Page 7 - DEHN-protects-technical-building-equipment

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External lightning protection / earthing

Lightning protection is protection against fire and, above all, personal injury.

Lightning protection systems form a protective sheath around the building by
intercepting direct lightning strikes and safely discharging them to the ground. 5

Lightning and surge protection measures are essential normative requirements and statutory provisions.
components of the protection concept for modern buil- IEC 62305 deals with external lightning protection and
dings. They form the basis for preventing fire, protecting protects buildings against the effects of a direct lightning 6
people from injury and avoiding damage to vital but strike.
sensitive technology. Protection goals that are also based on 9 8 7
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13 12 More information at:
Components of a lightning protection system 11 de.hn/earthing
A complete lightning protection system (LPS) consists of the
elements shown in the adjacent figure: More information at:
de.hn/expert-pe
External lightning protection: E.g. with HVI system
A lightning protection system consists of an air-termination Lightning protection Part No.
system installed on the roof, which is connected to the Down-conductor system Earth-termination system
earth-termination system via down conductors. To avoid Air-termination Separation distance Lightning equipo- 1 Supporting tube GRP / Al with air-termination tip 105 325
dangerous flashover and thus sparking, separation distances tential bonding
must be kept to conductive metal parts. It is often not system
possible to maintain these separation distances consistently.
Using a high-voltage-resistant insulated down conductor
(HVI Conductor), however, allows you to forget about
separation distances while still safely discharging lightning 2 Tripod, StSt 105 397
currents to the earth-termination system. An HVI system Lightning protection system (LPS) Concrete base, 17 kg 102 012
thus offers optimum safety and maximum flexibility as according to IEC 62305
compared to conventional lightning protection.
3 HVI-long Conductor, black 819 135

Earthing Foundation and/or ring earth electrode 4 Roof conductor holder for HVI Conductors 253 015
Adapter for installing HVI Conductors
253 026
The design and implementation of the earth-termination Combined equipotential bonding systems are a safe and 5 Conductor holder for HVI Conductors 275 250
system are of central importance. After the concrete has set, cost-effective earth-termination system – for as long as the
it is no longer possible to retrofit this vital component, e.g. building stands. Installation of a foundation earth electrode
in the form of a foundation earth electrode. Omissions or in new buildings is required by IEC 61364-5-54 and 6 UNI disconnecting clamp, StSt 459 129
errors during the construction phase cannot be corrected DIN 18015-1 (German standard). The German DIN 18014
later or, at least, not without a great deal of effort and deals with the technical implementation. The foundation Earthing Part No.
expense. earth electrode is installed into the concrete foundations Strip steel 852 335
and covered by at least 5 cm of concrete to ensure corrosion 7 30 x 3.5 mm, galvanised, 25 m long
protection. However, in some cases this conductive earth
connection may no longer be ensured (foundations with 8 Connecting clamp, St/tZn 308 026
increased earth contact resistance) due to various building
construction measures (e.g. when constructing a building Rebar clamp DEHNclip 308 141
made of waterproof concrete). A corrosion-resistant ring 9 Rd 8 mm / Fl 30 x 3-4 mm
earth electrode must then be installed in the ground outside
the building foundations and connected to the functional Water-pressure-tight wall bushing for buildings made of waterproof concrete 478 540
bonding conductor in the foundations. For buildings with 10 Connecting clamps with threaded bolt, light version 478 129
external lightning protection systems, additional connection
lugs must be positioned at intervals corresponding to the 11 Round steel, StSt V4A 860 010
relevant class of LPS in line with IEC 62305 and connected
to the ring earth electrodes. The connection lugs should Cross clamp, StSt V4A 319 209
Combined functional equipotential bonding system protrude at least 1.5 m above ground level. 12
Foundations with increased earth contact resistance, ring earth
electrode with functional bonding conductor according to DIN 18014 13 Anti-corrosion tape 556 125
(German standard) Tape width: 50 mm

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