6
2.
Specification of HVI
Conductors
2.1 Application / design of HVI
Conductors
These installation instructions specifically describe the use of
HVI Conductors
inside/outside the sup
-
porting tube and illustrate how
HVI Conductors
installed inside and outside the supporting tube (up
to four conductors) are processed/assembled.
HVI Conductors
are high-voltage-resistant, insulated down conductors with a voltage-controlled ou
-
ter sheath (see Fig. 1).
They are typically used as insulated down conductors in lightning protection systems to maintain the
separation distance in accordance with IEC 62305-3. At first, the
separation distance “s”
must be
calculated as explained in IEC 62305-3, subclause 6.3, with a material factor of k
m
= 1 in air, or k
m
= 0.5
for solid material. It must be checked whether this calculated separation distance can be implemented
with the equivalent separation distance of the
HVI Conductor
(see technical data, Table 1, page 7):
calculated separation distance ≤ equivalent separation distance
If this is not the case, the measures described in 5.3, page 25 must be taken. The length for calculating
the
separation distance “s”
must be measured from the head piece to the next lightning equipoten
-
tial bonding level, e.g. the earth-termination system.
In case of a down conductor with k
c
= 1, the following maximum conductor lengths are permitted de
-
pending on the class of LPS:
LPS II max. 12.5 m
LPS III/IV max. 18.75 m
Figure 1 Design of HVI
Conductors
solid/stranded copper conductor
(19 mm²)
semiconductive outer sheath
insulating layer
