Siemens DF8000 Installation Function & Configuration Commissioning Safety Regulations page 31

Building Technologies
Fire Safety & Security Products
Fig. 23 DF8046 Input circuit
EMC protection is provided using a dedicated circuit. It is capable of handling over-
voltages of 600V, which should be sufficient for most applications.
Signal isolation is provided by using separate voltage sources on the DF8003 CPU
module (internal and external power) and the internal opto-couplers. The isolation
voltage guaranteed by the opto-coupler is 2500V.
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