Advantech ADAM-5550KW Series, User Manual

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Appendix B Grounding Reference
ADAM-5510KW Series User’s Manual B- 3
B.1 Grounding
B-1.1 The ‘Earth’ for reference
Figure B-1: Think the EARTH as 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.