g.:
a) Additional SPD close possible the re-
source protected. Type surge protection devices with minim-
um cross-section mm² copper, the standard
commercial minimum connection cross-section of
6 mm², must connected.
Feed line
IT terminals
Cable length (second SPD required)
Maximum cable length between SPD and terminal
Feed line
IT terminals
Cable length (earthed cable shield)
Shielded cable routing between SPD and terminal
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Chapter The internal lightning protection system
.5: Minimum dimensions equipotential bonding cables, protection class IV
Cross-sections
According IEC 60364-5-53, type 1+2 lightning
arrestors with cross-section least mm² of
copper capable carrying lightning current are re-
quired.
HAK
230/400 V
4
Z
5
UV
6 6
Building connection box
In near the central meter system/main distributor
Sub-distributor
Terminal devices
SPD type and/or type 2
SPD type type 3
Installation location SPDs (maximum cable length
between SPD and terminal m)
According VDE 0100-534, Chapter 534.
b) Use two-port SPDs the supply point.
b) Use one-port SPD (Up (50%) Uw) the supply
point.
With points and c), additional measures, such as
the use shielded cables, are necessary.
Installation locations and cable lengths
Looking the direction energy flow, additional
SPDs must installed after the infeed point the elec-
trical system, for example sub-distributors the
sockets.Material
Cross-section cables connecting different equipo-
tential busbars together with the earthing system
Cross-section cables connecting the internal
metallic installations with the equipotential busbar
Copper mm² mm²
Aluminium mm² mm²
Steel mm² mm²
Table 3.4.9 "Effect-
ive protection area SPDs", additional protection
measures should employed, the cable length
between the SPD and the resource protected is
more than e. Account must additionally
be taken the maximum short-circuit currents occur-
ring the place installation
