Siemens SIMOTION D4x5-2 Commissioning And Hardware Installation Manual page 60

Connecting
4.2 Protective conductor connection and potential equalization
The following minimum cross-sections are required according to IEC 60364-5-54:
● For copper, at least 6 mm²
● For aluminum, at least 16 mm²
● For steel, at least 50 mm²
NOTICE
Fault of the data link or device defect with missing equipotential bonding
Considerable leakage currents can flow via the data cable if equipotential bonding is not
provided. Disturbance of the data link or device faults may result.
Install an equipotential bonding conductor together with the data cable.
Due to the maximum length of 100 m for PROFIBUS copper cable at 12 Mbit/s or for
PROFINET copper cable and due to the electrical isolation, EMC protection and equipotential
bonding aspects, it is recommended that fiber-optic cables be used for connections between
buildings.
Additional information
Further information on the protective connection and equipotential bonding can be found in
the following references:
● SINAMICS drive system: See the SINAMICS manuals
● PROFIBUS and PROFINET: See the following Internet address (http://www.profibus.com)
(at Downloads)
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Commissioning and Hardware Installation Manual, 03/2018, A5E33441636B
SIMOTION D4x5-2