B&B Electronics ADAM-5000_TCP - Manual - Manual (Page 328)

Grounding Reference Appendix C
Figure C-3: Normal mode and Common modC
1-3 Normal Mode and Common Mode
Have you ever tried to
measure the voltage between a live circuit and a concrete floor? How
about the voltage between neutral and a concrete floor? You will get
nonsense values. ‘Hot’ and ‘Neutral’ are just rela- tional signals: you
will get 110VAC or 220VAC by measuring these sig- nals. Normal
mode and common mode just show you that the Frame Ground is the
most important reference signal for all the systems and equipments.
ADAM-5000/TCP User’s Manual
C-5