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kWh
E
under-road radiator
DNO MEB
SEB
Figure 2a

CCTV system

lamp post

E E
kWh
interconnection of earth electrodes
DNO MEB
SEB
Figure 2b
SEB: Service Entrance Box earth electrodes interconnected in a defined way
MEB: Main Earthing Busbar (to ensure that they are capable of carrying lightning currents)
LPZ: Lightning Protection Zone earth electrodes interconnected in an undefined way
DNO: Distribution Network Operator
No. in Fig. Surge protective device Part No.
DEHNventil modular DV M TNS 255 (TN-S systems) or 951 400
DEHNventil modular DV M TT 255 (TT systems) or 951 310
DEHNventil DV ZP TT 255 (TT systems) 900 391
DEHNshield DSH TNS 255 (TN-S systems) or 941 400
DEHNshield DSH TT 255 (TT systems) or 941 310
DEHNshield DSH TN 255 (single-phase TN systems) or 941 200
DEHNshield DSH TT 2P 255 (single-phase TT and TN systems) 941 110
DEHNguard modular DG M TNS 275 (TN-S systems) or 952 400
DEHNguard modular DG M TT 275 (TT systems) or 952 310
DEHNguard modular DG M TN 275 (TN systems) or 952 200
DEHNguard modular DG M TT 2P 275 (single-phase TT and TN systems) 952 110
Figure 9.30.2 Application-optimised use of DEHNshield with reference to an under-road radiator at the entrance to an underground car park
(2a), a lamp post and a CCTV system (2b)

428 LIGHTNING PROTECTION GUIDE www.dehn-international.com