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s in air s in case Length of Cross-section Outer Bending
of solid the seal- of the inner diameter radius
material ing end conductor (Cu)
HVI light Conductor, s ≤ 0.45 m s ≤ 0.9 m ≤ 1.2 m 19 mm 2 Grey 20 mm ≥ 200 mm
DEHNcon-H,
HVI Conductor, s ≤ 0.75 m s ≤ 1.5 m ≤ 1.5 m 19 mm 2 Black 20 mm ≥ 200 mm
HVI long Conductor Grey 23 mm ≥ 230 mm
HVI power Conductor, 2 Black 27 mm ≥ 270 mm
HVI power long Conductor s ≤ 0.90 m s ≤ 1.8 m ≤ 1.8 m 25 mm Grey 30 mm ≥ 300 mm
Table 5.2.4.1 Parameters of a HVI Conductor

HVI light Conductor (s ≤ 0.45 m in air, s ≤ 0.9 m The HVI light Conductor is a system for maintaining the sepa-
in case of solid material) ration distance in case of intermeshed air-termination systems
Irrespective of the hazard of possible lightning strikes, pipe- on flat roofs. The high-voltage-resistant insulation of the HVI
lines, electrical and information technology systems as well as light Conductor prevents uncontrolled flashover e.g. through
PV systems are spread at a large scale across the roof surface. the roofing to metal or electric parts underneath it.
Due to this installation situation and the dimensions of the This system significantly differs from the standard HVI Conduc-
building, it is almost impractical to maintain the separation tor due to the fact that no direct connection (no sealing end)
distance by means of non-insulated conductors. However, to the functional equipotential bonding system of the build-
according to the standard, it is imperative to consistently in- ing must be established. The HVI light Conductor (adjustment
termesh the air-termination system while maintaining the range) is connected at the lower part of the supporting tube by
separation distances. means of metal conductor holders, thus facilitating installation
(Figure 5.2.4.5).
It is equally important that the real conductor lengths of the
HVI light Conductor are used to calculate the separation dis-
tance. In this context, the conductor length at the supporting
tube up to the connecting plate (connection to the air-termina-
tion rod) must also be observed.

DEHNcon-H (s ≤ 0.45 m in air, s ≤ 0.9 m in case of solid
material)
HVI light Conductor HVI long Conductor HVI power Conductor
Particularly in residential and low buildings, it can be problem-
Figure 5.2.4.4 Different types of HVI Conductors atic to install bare, uninsulated conductors due to proximities.
In this case, it is mostly impractical to consistently maintain the
necessary separation distances. In addition to the IEC 62305
(EN 62305) lightning protection standard, the IEC 60728-11
(EN 60728-11) standard, which requires that radio towers
should be separately integrated in the lightning protection
system of buildings, if possible, provides information on sepa-
ration distances. The DEHNcon-H Conductor is ideally suited
for this purpose.

Depending on field of application, two types of DEHNcon-H
Conductors (pre-assembled) are available:
¨ DEHNcon-H, HVI light Conductor I
¨ DEHNcon-H, HVI light Conductor III

Figure 5.2.4.5 Protection of a PV system by means of a HVI light DEHNcon-H, HVI light Conductor I is used if the air-termination
Conductor system is directly connected to the earth-termination sys-

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