Siemens SINAMICS S120 Manual page 737

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Figure 12-37 Protective connection concept, SINAMICS S120 booksize
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
The protective conductor must be dimensioned in accordance with the local installation rules
for equipment with increased leakage currents. As a minimum, one of the following conditions
must be satisfied:
The protective conductor is routed so that along its complete length it is protected against
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mechanical damage.
The protective conductor has a cross-section ≥ 10 mm
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A second protective conductor with the same cross-section is provided.
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When establishing the connection using an industrial plug connector according to EN
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60309, the protective conductor of a multi-conductor cable must have a cross-section
≥ 2.5 mm Cu.
As a conductor of a multi-conductor cable, the protective conductor has a cross-section ≥
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2.5 mm Cu.
2
The cable cross-section must be dimensioned in compliance with local installation rules.
The cable cross-sections must be dimensioned in compliance with local installation rules.
Additional details are provided in the following document "Dimensioning the protective conduc-
tor for SINAMICS S120 Booksize
(https://support.industry.siemens.com/cs/ww/en/view/109738572)".
Same cross-section as the line conductor of the motor cable.
Cabinet design and EMC Booksize
12.9 Protective connection and equipotential bonding
Cu.
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