59
79
106
129
157
199
246
285
326
374
445
511
597
669


27
35
47
59
81
107
144
176
214
270
334
389
446
516
618
717
843
994
1180
1396
1620
22
29
39
49
67
89
119
146
177
221
270
310
250
399
462
519
583
657
744

19,5
26
34
44
60
80
108
132
160
202
249
289
329
377
443
504
577
626








87
107
131
166
205
239
273
317
378
437
513
600
701
809
916






82
100
119
152
186
216
246
285
338
400
472
539








110
135
166
210
259
302
345
401
479
555
653
772
915
1080
1258






91
112
137
173
212
247
280
321
374
426
488
556
628







83
101
121
155
189
220
149
287
339
401
468
524


*) Rated current for cables in d.c. systems with return conductor far away.

Current-carrying capacity PVC-insulated LV cables

Permissible short-circuit temperatures and rated short-time current densities

Recommended values according to HD 603 S1, part 5G, table 17

Cables with Permissible shortcircuit
temperature
in °C
Rated short-time current density in A/mm²
for a rated short-circuit duration of 1 s
Conductor temperature at the beginning of short-circuit in °C
70 60 50 40 30 20
Copper conductors
≤ 300 mm² 160 115 122 129 139 143 150
> 300 mm² 140 103 111 118 126 133 140
Aluminium conductors
≤ 300 mm² 160 76 81 85 90 95 99
> 300 mm² 140 68 73 78 83 88 93

Current-carrying capacity multicore cables

Group rating factors for multicore cables with different number of loaded cores

Bei drei belasteten Adern gilt
HD 603, Teil 3, Hauptabschnitt G, Abschnitt V (Strombelastbarkeit) und Abschnitt VI (Anhang), Tabelle 14 und Tabelle 15 (Belastbarkeit, Kabel in Erde / in Luft), in beiden Tabellen Spalte 3 und Spalte 5 für Kabel mit PVC-Isolierung
und
HD 603, Teil 5, Hauptabschnitt G, Abschnitt V (Strombelastbarkeit) und Abschnitt VI (Anhang), Tabelle 14 und Tabelle 15 (Belastbarkeit, Kabel in Erde / in Luft), in beiden Tabellen Spalte 3 und Spalte 5 für Kabel mit VPE-Isolierung.
Group rating factors  for multicore cables with different number of loaded cores
according to
HD 627 S1, part 4H, table A.1

Number of loaded cores

Cables in earth

Cables in air

5
7
10
14
19
24
40
61
0,70
0,60
0,50
0,45
0,40
0,35
0,30
0,25
0,75
0,65
0,55
0,50
0,45
0,40
0,35
0,30