Page 431 - 35_DS702_E_2014_Lightning_Protection_Guide

the ground (Supplement 1 of the German DIN EN 62305-3 Barrier systems have been protected against lightning strikes
(VDE 0185-305-3) standard) and possibly extends over the and surges over decades to ensure faultless operation. As far
entire cable route up to the building, damage to the cable is as outdoor socket outlets are concerned, lightning and surge
prevented if lightning strikes the ground. protection measures may have to be taken at the design stage,
depending on their intended use. An earth electrode is also re-
Sample applications in Figure 9.30.3 quired for these pieces of equipment to conduct the lightning
If lightning strikes to external equipment can be ruled out currents flowing via DEHNshield from the building to earth.
(LPZ 0 B ), partial lightning currents still pose a risk when light- Also in this case, the interconnection of earth electrodes is
ning hits the external lightning protection system of the main recommended, but not mandatory. Equipment attached to the
building. In this case, partial lightning currents may travel building, which is directly connected to the earth-termination
system of the building and the supply line, can be protected by
through the cables to equipment with a remote earth potential type 2 arresters.
(charging stations for electric vehicles, outdoor socket outlets
and barrier systems protected by air-termination rods). An application-optimised type 1 arrester such as DEHNshield
To ensure safe traffic flow, future concepts of charging stations is suitable for protecting specific applications. This, however,
for electric vehicles require high availability as is the case with requires that the described measures are implemented consist-
petrol stations. Since these charging stations are located out- ently and that the technical parameters of the installation to be
side buildings and are equipped with sensitive electrical sys- protected are observed. A properly functioning earth-termina-
tems, lightning protection is vital to minimise interference with tion system, for example, is one of the most important aspects
the installation as a result of lightning strikes and surges. for the overall system.

430 LIGHTNING PROTECTION GUIDE www.dehn-international.com