GeoDesy FSO lightning protection requirements for FSO - Manual (Page 2)

GeoDesy Kft. Telefon: 06‐1‐481‐2050
H‐1116 Budapest, Kondorfa str. 6‐8. Fax.: 06‐1‐481‐2049
E‐mail: info@geodesy‐fso.com
http://www.geodesy‐fso.com
2
Horváth Holding
Investment PLC.
SUBJECT OF THIS DOCUMENT:
Due to the double isolation techniques applied in the Geodesy FSO devices, connecting it into a buildings lightning
protection, might raise the possibility of the lightning caused damages. In this document we will try to summarize the
best installation practices how to avoid damages cause by lightning strike.
OVERVIEW
The electromagnetic pulse released by a lightning strike or the strike itself is the highest risk, for electrical equipments
placed outside of buildings.
The energy of the lightning strikes has to be grounded. This means that the power of the strike should be collected
and drained to the ground through a network of grounded cables. These cables have to be insulated from the devices
it protects.
According to the modern philosophy of the insulated of the insulated lightning protection method to protect the
equipments from the effects of lightning have to be placed inside of a so called “protected zone”. In this zone the
equipment is not exposed to the lightning.
If the system is under the “protection zone” of the insulated lightning protection solution, then it is not necessary, to
be grounded. The grounding in this case will decrease the protection level as it might open a new path for the energy
of the lightning to drain. This might make the behaviour of the lightning unpredictable.
POWER SUPPLY CONSIDERATIONS
The power supplies are protected on the input and also on the output by fuses, so it won’t pass the large energy of
the lightning.
Third party power supplies have to be confirmed by the manufacturer, that it is suitable for powering outdoor
equipments.
CABLES
Data and power cables are also a consideration of the lightning protection. We will try to summarize it.
OPTICAL CABLES
Optical cables and patch cords are not conducting electricity, so in the case of fiber cables it is not a subject of
protection.
COPPER CABLES
All copper feeds should be terminated into an approved Ground Fault Interrupters, with surge protection per local
electrical codes or installation practices.