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d.c.

air-termi-
nation rod d.c.
data line
IT system
earth-termi-
DNO kW/h nation system

foundation a.c.
earth electrode
foundat- Lightning equipotential bonding Local equipotential bonding
ion earth electrode MEB Lightning current / combined arrester Surge arrester
No. in Figure Protection for SPD * FM = Floating remote signalling contact Part No.
d.c. input of the inverter
For 1 MPPT DEHNcube DCU YPV SCI 1000 1M 900 910
For 2 MPPTs DEHNcube DCU YPV SCI 1000 2M 900 920
Per MPPT DEHNguard DG M YPV SCI 1000 FM * 952 515
a.c. side of the inverter

TN-S system DEHNshield DSH TNS 255 941 400
a.c. side of the grid connection
TN-C system DEHNventil DV M TNC 255 FM * 951 305
TN-S system DEHNventil DV M TNS 255 FM * 951 405
TT system DEHNventil DV M TT 255 FM * 951 315
Data interface
One pair, with operating voltages BLITZDUCTOR BXTU ML2 BD 0-180 920 249
up to 180 V + BXT BAS base part + 920 300
Remote maintenance
ISDN or DSL DEHNbox DBX U4 KT BD S 0-180 922 400
Earth-termination system / external lightning protection system
Equipotential bonding UNI saddle clamp 365 250
Round wire (Ø 10 mm) St/tZn 800 310
Round wire (Ø 10 mm) StSt (V4A) 860 010
Earthing conductor
Strip steel (30 x 3,5 mm) St/tZn 852 335
Strip steel (30 x 3,5 mm) StSt (V4A) 860 325
MV clamp StSt (V4A) 390 079
Connection element
alternative: SV clamp St/tZn 308 220
Air-termination system Angled air-termination tip (including 2 saddle clamps) 101 110
Figure 9.19.13 Lightning protection concept for a PV power plant with string inverter

382 LIGHTNING PROTECTION GUIDE www.dehn-international.com