To avoid arcing insulating pieces areas, the
use Ex-certified spark gaps required.
Spark gap ISG H
The OBO ISG spark gap certified according to
the following directives for Zone 1/21 and 2/22:
• ATEX
• IECEx
TBS
Blitzschutz-Leitfaden
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Chapter The external lightning protection system
. The spark gaps must have re-
sponse surge voltage 50% the testing voltage
of the insulating elements, although with maximum
of 2.
The ATEX-certified OBO ISG spark gap insulates
the parts the system against corrosion currents, ful-
filling the requirements for the connection lightning
currents potentially explosive areas according to
IEC/EN 62561-3.Spark gap mounted insulating sections
Ex spark gaps ISG H
According TRGS 507, electrical separating ele-
ments potentially explosive areas must bridged
with spark gaps.5 kV
