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control unit
con-
troller
power supply
temperature
sensor
heating cable
moisture sensor
Type Part No.
DSH TT 2P 255 (TT/TN-S system) 941 110
DSH TN 255 (TN-S system) 941 200
(observe separation distance!)
Figure 9.29.3 Installation of lightning current arresters if the control unit (loss is accepted) is located near the entry point into a structure with
external lightning protection
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