Installing LAN Cables
C-17
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
C.5.4 Cabling outside Buildings
Fiber-optic cables should be given preference
For communications between buildings and between buildings and external
facilities, the use of fiber-optic cables is generally recommended. Due to the optical
transmission principle, fiber-optic cables are not affected by electromagnetic
interference. Measures for equipotential bonding for overvoltage protection are
unnecessary with fiber-optic cables.
EMC Rules for Electrical LAN Cables
When installing electrical LAN cables outside buildings, the same EMC rules apply
as to cables inside buildings. The following additional rules apply:
S install cables on metal cable racks
S Electrically connect the cable racks where they join
S Ground the cable racks.
S There must be adequate potential equalization between buildings and external
facilities regardless of the LAN cables. (see section C.4.4 in this manual)
S The cables should be installed as close as possible and parallel to the
equipotential bonding..
S Connect the shields of the cables to the grounding network as close as possible
to the point of entry into the building or facility.
S Electrical LAN cables installed outside buildings must be included in the
lightening protection and grounding concept of the entire system. Please note
the information in Appendix B of this manual.
S All SIMATIC NET PROFIBUS cables can be used if they are installed in cable
channels protected against dampness. In this case, the clearances specified in
section C.5.1 of this manual must be adhered to.
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