3-22
Engineering Guide CDA3000
3 Selection of inverter module
Current load capacity of multi-wire cables dependent on ambient
temperature to VDE 0298 Part 4
For more information on “current load capacity and protection of
cables with PVC insulation” refer to VDE 0100 Part 430 supplement
sheet 1 (11/91).
Protection of the mains power cable
Normal time-lag fuses (see Table 3.16) can be used to protect the mains
power cable.
1
The fuses must be designed in conformance with local safety standards,
the matching mains voltage and the corresponding rated input current of
the inverter.
If standard commercially available miniature circuit-breakers are
used for protection purposes, the tripping characteristic “C” must
be configured.
Insulating material
*)
NR/SR PVC EPR
Permissible operating temperature 60 °C 70 °C 80 °C
Ambient temperature °C Conversion factors
10
15
20
25
30
35
40
45
50
55
60
65
70
1,29
1.22
1.15
1.08
1.00
0.91
0.82
0.71
0.58
0.41
-
-
-
1.22
1.17
1.12
1.06
1.00
0.94
0.87
0.79
0.71
0.61
0.50
-
-
1.18
1.14
1.10
1.05
1.00
0.95
0.89
0.84
0.77
0.71
0.63
0.55
0.45
*) At higher ambient temperatures based on manufacturer's specifications
Table 3.17 Current load capacity of multi-wire cables dependent on ambi-
ent temperature
1. The fuse does not protect the input rectifier bridge of the inverter module, it merely protects the
cable.
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