25 | DE
Mounting instructions isCon
®
lightning protection system
Planning an installation
6 2
Calculating, checking and maintaining the separation
distance
Note!
If 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, the planner should carry out a risk evalu-
ation 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 connec-
tion point of the isCon
®
conductor to the next level of the lightning
protection 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, you must
install additional conductors:
– The current is split up if you install multiple insulated conductors
in parallel. The reduced current division coefficient k
c
thus also
reduces the calculated separation distance (s).
– Install 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 in-
ductivity of the total arrangement is not reduced by the factor n,
and the current division coefficient k
c
is not reduced accordingly.
– Install the conductors as far apart from each other as pos-
sible, if the installation conditions permit this. Ideally, the second
conductor should be run to the ground on the other side of the
building.
6 3
Conductor lengths and lightning protection classes
The possible length of an isCon
®
conductor can be calculated using the
following formula, according to the calculated separation distance (s), the
lightning protection class (k
i
), the number of conductors used (k
c
) and the
electrical insulation (k
m
) (see DIN EN 62305-3):
L(m) =
s • k
m
k
c
• k
i
The following Tab. 8 offers an example of the maximum possible lengths
of the isCon
®
conductor at a separation distance s = 0.75 m in air.
Should the conductor lengths shown there be insufficient for the con-
struction project, we recommend having a lightning protection specialist
carry out a detailed calculation of the factor k
c
using the building data.
The above formula shows that longer conductor lengths are possible with
a greater number of conductors and thus the reduction of the factor k
c
.
