Specification Of Hvi Conductors; Application / Design Of Hvi Conductors - dehn HVI Installation Instructions Manual

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
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
pending on the class of LPS:
LPS II max. 12.5 m
LPS III/IV max. 18.75 m
semiconductive outer sheath
insulating layer
Figure 1 Design of HVI Conductors
6
= 1, the following maximum conductor lengths are permitted de-
c
solid/stranded copper conductor
(19 mm²)
= 1 in air, or k = 0.5
m m