Brochure/Catalogue

Surge protection installation instructions
Installation instructions for Weidmüller‘s VPU I, VPU-II and
VPU-III lightning/surge protection in power grids
Surge protection should only be installed by trained
personnel. Please follow all local regulations concerning
connection methods during the installation.
1 Application
Type I VPU I lightning protection and the Type II VPU II
surge protection are used to protect low-voltage consumer
installations and electronic devices against surge voltages
that may arise as a result of atmospheric discharges
(thunderstorms) or switching operations.
The VPU I is a Type I/II lightning arrester according to
IEC 61643-11, ENV 61024-1 and IEC 1312-1. In the event
of a lightning strike, the required equipotential bonding
(lightning protection equipotential bonding according to
IEC 62305 part 1) between the building lightning protection
and the earthing system for the power supply is provided by
built-in varistors.
The VPU II complies with Type II of IEC 61643-11 and
ÖVE SN60 part 4 and part 1. Metal-oxide varistors are used
as voltage-limiting components. The VPU III and VPO-DS
Type III surge protection for end devices protect low-voltage
consumer installations and electronic devices against surges
and switching operations. The VPU III or VPO DS is installed
in addition to the VPU II in the small distributor, oor
distributor, cable conduit, or directly behind the outlet. They
meet the requirements of IEC 61643-11 and EN 61643-11.
2 Installation location
The VPU II needs to be installed in the meter cabinet or in
the distributor so that the space for connection terminals
is not accessible to unauthorised persons. The VPU I is
installed near the power feed so that there is the required
lightning current equipotential bonding between the
lightning protection facility and the power distribution
system. All arresters must be installed by a qualied
electrician.
The VPU I LCF can be installed upstream of the meter.
VDE 0100 part 534 “Selection and installation of
equipment“ describes the construction of facilities with
surge protection equipment.
This is related to the following standards:
a. IEC 60364-4-43:
“Protection for surge voltages from atmospheric origins and
from switching operations”
b. IEC 60364-5-53:
“Selection and installation of electrical equipment”
c. IEC 61024-1:
“Protection of buildings against lightning strikes”
d. IEC 61312-1:
“Protection against lightning electromagnetic pulses”
3 Electrical connection
The shortest possible cables should be used to connect the
VPU I lightning arrester and the VPU II surge protector with
the phase conductors (L1, L2, L3) or the neutral wire (N) and
the earth (PE) on the consumer installation. Unprotected
cables should never run in parallel with protected cables
(You will nd sample connections on the removable
supplement).
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The basics of lightning and surge protection
W.212028840000