The standard offers help selecting and installing
surge protection devices order reduce downtime
in low-voltage systems. IEC 60364-5-53 recom-
mends total length for the connection cable the
surge protection device less than 0. The new
standards 60364-4-443 and IEC 60364-4-44 de-
scribe the decision criteria when and how surge
protection measures are required systems and
buildings. the lightning protection zone, trans-
ition from LPZ LPZ all metal installations must
be integrated into the equipotential bonding system. To
minimise the voltage drop the supply line, the
length, and hence inductance, the cable must be
kept low possible.
Active lines must earthed using suitable surge ar-
restors. The sum the protection level the surge
protection devices and the voltage drop the supply
lines must remain below the voltage resistance.TBS
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3. buildings with external
lightning protection system per IEC 62305, type 1
surge protection devices must used connect the
supply lines routed from outside the building the
lightning protection equipotential bonding the trans-
itions between lightning protection zones and 1.
The following minimum cross-sections must ob-
served for lightning protection equipotential bonding:
for copper mm², for aluminium mm² and for
iron mm².
As 2016, surge protection all new buildings and
in electrical installations mandatory for electrical in-
stallations conforming with the standard.5 and cer-
tainly more than m. The ohmic component
is negligible compared the inductive component.3.
Maximum length supply line per IEC 60364-5-53
Main earthing busbar protective conductor rail
L1
Supply line protection device
L2
Connection between protection device and equipoten-
tial bonding
Connection length, alternative wiring and cross-
sections
If the surge protection device tripped surge
voltage, the supply lines, fuse and protection device
conduct surge current.
Mounting the type 1+2 V50 combination arrestor in
the upper meter connection compartment
TBS
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195
Chapter The internal lightning protection system
.
Minimum cross-sections for lightning protection
equipotential bonding
The length the connection cable for surge protec-
tion devices significant aspect the installation
standard IEC 60364-5-53. Surge protection
devices can also known “surge protective
devices” and “devices for protection against surges”.5 Installation requirements
The installation standard for surge protection devices,
IEC 60364-5-53, covers protection against surge
voltages resulting from indirect and remote lightning
strikes and switching operations. ensure adequate protec-
tion systems and devices, the maximum surge
voltage that can occur must smaller than equal
to the surge voltage resistance the devices be
protected. This produces voltage drop
at the impedances the lines.2
