C.2.3 normal mode and common mode, Figure c.4: normal and common mode, Figure c.4:normal and common mode – B&B Electronics ADAM-6066 - Manual User Manual

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Appendix C

C.2.3 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.

Figure C.4: Normal and Common Mode.

• Ground-pin is longer than others, for first contact to power system and

noise bypass.

• Neutral-pin is broader than Live-pin, for reducing contact impedance.