29
Variable sealing end on isolated ring conductors/cappings of the roof parapet
If several parts of an installation are to be protected, it is not advisable to route the
HVI
Conduc-
tor
from each air-termination system to the earth-termination system. The
HVI
Conductors
from the
air-termination system can be connected to e.g. an isolated ring conductor or to the capping of the
roof parapet. From this isolated ring conductor (capping of the roof parapet), several down conductors
can be routed to the earth-termination system. In this case, the partitioning coeffi cient
k
C
is reduced
downstream of the isolated ring conductor and the separation distance
“s”
is also reduced.
HVI
long
Conductors
(on a reel) can be used for this purpose (see Fig. 16 and 18 and instruction leaflet No.
1851 (variable sealing end)).
The isolated ring conductor must be installed on spacers and concrete bases e.g. on the roof level. The
calculated separation distance
“s”
must be observed.
Figure 16
Variable sealing end with spacer (Part No. 105 275)
spacer with EB ele-
ment and MV clamp,
aluminium, Part No.
105 275
min.
length L = S
air
variable sealing end
L=S
air
x 2
35 cm - max. 90 cm (standard)
S
air
HVI Conductor
connection to the
equipotential bonding
system of the building
isolated ring conductor
spacer
conductor holder,
e.g. Part No. 253
239 or 275 229
connection element
concrete base
,
17 kg, Part No. 102 010
