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3.7. Power electrical connection
3.7.1. Wires sizes
In every country, you must respect all the local electrical installation
regulations.
Not limiting example in France: NFC 15-100 or CEI 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
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
Sizes for H07 RN-F cable at 40°C
Section
[mm²]
4
6
10
16
25
35
50
70
95
120
150
185
240
300
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o
I
Resistance
max
[A
]
[Ω/Κm]
rms
23
4.250
30
2.833
40
1.700
54
1.063
71
0.680
87
0.486
106
0.340
134
0.243
163
0.179
189
0.142
217
0.113
247
0.092
291
0.071
334
0.057
59 - PVD3627-August 2011
.
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