Title: 36 Siemens GDB181-MO.pdf.pdf
Diagrams, cable lists, disposition drawings, specifications and instructions as per the customer or the contractor in chargeThird-party regulations issued by general contractors or building operatorsThe electrical safety of building automation and control systems supplied by Siemens depends primarily on the use of extra low-voltage with safe isolation from mains voltage.Depending on the type of extra low-voltage earthing, a distinction is to be made between SELV and PELV as per HD 384, “Electrical plants in buildings“: Unearthed = SELV (Safety Extra Low Voltage) Earthed = PELV (Protective Extra Low Voltage)Observe the following for grounding G0: As a rule, earthing and non-earthing of G0 is permissible for AC 24 V operating voltage. Decisive are the local regulations and customary procedures. For functional reasons, earthing may be required or not permissible.