Connection between the cable shield and the equipotential bonding bar in PROFINET applications

Notes on mechanical and EMC protection of the shield connection

 

The PROFINET installation guidelines point out that PROFINET must be fixed / strain-relieved cables above and below the shield connection. The cable shield must not be used for strain relief. The cable shield is not suitable to absorb mechanical tensile forces. Otherwise it is very likely that the cable shield will be damaged under tensile load. The cable jacket (outer sheath) is suitable for strain relief.

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When establishing the shield connection, please note the following:

  • Remove the PROFINET cable jacket only for the required connection surface. The PROFINET cable is susceptible to mechanical damage in the area where the jacket has been removed.
     
  • Be careful not to damage the shield when stripping off the PROFINET cable jacket.
     
  • Do not use the shield connection as a strain relief location. This would  reduce the contact quality between the shield and the equipotential bonding bar. Exception: installation components specifically designed for this type of application.
     
  • Secure the PROFINET cable above and below the shield connection position. The PROFINET cable can thus be protected against bending. Pay particular attention to strain relief if the cable is exposed to motion.
     
  • Use only connection components that are suitable for the diameter of the stripped cable.
     
  • Do not attach the equipotential bonding bar to coated surfaces. Galvanised or chromed surfaces, for example, are well suited. Use tin-plated, galvanised or otherwise galvanically treated installation material which is protected against corrosion and establishes a permanent high quality contact.

Source: https://www.profibus-profinet.cz/images/Dokumenty/PROFINET/19411_PROFINET_Guideline_Assembly_8072_V10_Jan09.pdf

(see pages 81-82)

No tensile load!

 

icotek EMC shield clamps compliant to the PROFINET installation guidelines:

Cable shield clamps for 35mm DIN rails

EMC shield clamp with double strain relief function for snap-on mounting on 35 mm DIN rail shape H.

SF2Z

Cable shield clamps for 30mm C-rails

EMC shield clamp with double strain relief function for screw mounting on 30 mm DIN rail shape C.

SC|LF2Z

Cable shield clamps for 10 x 3 mm bus bars

EMC shield clamp with double strain relief function for snap-on mounting on 10 x 3 mm bus bars.

PFS2Z

Cable shield clamps for screw mounting

EMC shield clamp with double strain relief function for direct mounting via screws, e.g. on metal sheets.

LF2Z