With regard the risk ignition dangerous, po-
tentially explosive atmosphere through lightning
strike, the Technical Rules for Hazardous Substances
No. lightning protection system erected accord-
ing IEC/EN 62305-3, the creation ignitable
sparks, well interfering damaging impacts on
electrical systems through the impact lightning,
need not prevented every case.
This also applies above-ground tanks the open
air and underground tanks with flammable liquids with
an ignition point °C, which are not completely
surrounded earth, masonry, concrete multiples
of these substances.
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Chapter The external lightning protection system
. Therefore, possible posi-
tion air-termination systems zone and zone
22, taking Appendix IEC/EN 62305-3 into ac-
count.8. Ap-
pendix the TRGS lists individual details the
use and requirements spark gaps pipe lines, as
well detailed requirements lightning and surge
protection units according IEC/EN 62305.1127-1 states, lightning strikes potentially ex-
plosive atmosphere, then the atmosphere always ig-
nited.
For this reason, when planning and running lightning
protection system through potentially explosive areas
– so-called zones the following rules must addi-
tionally taken into account:
• IEC/EN 62305-3 Appendix D
"Additional information for lightning protection sys-
tems for structure potentially explosive areas"
• VDE 0185-305-3 Supplement 2
"Additional information for special building struc-
tures"
In systems with zone and zone 22, Ex
atmosphere will most likely only occur rare, unfore-
seen circumstances. The strong heating the arresting paths the
lightning can also trigger ignition. 509 refer TRBS 2152 Part Number 5. Even without
a direct lightning strike, induced voltages can cause
damage electrical devices, systems and compon-
ents for measurement, control and regulation (MCR)
technology and, the worst case, can lead ex-
plosion. Starting the light-
ning strike point, strong currents flow, which can
cause sparks close the impact point. Building
sections containing tanks store flammable liquids
with ignition point and volume more
than 3,000 litres must protected against ignition
risks from lightning strikes using suitable equipment.
For this reason, the three basic principles explo-
sion protection are:
• Avoid potentially explosive atmospheres
• Avoid any possibly effective source ignition
• Limit possible explosion impacts reasonable
level
Special requirements for lighting and surge protec-
tion areas
The lightning protection measures must created in
such way that there are melting and spray im-
pacts
