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6. Additional connection of the external cable sheath for equipotential bonding
Behind the sealing unit, the HVI conductor can be connected with earthed, no lightning
current carrying parts of the structure (Figs. 1 and 9) . This is an additional equipotential
bonding measure.
This measure is recommended for crossings or parallel conductors to earthed metal
installations such as cable racks or conduits.
Connections can be performed with the EB terminal, Part No. 405 020. This EB connection
does not have to be capable of carrying lightning currents. The cross section of the conductor
must be
4 mm
2
Cu.
The grey sheath of HVI conductor Part No. 819 023 and 819 024 has to be shortened
additionally by 30 mm (Fig. 8) in order to contact the black semi-conductive sheath below.
The black sheath must not be damaged.
EB terminal
Part No. 405 020
Fig. 9
Connection of equipotential bonding
7. Use of HVI conductor III with the "isolated ring conductor"
For several installation parts to be protected, it is recommendable not to lead the HVI
conductor individually from each air termination to the earth-termination system. The individual
HVI conductors coming from the air-termination system can be connected with an "isolated
ring conductor". From the "isolated ring conductor", several down conductors can be led
to the earth-termination system. This leads to a reduction of the coefficient of current
distribution k
from the height of the "isolated ring conductor". This reduces the separation
c
distance s. HVI Conductor III has been provided for this kind of application.
No conductive or earthed components, e.g. conductor holders, parts of the construction,
etc. (Figs. 3 and 4) , must be arranged within the range of the bilateral sealing units.
The "isolated ring conductor" has to be installed, e.g. on the roof level, on distance holders,
e.g. Part No. 106 160, and concrete bases for fixing the distance holder, Part No. 102 010,
under consideration of the calculated separation distance s.
tightening torque 5 Nm
25
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