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Figure 9.3.6 Fermenter made of bolted metal sheets Figure 9.3.7 Protection of a fermenter made of metal sheets
by means of an isolated air-termination system
(source: Büro für Technik, Hösbach)

termination system from the equipotential bonding level
(earth-termination system) to the air-termination tip is
19 m (in case of class of LPS II). The maximum free length
above the top edge of the fermenter is also 8.5 m.
Note: The two HVI Conductors must be installed in parallel at
intervals of more than 20 cm.
More detailed information on HVI Conductors and
the relevant installation instructions can be found at
www.dehn-international.com.

Design service
Isolated air-termination systems are complex and comprehen-
sive systems. DEHN will be pleased to assist you in designing
isolated air-termination systems based on HVI Conductors,
the DEHNiso Combi system or steel telescopic lightning pro-
tection masts. This design service is available for a fee and
comprises:
¨ Drawings of the lightning protection system (general lay-
out drawings)
¨ Detailed drawings for the isolated air-termination system
(in some cases in the form of exploded views)
¨ Comprehensive parts list of the components required for
the isolated air-termination system
¨ Quotation based on this parts list.
If you are interested in our design service, please contact your
local sales representative or our head office in Neumarkt, Figure 9.3.8 Welded steel container (source: Eisenbau Heilbronn
Germany at www.dehn-international. com. GmbH)

278 LIGHTNING PROTECTION GUIDE www.dehn-international.com