Application Of Hvi ® Power Conductors; Safety Instructions - DEHN + SÖHNE HVI power Montageanleitung

1. Application of HVI
To avoid dangerous flashover between parts of the external lightning protection system and internal in-
stallations such as conductive parts (electrical installation, pipework, etc.), the separation distance "s"
must be observed when installing lightning protection systems.
High impulse voltages cause flashover on the surface of insulating material if no additional measures
are taken. This effect is also referred to as creeping flashover. If the creeping discharge inception voltage
is exceeded, a surface discharge is initiated which can easily flash over a distance of several metres. To
prevent creeping discharges, HVI
discharge high lightning impulse voltages to a reference potential. For functional reasons, a connection
is established between the semiconductive outer sheath and the equipotential bonding system of the
building (no lightning voltage) in the sealing end range. This connection to the functional equipotential
bonding system can made e.g. on earthed metal roof-mounted structures located in the protected zone
of the lightning protection system, earthed parts of the building's structure that do not carry lightning
voltage or the protective conductor of the low-voltage system.
No conductive or earthed parts may be located in the sensitive sealing end range within the
separation distance "s".

2. Safety instructions

HVI power Conductors may only be installed under the conditions shown and referred to in these
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installation instructions.
Only qualified and trained personnel (lightning protection specialists) may install HVI
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ductors. We recommend to visit a special training course on HVI
(http://www.dehn.de/de/dehnacademy).
For safety reasons, installation work must be stopped as soon as a thunderstorm approaches / is
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noticed.
The components of the HVI
ponents of the HVI
4
power Conductors
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power Conductors feature a special outer sheath which allows to
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power system have been tested as a complete system. Mixing com-
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power system with components from other manufacturers is not permitted.
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products held by DEHN + SÖHNE
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power Con-
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