Hi John:
> Now we have sub-classes Y1 to Y4. Y capacitors can be used in locations
> where neither side is grounded, but in the OP's context, grounding is
> involved.
What are the definitions of the various Y
capacitors in the most edition of IEC 384?
OP?
> >A Y-cap can be used between primary and secondary of a Class II
> >product and it is still designated a Y-cap. Such construction
> >is not uncommon for EMC suppression in Class II products.
>
> How does that suppress emissions? It seems to me that they would be
> encouraged.
High frequencies that are coupled to the floating
secondary are returned to the source via the Y
cap. (I'm not an EMC engineer, so I can't provide
a good explanation; however, for our products, this
construction is both necessary and effective in
suppressing emissions.)
> I can't find any Y-rated components of the type you imply. What values
> are involved?
See:
Ever Grace Electronic Industrials Co. Ltd.
http://www.etelec.com.tw/
Jya Nay Co. Ltd.
http://www.jyanay.com.tw/
These Y capacitors are fully certified as Y capacitors
and range from 100 pF (or less) to 10000 pF.
Rich
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