Page 3 - dehn-catalogue-lightning-protection_3

Wind Load in Case of Isolated Air-Termination Systems According to Eurocode New Products +

As a result of global warming, extreme weather conditions are beco- The combination of the different parameters results in the gust wind Accessories for mounting bracket for metal roofs 105 241 105
ming increasingly common on a worldwide scale. Consequences such speed to be used as a basis for dimensioning air-termination systems
as high wind speeds, an increased number of storms and heavy rain- and other installations such as elevated ring conductors. In our cata- • C-shaped mounting rails with holes and hanger bolts for wood
fall cannot be ignored. Therefore, designers and installers face new logue, the maximum gust wind speed is specified for our products to and metal for fixing mounting bracket Part No. 105 241 to, e.g.
corrugated sheet roofs.
challenges particularly with regard to wind loads. This not only affects make it possible to determine the required number of concrete bases
building structures (statics of the structure), but also air-termination depending on the gust wind speed, for example, in case of isolated
systems. air-termination systems. Besides allowing the determination of the
static stability, this also makes it possible to reduce the necessary
In the past, the DIN 1055-4:2005-03 and DIN 4131 standards formed weight and thus the roof load.
the basis for dimensioning in the field of lightning protection. In July
2012, these standards were replaced by the Eurocodes which provide Important note: HVI light Conductor (500 m on reel) 144
Europe-wide standardised structural design rules (planning of struc- The “maximum gust wind speeds” specified in this catalogue for the
tures). individual components were determined according to the Germa- • 500 m HVI light Conductor supplied on a disposable plywood
ny-specific calculation requirements of Eurocode 1 (DIN EN 1991-1-4/ reel. Total weight of approx. 290 kg. Empty weight approx. 35 kg,
The DIN 1055-4:2005-03 standard was integrated in Eurocode 1 (EN NA:2010-12) which are based on the wind zone map for Germany and drum width approx. 670 mm, flange diameter 1000 mm.
1991-1-4: Actions on structures – Part 1-4: General actions - Wind the associated country-specific topographic particularities.
actions) and DIN V 4131:2008-09 in Eurocode 3 (EN 1993-3-1: Part When using products from this catalogue in other countries, the coun-
3-1: Towers, masts and chimneys – Towers and masts). Thus, these two try-specific particularities and other locally applicable calculation me-
standards form the basis for dimensioning air-termination systems for thods, if any, described in Eurocode 1 (EN 1991-1-4) or in other locally
lightning protection systems, whereby Eurocode 1 is of primary rele- applicable calculation regulations (outside Europe) must be observed.
vance. Consequently, the maximum gust wind speeds mentioned in this cata-
logue only apply to Germany and only serve as a rough orientation for
The following parameters are used to calculate the actual wind load other countries. The gust wind speeds have to be recalculated accor- Hammer inserts for tubular earth rods 252
to be expected: ding to the country-specific calculation methods! • Hammer inserts for tubular earth rods Ø25 mm and Ø27 mm
• Wind zone (Germany is divided into four wind zones with diffe- with fitting hexagonal wrench size 28 mm and TE-S (hexagonal
rent base wind speeds) wrench size 22 mm).
• Terrain category (the terrain categories define the surroundings of
a structure)
• Height of the object above ground level
• Height of the location (above sea level)

Other influencing factors such as:
• Icing
• Position on a ridge or top of a hill
• Object height above 300 m
• Terrain height above 800 m (sea level)
have to be considered for the specific installation environment and
calculated separately.