# Current Carrying Capacity of Cables

## Calculate cross-section and conversion factors for cables and wires

Current-carrying capacity: tables

(Extract from VDE 0298 T4 06/13 tables: 11, 17, 18, 21, 26 and 27)

Current-carrying capacity, cables with a nominal voltage up to 1000 V and heat resistant cables VDE 0298 T4 08/03 table 11, column 2 and 5
column 2 column 5
way of laying in air on or at surfaces
mono conductors

– rubber insulated
– PVC insulated
– heat resistant

Multi conductor cables
(except for house or handheld units)
– rubber insulated
– PVC insulated
– heat resistant
Number of charged conductors 1 2 or 3
Nominal section Capacity (Ampere)
0,75 mm2 15A 12A
1,00 mm2 19A 15A
1,50 mm2 24A 18A
2,50 mm2 32A 26A
4,00 mm2 42A 34A
6,00 mm2 54A 44A
10,00 mm2 73A 61A
16,00 mm2 98A 82A
25,00 mm2 129A 108A
35,00 mm2 158A 135A
50,00 mm2 198A 168A
70,00 mm2 245A 207A
95,00 mm2 292A 250A
120,00 mm2 344A 292A
150,00 mm2 391A 335A
185,00 mm2 448A 382A
240,00 mm2 528A 453A
300,00 mm2 608A 523A

Current-carrying capacity of cables for deveating ambient temperatures
VDE 0298 T4 06/13, table 17, column 41)
Ambient temperature Factor
10 °C 1,22
15 °C 1,17
20 °C 1,12
25 °C 1,06
30 °C 1,00
35 °C 0,94
40 °C 0,87
45 °C 0,79
50 °C 0,71
55 °C 0,61
60 °C 0,50
65 °C 0,35

1) for cables with a service temperature of max. 70°C at the conductor

Current-carrying capacity of cables for multi-core cables with a nominal section up to 10 mm2
VDE 0298 T4 06/13 table 26. With installation in the open air.
No. of the loaded cores Factor
5 0,75
7 0,65
10 0,55
14 0,50
19 0,45
24 0,40
40 0,35
61 0,30

Current-carrying capacity of cables for diviating ambient temperatures for heat resistant cables VDE 0298 T4 06/13 table 18, column 3-6
column 3 column 4 column 5 column 6
zulässige Betriebstemperatur
90°C 110°C 135°C 180°C
ambient temperature conversion factors, to apply to the capacity of heat resistant cables in table 11, column 2 and 5
up to 50 °C 1,00 1,00 1,00 1,00
55 °C 0,94 1,00 1,00 1,00
60 °C 0,87 1,00 1,00 1,00
65 °C 0,79 1,00 1,00 1,00
70 °C 0,71 1,00 1,00 1,00
75 °C 0,61 1,00 1,00 1,00
80 °C 0,50 1,00 1,00 1,00
85 °C 0,35 0,91 1,00 1,00
90 °C —– 0,82 1,00 1,00
95 °C —– 0,71 1,00 1,00
100 °C —– 0,58 0,94 1,00
105 °C —– 0,41 0,87 1,00
110 °C —– —– 0,79 1,00
115 °C —– —– 0,71 1,00
120 °C —– —– 0,61 1,00
125 °C —– —– 0,50 1,00
130 °C —– —– 0,35 1,00
135 °C —– —– —– 1,00
140 °C —– —– —– 1,00
145 °C —– —– —– 1,00
150 °C —– —– —– 1,00
155 °C —– —– —– 0,91
160 °C —– —– —– 0,82
165 °C —– —– —– 0,71
170 °C —– —– —– 0,58
175 °C —– —– —– 0,41

Current-carrying capacity of cables for the accumulation on walls, in tubes and conduits, on the floor and at the ceiling VDE 0298 T4 06/13 table 21
No. of multi-core cables

(2 or 3 current-carrying cores)

Factor
1  1,00
2 0,80
3 0,70
4 0,65
5 0,60
6 0,57
7 0,54
8 0,52
9 0,50
10 0,48
12 0,45
14 0,43
16 0,41
18 0,39
20 0,38

The maximum current-carrying capacity acc. to DIN VDE 0891 part 1 point 7 has to be considered for the application of insulated cables in telecommunication systems and data processing units.

Current-carrying capacity of cables for wound up cables VDE 0298 T4 06/13 table 27
1 2 3 4 5 6
no. of layers on one drum 1 2 3 4 5
conversion factors 0,80 0,61 0,49 0,42 0,38

Note: for spiral winding the conversion factor is of 0,80 is valid

Source :https://www.sab-cable.com/cables-wires-harnessing-temperature-measurement/technical-data/cables-and-wires/instructions-for-the-safe-application-of-cables/boundary-conditions/calculate-wire-cross-section-current-carrying-capacity-table.html