Siemens SIMATIC NET Instrucciones de operaciones Pagina 163

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Guidelines for Installing Networked Automation Systems in Buildings
7-15
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Establishing Shield Contact
When contacting the cable shields, please note the following points:
S Secure the braided shield with metal cable clamps.
S The clamps must make good and large-area contact with the shield (see Figure
7-2).
S Contact SIMATIC NET twisted-pair cables only using the braided copper shield
and not the aluminum foil shield. The foil shield is connected to a plastic foil to
increase tearing strength and is therefore non-conductive.
S Contact the shield with the shielding bar directly at the point at which the cable
enters the cabinet.
Figure 7-2 Securing Shielded Cables with Cable Clamps and Ties (schematic representation).
S When removing the sheath of the cable, make sure that the braid shield of the
cables is not damaged.
S To allow good contact between grounding elements, tin-plated or galvanically
stabilized surfaces are ideal. With galvanized surfaces, the necessary contact
should be achieved using suitable screws. Painted surfaces should be avoided
at the contact points.
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