Siemens 6GK1 901-1GB01 System Manual page 86

Installing network components in cabinets
3.3 Guidelines for setting up networked automation systems in buildings
Measures for grounding and equipotential bonding
According to EN 50310 /21/, a "common bonding network CBN" with a fine mesh of
conductive elements must be created in buildings with information technology systems.
Systems that extend beyond one floor and that are interconnected by electrical bus cables
require a threedimensional CBN with a lattice construction resembling a Faraday cage.
With the following measures, you can create a grounding and bonding system that will
improve EMC:
● Include all the metal parts of a building in a common bonding network (CBN) with low
● Connect all inactive metal parts in the immediate vicinity of your automation components
● Include metal, conductive cable channels/racks in the equipotential bonding of the
● The effectiveness of equipotential bonding is greater when the impedance of the bonding
● The impedance of the additional bonding conductor must not exceed 10% of the shield
● Protect the bonding conductor from corrosion.
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impedance and high current carrying capacity. To this network, you should then connect
the main grounding terminal or bar, grounding conductors, metal conduits, reinforcing
rods, equipotential bonding ring conductor, cable racks and any additional bonding
conductors.
and bus cables to the bonding system ensuring good conductivity. This includes all metal
parts of cabinets, machine parts etc. that have no electrical function in the automation
system.
building and between the individual parts of the system. The individual segments of the
channels/racks must be connected together with low inductance and low resistance and
connected to the CBN system as often as possible. Expansion joints and angled
connections should be bridged by additional flexible grounding bands. The connections
between the individual segments of channels must be protected from corrosion to ensure
longterm stability.
conductor is low.
impedance of parallel Industrial Twisted Pair cables.
Passive network components
System Manual, 02/2013, C79000-G8976-C282-01