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a.c. box (interface
to cables laid on site)

a.c. power
connection
d.c. = = = = = =

a.c. ~ ~ ~ ~ ~ ~

a.c. cables (interconnected)

factory-mounted cables cables laid on site
Figure 9.18.18 Example: Building without external lightning protection system; surge protection for a microinverter located in the connection
box of the on-site cables

¨ Buildings without external lightning protection system microinverters and lightning current carrying type 1
= type 2 DEHNguard M … 275 arresters for alternat- DEHNventil M ... 255 arresters at the low-voltage infeed.
ing / three-phase current in close proximity to the micro- Independent of particular manufacturers, microinverters fea-
inverters and DEHNguard … 275 CI at the low-voltage ture data monitoring systems. If data is modulated to the
infeed. a.c. lines via the microinverters, a surge protective device
¨ Buildings with external lightning protection system and (for example DEHNbox DBX KT BD) must be provided on the
sufficient separation distance s = type 2 arresters, for separate receiving units (data export / data processing). The
example DEHNguard M … 275, in close proximity to the same applies to interface connections with downstream bus
micro inverters and lightning current carrying type 1 ar- systems and their voltage supply (e.g. Ethernet, ISDN).
resters at the low-voltage infeed, for example DEHNventil
M ... 255. Solar power generation systems are an integral part of to-
¨ Buildings with external lightning protection system and day’s electrical systems. They should be equipped with ad-
insufficient separation distance s = type 1 arresters, for equate lightning current and surge arresters, thus ensuring
example DEHNshield … 255, in close proximity to the long-term faultless operation of these sources of electricity.

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