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L1 L2 L3 NPE
type 3 surge arrester type 3 surge arrester type 3 surge arrester

socket outlets

S-Schutz

DEHNflex

cable length ≥ 5 m
1 x DSA 230 LA Part No. 924 370 1 x DFL M 255 Part No. 924 396 1 x STC 230 Part No. 924 350
for cable ducts for flush-mounted systems for existing socket outlets
16 A
RCD
125 A 125 A

L1 L2 L3 N L1 L2 L3 N

DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD NPE DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD NPE sub-distribution board
fault indication
PE PE

with remote signalling contact:
1 x DG M TT 275 Part No. 952 310 1 x DG M TT 275 FM Part No. 952 315
type 2 surge arrester type 2 surge arrester

DEHNbloc ® DEHNventil ®
cable length ≥ 15 m Coordinated with DEHNguard ® Directly coordinated with
without additional cable length. type 2 and 3 Red/Line arresters
without additional cable length.

type 1 coordinated type 1 type 1
lightning current arrester lightning current arrester combined arrester

315 A 315 A 315 A
main distribution board
L/N L’/N’ L/N L’/N’ L/N L’/N’ PE L/N L/N L/N PE L1 L1‘ L2 L2‘ L3 L3‘ N N‘

DEHNbloc DB H MOD 255 DEHNbloc DB H MOD 255 DEHNbloc DB H MOD 255 DEHNgap DGPH MOD 255 DEHNbloc DB M 1 255 DEHNbloc DB M 1 255 DEHNbloc DB M 1 255 DEHNgap DGP M 255 DEHNventil DV MOD 255 DEHNventil DV MOD 255 DEHNventil DV MOD 255 DEHNventil DV MOD NPE 50

N/PE(N) N/PE(N) N/PE(N) N N/PE(N) N/PE(N) N/PE(N) N PE

fault indication
3 x DBH M 1 255 Part No. 961 122 3 x DB M 1 255 Part No. 961 120 1 x DV M TT 255 FM Part No. 951 315
MEB 1 x DGPH M 255 Part No. 961 102 1 x DGP M 255 Part No. 961 101
1 x MVS 1 8 Part No. 900 611 1 x MVS 1 8 Part No. 900 611 alt. 1 x DV M TT 255 Part No. 951 310
L1 L2 L3 N Only required, if no fuse of the same or a lower nominal value is provided in the upstream system.
Figure 8.1.4.4 SPDs used in a TT system – Office building

230 LIGHTNING PROTECTION GUIDE www.dehn-international.com