alfasolar GmbH
Ahrensburger Str. 4 6, 30659 Hannover
Geschäftsführer:
Dipl.-Ing. M. Denz (CEO) / Dipl.-Kfm. K.-W. Hoffmann (CFO)
Amtsgericht Hannover HRB 544 55
Gerichtsstand und Sitz: Hannover
Seite 22 von 29
Tel:
Fax:
Mail:
Web:
+49 (0) 511-261 447-0
+49 (0) 511-261 447-50
sales@alfasolar.de
www.alfasolar.de
Revision-Index:
Issued:
Doc.-Nr.
08
2012-12-13
ALE-IEC-01
3.4.13
Lightning and surge voltage protection
The requirements for lightning and surge voltage protection must be determined according to
the specific local conditions (building with or without external lightning conductor), to the
technology employed (in particular inverter or solar module) and on the local and national
regulations and directives. The legal regulations must be observed in all respects. Otherwise it
is assumed that the installation complies with the state-of-the-art.
Equipotential bonding
All metallic parts of the photovoltaic system must be connected electrically and, depending on
whether the building has a lightning conductor system, connected to the equipotential bond-
ing conductor. If the building has a lightning conductor system and the minimum distances to
this system are not observed, the photovoltaic system must be integrated into the system in a
manner appropriate to the building and using the normal methods using a grounding conduc-
tor.
Where common grounding hardware (nuts, bolts, star washers, spilt-ring lock washers, flat
washers) and the like is used, the attachment must be made in conformance with the ground-
ing device manufacturer`s instructions.
3.4.14
Grounding of alfasolar solar modules
Generally you can make the grounding for the whole PV-generator or for each single module.
To install your PV-system in safe manner you have to follow the national electrical standards
of the country where the system is to be installed.
Grounding of an alfasolar PV- generator alfasolar A2 rail system
As the module frames are connected as electrical conductors to
the rail when using the alfasolar installation system, you have the
possibility to connect the individual module rows together and to
lay a cable from there to the equipotential bonding conductor.
WARNING: make sure that you use the centre clamps and the flat
washer with its sharp edge towards the frame, so that the coating
is penetrated! This can be carried out, for example, using cable
shoes and M10 nuts/screws in the lateral grooves (see figure).
When selecting the connection materials, pay attention to the
electrochemical displacement series (contact corrosion). If the
normal aluminium materials used in lightning conductor systems
are employed, no particular precautions are necessary.
Grounding of single alfasolar solar modules without alfasolar A2 rail system
If some other method of installation is employed, the modules
can be integrated into the equipotential binding system via the
M4 grounding bores in the middle of the module frames as
described above using corresponding cable shoes and screws.
For appropriate sizes and materials on the rail system-side
please ask the deliverer of your mounting system.
W A R N I N G
!
The grounding connection must not be interrupted
or destroyed during routine maintenance of a module. Bolts,
screws or other grounding connections must not be used for
mechanically securing the complete installation to supporting
surfaces or frameworks.
Fig.15: grounding system of the A2
Fig. 16: grounding advice
M4-grounding hole