Advantech ADAM-6050 18-Channel Isolated Digital I/O Modbus TCP Module ADAM-6050-BE Scheda Tecnica

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Appendix C  
C.2  Grounding
C.2.1 The ‘Earth’ for Reference
Figure C.1: Think of the Earth as a Ground.
As you know, the EARTH cannot be conductive. However, all build- ings 
lie on, or in, the EARTH. Steel, concrete and associated cables (such as 
lighting arresters) and power system were connected to EARTH. Think of 
them as resistors. All of those infinite parallel resistors make the EARTH 
as a single reference point.