System instructions OBO isCon
®
EN | 25
Planning an installation
4 4
Installation in potentially explosive areas
The isCon
®
ProPlus conductor is ignition-free and can thus be used in
lightning protection systems, which are to be located in potentially explo-
sive areas. Here, the isCon
®
ProPlus conductor may be run through the
areas of Ex zone 1/2 and 21/22.
If necessary, an appropriate DEKRA test report can be obtained from
your OBO contact.
Note!
The system operator must divide a structure into Ex zones (see IEC
60079-10-1 and 2).
When planning and running a lightning protection system through Ex
zones, the following rules in particular must be taken into account:
• DIN EN 62305-3 – Appendix D – "Additional information for lightning
protection systems for structures in areas with the risk of explosion"
• VDE 0185-305-3 – Supplementary Sheet 2 – "Additional information
for special structures"
According to this, planners, craftspeople and testers of lightning protec-
tion systems must meet the following requirements and levels of know-
ledge in potentially explosive areas:
• General principles of explosion protection
• General principles of protection ratings and device labelling
• Technical rules for operational safety (TRBS 2152)
• Testing, maintenance and repair requirements and knowledge of the
appropriate technologies and devices
• Meaning of work permission systems and safe electrical separation in
potentially explosive areas of explosion protection
For Ex systems with Ex zone 2 and 22, Supplementary Sheet 2 (VDE
0185-305-3, Point 4.3) states that a potentially explosive atmosphere will
only occur in rare, unforeseen circumstances. Therefore, it is possible to
position air-termination units in Ex zones 2 and 22, taking Appendix D in
DIN EN 62305-3 (VDE 0185-305-3) into account.
In the case of installations in potentially explosive areas, you must con-
nect the isCon
®
ProPlus conductor beyond the potential connection to the
equipotential bonding at regular intervals. See “„5.6.5 Creating additional
equipotential bonding for isCon® ProPlus in potentially explosive areas“
on page 56 for more information.
