New Products

Easy Choice of SPDs for Use on roof-mounted Photovoltaic Systems
Place of installation of the surge protective devices
a)
Building without external lightning
protection
GJB
PC
~
=
6 mm² Cu
4
M
M
SEB
MEB
b)
Building with external lightning
protection and sufficient separation
distance
separation distance s
OK
≥ s
GJB
PC
4
~
=
6 mm² Cu
M
M
SEB
MEB
Equipotential bonding
For lightning and surge protection reasons, it is strongly recommended to connect the PV
frame as follows to the equipotential bonding system:
• Defined connection with at least 6 mm 2 copper at the PV frame (a + b).
• Defined connection with at least 16 mm 2 copper at the PV frame (c).
• Electrically conductive connection of the PV frames has to be ensured.
• The earth conductor is connected to the main earthing busbar of the building on ground
level.
• The earth conductor has to be installed in parallel and in close proximity to the d.c. and a.c.
cables / lines and accessory.
c)
separation distance s
not OK
< s
SEB
Building with external lightning
protection and insufficient
separation distance
M
PC
M
GJB
4
MEB
~
=
16 mm²
Cu
Note:
For more detailed information on lightning and surge protection measures for photovoltaic
systems, please refer to our brochure DS109 and application proposal No. 11 at www.dehn.de.
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