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operations building

ISDN

NTBA
control cabinet
PROFIBUS DP PROFIBUS PA

NT

MEB

No. Protection for… Surge protective device Part No.
Telecommunication / data technology
BLITZDUCTOR BXT ML2 BD 180 920 247
Fixed line network
+ BXT BAS base part + 920 300
ISDN devices DEHNprotector DPRO 23 ISDN 909 320
Coaxial cable (video transmission system) UGKF BNC 929 010
Measuring and control equipment
BLITZDUCTOR BXT ML4 BD HF 5 920 371
PROFIBUS DP
+ BXT BAS base part + 920 300
BLITZDUCTOR BXT ML4 BE 24 920 324
Analogue signals (non-hazardous area)
+ BXT BAS base part + 920 300
BLITZDUCTOR BXT ML2 BD S EX 24 920 280
PROFIBUS PA Ex (i)
+ BXT BAS EX base part + 920 301
Temperature measurement PT 100, PT 1000, Ni 1000 BLITZDUCTOR BXT ML4 BC 24 920 354
(non-hazardous area) + BXT BAS base part + 920 300
Field devices
4 – 20 mA, PROFIBUS PA, Fieldbus Foundation, Ex (i) DPI MD EX 24 M 2 929 960
4 – 20 mA, PROFIBUS PA, Fieldbus Foundation,
non-hazardous area DPI MD 24 M 2S 929 941
Figure 9.3.11 Surge protection for the installations of information technology systems

The control unit is installed in the control cabinet. In addition quency converters and actuators, must be protected by install-
to digital inputs and outputs, e.g. PT 100 signals, 4 – 20 mA sig- ing BLITZDUCTOR XT lightning current arresters (category D1)
nals or the like are evaluated here. To ensure undisturbed and as close as possible to the entrance point into the building
permanent transmission of the measured data to the control (Figure 9.3.12). A contactless and fast arrester testing sys-
unit in the control cabinet at any time, the control and signal tem (LifeCheck) is integrated in these surge protective devices.
lines extending beyond the buildings, for example that of fre- Surge protective devices for information technology systems

282 LIGHTNING PROTECTION GUIDE www.dehn-international.com