8 Guidelines for electrical installation
8.1 General notes
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XI/ON: XNE-GWBR-2ETH-IP
09/2011 MN05002007Z-EN
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Cable routing outside buildings
Outside of buildings, cables should be routed in closed (where possible), cage-type cable
ducts made of metal. The cable duct joints must be electrically connected and the cable ducts
must be earthed.
8.1.3
Lightning protection
The cables must be routed in double-grounded metal piping or in reinforced concrete cable
ducts.
Signal cables must be protected against overvoltage by varistors or inert-gas filled overvoltage
arrestors. Varistors and overvoltage arrestors must be installed at the point where the cables
enter the building.
8.1.4
Transmission media
For a communication via Ethernet, different transmission media can be used:
• coaxial cable
10Base2 (thin koax),
10Base5 (thick koax, yellow cable)
• optical fibre (10BaseF)
• twisted two-wire cable (10BaseT) with shielding (STP) or without shielding (UTP).
Warning
Observe all valid guidelines concerning internal and external lightning protection and
grounding specifications when routing cables outside of buildings.
