Hi Richard:
The usual class Y value of 4,700pF presents an
impedance of only 1.13 ohms at 30MHz, so it
provides a very substantial unbalance to create CM
from a neighbour's DM
All of the products I have seen have two Y
capacitors, one from L to E, and one from N to E.
With these two capacitors, there should be no
significant unbalance caused by the Y capacitors.
Best regards,
Rich
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