8
75
150
35
100
200
180
50
10
90
17.5
The length of the variable sealing end can be determined by means of the calculated separation distance
s
air
multiplied by the
factor 2
.
3. Variable sealing end in case of HVI
®
power Conductors
If the
HVI
®
power Conductor
is not connected to the earth-termination system, but to parts carrying
lightning voltage (e.g. metal capping of the roof parapet, ring conductor), Fig. 3 must be observed for the
effective length of the sealing end (see also Fig. 3.1a, page 9 and Fig. 3.1b, page 10).
No special installation conditions (direct connection) must be considered in the area below the separation
distance
“s”
of 17.5 cm (in air) on the earth connection element (see Fig. 3).
Length
Variable sealing end (cm)
Fig. 3
Variable sealing end
Maximum
variable sealing
end
HVI
®
power
Conductor
Equivalent separation
distance “s” (in air)
Maximum
HVI
®
power Conductor
Length
“L”
of the sealing end = separation distance
s
air
x
2
