5.V. spread fire, explosion, chemical
or radioactive emissions).2 Costs with lightning protection system
In building where lightning protection measures
have been taken, the likelihood damage (lightning
strike the building) occurring smaller.
1.
• The damage structure due lightning strike
can also influence surrounding structures the en-
vironment (e.4 Empirical lightning protection classification of
buildings
One way determining the necessary lightning pro-
tection classes through the use statistical data.5.
1.7.
Note
A precise calculation involving numerous other para-
meters must carried out the form risk ana-
lysis accordance with IEC 62305-2.
Lightning protection measures are always required
when:
• responsible authority demands them. this case,
the required lightning protection class should either
be specified the authority determined through
calculation. In
Germany, the German Insurance Federation publishes
Directive VdS 2010 (risk-oriented lightning and surge
protection) which offers help classifying buildings in
this way. supports
the decision whether and how lightning protec-
tion system erected Germany. the other hand, this needs be
compared with the cost lightning protection sys-
tem, and the reduction damage that would be
achieved installing it.7.g.
• Lightning protection measures are required accord-
ing statutory requirements. The annual
costs are determined multiplying the (now lower)
probability lightning strike with the likely damage
that lightning strike would cause the property, and
the annual costs the lightning protection system. (Table 1.
1.
1.7.7.1 Costs without lightning protection system
In building where lightning protection measures
have been taken, the annual costs are determined by
multiplying the probability lightning strike the
building with the damage that lightning strike is
likely the property.7.
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47
Chapter General introduction
.3 Comparing the costs lightning damage in
buildings with and without lightning protection
system
The cost-effectiveness lightning protection meas-
ures assessed comparing the annual costs for
an unprotected building with the annual costs for a
protected building.TBS
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Application
Lightning protection class
according IEC 62305
Computer centres, military applications, nuclear power stations I
Ex zones industry and the chemicals sector II
Photovoltaic systems III
Museums, schools, hotels with more than beds III
Hospitals, churches, storage facilities, meeting places accommodating more than 100/200 people III
Administrative buildings, sales points, offices and bank buildings over 2,000 III
Residential buildings with more than apartments, multi-storey buildings over high III
Photovoltaics kW) III
Table 1.5 Cost-effectiveness calculation for lightning
protection systems
In buildings where danger posed humans, the
need for lightning protection measures can as-
sessed according purely economic criteria. "Legal and standardised prin-
ciples for lightning protection structures", VDB
(Verband Deutscher Blitzschutzfirmen) e.5)
With its Guide No. the
one hand, necessary consider the likelihood of
a lightning strike and the cost the damage that this
would cause.5.5: Excerpt from Directive VdS 2010: Recommendation property insurers for lightning protection classes
1
