28
5.3.2 Variable sealing end in case of
HVI Conductors
If the
HVI Conductor
is not connected to the earth-termination system, but to parts carrying lightning
voltage (e.g. capping of the roof parapet, ring conductor), Fig. 15 is decisive for the effective length of
the sealing end (see also Fig. 16, page 29 and Fig. 17, page 30).
No special installation conditions (direct connection) must be observed in the area below the separati
-
on distance “s” of 17.5 cm (in air) on the earth connection element (see Fig. 15).
Figure 15
Variable sealing end
Due to the variable sealing end and the resulting reduced length of the sealing end, no additional spa
-
cer must be installed. The length of the variable sealing end is determined by multiplying the calculated
separation distance in s
air
by the
factor 2
Length “L” of the sealing end = separation distance in s
air
x 2
Attention:
The variable sealing end can only be used for black
HVI Conductors
. When using a grey
HVI
Conductor
, the grey sheath must be removed in the sealing end range.
35
90
70
45
17.5
75
150
10
Maximum
HVI Conductor
Variable sealing
end
HVI Conductor
with mechanical
fixing (Part No.
105 275)
Length of the variable
sea
ling
end (cm)
Equivalent separation distan-
ce “s” (in air)