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System instructions OBO isCon
4 2
Calculating, checking and maintaining the separation
distance
Note!
I f the approval authorities, the insurance company or the customer have
not yet specified whether the appropriate building should be protected by
a lightning protection system, we recommend that the planner carry out
a risk evaluation according to DIN EN 62305-2 /IEC 62305-2, which will
indicate whether a lightning protection system is required or not.
•
Calculate the separation distance at the connection point of the
isCon® conductor according to DIN EN 62305-3 (VDE 0185-305-3)/
IEC 62305-3 Section 6.3. Measure the distance (l) from the connection
point of the isCon
tection equipotential bonding, e.g. earthing system, metal parapet of
construction with electrically connected metal facade or steel re-
inforcement (high-rise building).
•
Check whether the calculated separation distance (s) is less than or
equal to the specified equivalent separation distance of the isCon
conductor.
•
If the specified equivalent separation distance is exceeded, then you
must install additional conductors:
– The current is split up if you install multiple insulated conductors in
parallel. The reduced current division coefficient k
es the calculated separation distance (s).
– We recommend installing the conductors at least 20 cm apart. This
keeps the magnetic fields to a minimum, preventing the conductors
from influencing each other.
– When conductors are routed directly beside one another, the induc-
tivity of the total arrangement is not reduced by the factor n, and
the current division coefficient k
– Install the conductors as far apart from each other as possible, if
the installation conditions permit this. Ideally, the second conductor
should be run to the ground on the other side of the building.
4 3
Conductor lengths and lightning protection classes
The possible length of an isCon
following formula, according to the calculated separation distance (s), the
lightning protection class (k
electrical insulation (k
s • k
L(m) =
k
The following Tab. 9 offers an example of the maximum possible lengths
of the isCon
the conductor lengths shown there be insufficient for the construction
project, we recommend having a lightning protection specialist carry out
a detailed calculation of the factor k
formula shows that longer conductor lengths are possible with a greater
number of conductors and thus the reduction of the factor k
lightning protection
®
conductor to the next level of the lightning pro-
®
conductor can be calculated using the
®
), the number of conductors used (k
i
) (see DIN EN 62305-3):
m
m
• k
c
i
conductor at a separation distance s = 0.75 m in air. Should
®
Planning an installation
thus also reduc-
c
is not reduced accordingly.
c
using the building data. The above
c
®
) and the
c
.
c
EN | 23
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