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ground surface at intervals of less than 0.25 m x 0.25 m
and must be connected by means of adequate clamps on e.g. mesh < 0.25 m x 0.25 m down conductor
all junctions and down conductors (Figure 9.28.5).

Shelters located in the protected volume of an
isolated air-termination system
Since an air-termination mast (isolated lightning protection
system) installed at a certain safety distance protects the shel-
ter from lightning strikes, potential control must be provided
in the shelter (Figure 9.28.6). Telescopic lightning protection potential control earth rod
masts with screw-in foundation (Part No. 830 208) from DEHN
can be used as air-termination masts. These masts are com-
monly used for existing shelters where the separation distance Figure 9.28.5 Potential control to reduce step voltage
from the rooftop air-termination system and the down conduc-
tor cannot be maintained due to their small size.

Metal shelters
In metal shelters (roof, walls and floor) golfers are not at risk
if they touch the metal construction. An earth-termination protective
system as well as a metal floor or metal grid (potential con- angle
trol) as described before must be installed. Nevertheless,
melting of the roof of the shelter must be prevented, in oth-
er words the roof material must have a minimum thickness
(IEC 62305-3 (EN 62305-3), Table 3, thickness t) to ensure
personal protection. If the metal does not have the required
thickness, air-termination rods must be installed on the metal
roof and must be connected to it in such a way that it can carry
lightning currents. distance
> 2.5 m
Summary
In general, golfers must stay in shelters for about 30 minutes
after they hear the last rumble of thunder. Only then, the thun-
der cell is far enough away.
Shelters on golf courses or hiking trails require both a lightning earth
rod and adequate measures to reduce the risk of inadmissibly potential control rod
high touch and step voltages. As described above, these meas-
ures can be implemented by simple means. Figure 9.28.6 Isolated lightning protection system with telescopic
lightning protection mast
The IEC 62305 (EN 62305) standard series includes funda-
mentals and an overall lightning protection concept. For
more detailed information on lightning protection, please
contact approved lightning protection companies or visit
www.dehn-international.com.

420 LIGHTNING PROTECTION GUIDE www.dehn-international.com