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3 x 230/400 V KNX 3 x 230/400 V KNX
KNX KNX
M SDB KNX M SDB KNX
SEB SEB

Type Part No.
shielded duct or metal pipe connected DV ZP TNC 255 (TN-C system) 900 390
to the main earthing terminal on both ends
DV ZP TT 255 (TN-S/TT system) 900 391
DG M TNS 275 (TN-S system) 952 400
DG M TT 275 (TT system) 952 310
BT 24 925 001
Figure 9.10.5 Lightning equipotential bonding is not required for the KNX cable due to zone expansion

KNX
3 x 230/400 V SDB KNX

M
Type Part No.
SEB
DV ZP TNC 255 (TN-C system) 900 390
DV ZP TT 255 (TN-S/TT system) 900 391
DG M TNS 275 (TN-S system) 952 400
DG M TT 275 (TT system) 952 310
BT 24 925 001

Figure 9.10.6 Lightning current arresters installed in the main power supply system and surge arresters installed at the distribution board of
the KNX system

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