5
2.1 Variable sealing end on isolated ring conductors/metal cappings of the roof parapet
If several parts of an installation are to be protected, it is not advisable to lead the
HVI
®
Conductors
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 metal capping of the
roof parapet. From this isolated ring conductor (metal capping of the roof parapet), several down conduc
-
tors can be routed to the earth-termination system. This reduces the partitioning coefficient
kc
downstream of the isolated ring conductor and thus also the separation distance
“s”.
HVI
®
Conductors
(reeled up on a drum) can be used for this purpose (see also Fig. 2.1a, page 5 and Fig. 2.1b, page 6).
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.
spacer with EB element
and MV clamp
(aluminium),
Part No. 105 275
conductor holder,
e.g. Part No. 253 339
or 275 229
min.
length,
L = s
air
s
air
L
=
s
air
x
2
Fig. 2.1a
Variable sealing end on an isolated ring conductor
variable sealing end
35 cm - max.
90 cm (standard)
connection to the
equipotential bonding
system of the building
isolated ring conductor
spacer
connection element
concrete base
17 kg, Part No. 102 010
HVI
®
Conductor
