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L1 L2 L3 N PE L1 L2 L3 PEN type 2 surge arrester
type 3 surge arrester
125 A

cable length ≥ 5 m socket outlets

16 A ÜBERSPANNUNGSSCHUTZ DEHNguard DG S 440 FM DEHNguard DG S 440 FM DEHNguard DG S 440 FM
DEFECT
FUNCTION SURGE PROTECTOR
RCD fault indication
1 x SFL PRO 6X 19“ Part No. 909 251
for data cabinets
3 x DG S 440 FM Part No. 952 095
1 x MVS 1 3 Part No. 900 615
coordinated type 1
L1 L2 L3 lightning current arrester

DEHNguard DG MOD Cl 275 DEHNguard DG MOD Cl 275 DEHNguard DG MOD Cl 275 250 A

PEN fault indication sub-distribution board L L L L

with remote signalling contact:
1 x DG M TNC CI 275 FM Part No. 952 309 DEHNbloc Maxi DBM 1 440 FM DEHNbloc Maxi DBM 1 440 FM DEHNbloc DEHNbloc Maxi Maxi DBM 1 440 FM DBM 1 760 FM

type 2 surge arrester
fault indication
N/PEN N/PEN N/PEN

DEHNbloc ® Maxi
Directly coordinated with 3 x DBM 1 440 FM Part No. 961 145
type 2 Red/Line arresters 1 x EB DG 1000 1 3 Part No. 900 411
without additional cable length. MEB alt. 3 x DBM 1 440 Part No. 961 140
main distribution board Figure 8.1.3.11 SPDs used in a TN system – 400/690 V industrial
coordinated type 1 1 x EB DG 1000 1 3 Part No. 900 411
lightning current arrester L1 L2 L3 PEN

building

DEHNbloc ® Maxi DEHNbloc ® Maxi DEHNbloc ® Maxi 8.1.4 Use of SPDs in TT systems
DBM 1 255 S DBM 1 255 S DBM 1 255 S
In TT systems, overcurrent protective devices, residual cur-
rent protective devices (RCDs) and, in special cases, fault-
3 x DBM 1 255 S Part No. 900 220 voltage-operated protective devices can be used for “pro-
optionally available
with remote signalling tection against electric shock under fault conditions“. For
contact via DEHNsignal the installation of lightning current and surge arresters in
MEB
No separate backup fuse, inherently earth- TT systems, this means that they may only be arranged
fault and short-circuit-proof installation downstream of the protective devices described above to
L1 L2 L3 PEN I k ≤ 25 kA rms
ensure “protection against electric shock under fault condi-
Figure 8.1.3.10 SPDs used in a TN system – Arrester with integrated tions” in the event of a faulty SPD. If type 1 or type 2 SPDs
backup fuse in an industrial building are installed downstream of an RCD, it has to be expected

www.dehn-international.com LIGHTNING PROTECTION GUIDE 227