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ADAM-5560 Series User Manual 176
B.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 non-
sense values. ‘Hot’ and ‘Neutral’ are just relational signals: you will get 110VAC or
220VAC by measuring these signals. 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 B.4 Normal and Common Modes
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 imped- ance.
B.2.4 Wire Impedance
Figure B.5 High Voltage Transmissions