Installing Network/Bus Cables Between Buildings - Phoenix Contact Axioline E Series User Manual

Causes of surge voltages
Equipotential bonding line
Surge protective
devices
8395_en_03
4.1.1

Installing network/bus cables between buildings

Surge voltages occur as a result of switching operations, electrostatic disharge, and light-
ning discharge. Surge voltages can be inductively, capacitively or galvanically coupled into
electrical cables for mains supply, measured value transmission, and data transmission. In
this way, surge voltages reach the power supply units and the interfaces of systems and ter-
mination devices.
Install an additional equipotential bonding line between the grounding points of buildings
(3 in Figure 4-1), which is preferably in the form of:
– A metal-reinforced concrete channel
– An additional grounding cable
– A metal pipe
Phoenix Contact recommends wiring all the wires of the cable to surge protective devices
(1 in Figure 4-1) in order to protect the devices against surge voltages.
For information on surge protective devices, please refer to the Phoenix Contact catalogs.
Observe all national and international rulations when installing surge protective
devices.
Figure 4-1 Surge protection measures
1 Surge protective devices
2 Cable shielding
3 Equipotential bonding line
Mounting Axioline E devices and connecting cables
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