Specification Of Hvi ® Power Conductors; Design Of Hvi Power Conductors - DEHN + SÖHNE HVI power Montageanleitung

3. Specification of HVI
3.1 Design of HVI
HVI power Conductors are high-voltage-resistant, insulated down conductors with a semiconducti-
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ve outer sheath (see Fig. 1).
They are typically used as insulated down conductors for lightning protection systems to maintain the
separation distance in accordance with IEC 62305-3. At first, the separation distance "s" must be
calculated as described in 6.3 of IEC 62305-3, with a material factor k
material. It must be checked whether this calculated separation distance can be implemented by means
of the equivalent separation distance of the HVI
page 7):
calculated separation distance ≤ equivalent separation distance.
If this is not the case, measures according to 6.2, page 20 must be taken.
The length required for calculating the separation distance "s" is measured from the head piece to
the next lightning equipotential bonding level, e.g. the earth-termination system.
In case of a down conductor with k
pending on the class of LPS:
LPS I max. 11.25 m
LPS II max. 15.0 m
LPS III max. 22.5 m
semiconductive outer sheath (outer
semiconductor, black)
insulating layer
smoothing layer
Figure 1 Design of
6
power Conductors
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power Conductors
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= 1, the following maximum conductor lengths are permitted de-
c
stranded copper
conductor (25 mm²)
HVI power Conductors
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power Conductor (see technical data, Table 1 and
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= 1 in air, or k = 0.5 for solid
m m