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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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