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Figure 5.1.2.4 Building with photovoltaic system and sufficient Figure 5.1.2.5 Antenna with air-termination rod and spacer
separation distance; source: Blitzschutz Wettingfeld,
Krefeld
Air-termination rods for chimneys must be installed to ensure termination systems are used and the air-termination rods are
that the entire chimney is located in the protected volume. The installed by means of spacers. The metal pipe must be con-
protective angle method is used to dimension the air-termina- nected to the equipotential bonding system.
tion rods.
If the chimney is brick-built or constructed with preformed sec- The assembly to protect parabolic antennas is similar to that to
tions, the air-termination rod can be directly mounted on the protect chimneys with a metal pipe.
chimney.
If there is a metal pipe in the interior of the chimney, e.g. if In the event of a direct lightning strike to antennas, partial
an old building is renovated, the separation distance to this lightning currents can enter the building to be protected via
conductive part must be maintained. To this end, isolated air- the shields of the coaxial cables and cause the interference

Roof conductor holder expansion piece Bridging braid
of type FB2 Part. No. 377 015
Part. No. 253 050
flexible connection

distance between the
roof conductor holders
of approx. 1 m

Roof conductor holder
of type FB
Part. No. 253 015

Figure 5.1.3.1 Air-termination system on a flat roof

74 LIGHTNING PROTECTION GUIDE www.dehn-international.com