29 - PVD 3661 MGV_ commisionning manual_March 2012.docx
Not limiting example in France: NFC 15-100 or IEC 60364 as well in Europe.
Cable selection depends on the cable construction, so refer to the cable technical
documentation to choose wire sizes
Some drives have cable limitations or recommendations; please refer to the drive technical
documentation for any further information.
Cable selection
At standstill, the current must be limited at 80% of the low speed current I
o
and the cable
has to support the peak current for a long period. So, if the motor works at standstill, the
current to select the right wire size is
√
2 x 0.8 Io
≅
1,13 x I
o
.
Sizes for H07 RN-F cable, for a single core in free air at 40°C max
Section
I
max
Resistance
[mm²]
[A
rms
]
[
Ω/Κ
m]
4
23
4.250
6
30
2.833
10
40
1.700
16
54
1.063
25
71
0.680
35
87
0.486
50
106
0.340
70
134
0.243
95
163
0.179
120
189
0.142
150
217
0.113
185
247
0.092
240
291
0.071
300
334
0.057
Conditions of use:
Example of sizes for H07 RN-F cable :
Case of single conductors type H07 RN-F:
60°C maximum
Ambient temperature: 40°C
Cable runs on dedicated cables ways
Current limited to 80%*I
0
at low speed or at motor stall.
Example:
Io=100 Arms
Permanent current at standstill : 80 Arms
Max permanent current in the cable = 113 Arms
Cable section selection = 70mm² for a single core in free air at 40°C max.
You also have to respect the Drive commissioning manual and the cables current densities or voltage
specifications
