Hi John:
> For professional audio, it's common to design to Class II requirements
> and then add an earthed screen in the mains or SMPS isolating
> transformer, and a user option to connect signal common to the PEC or
> not.
This seems to bring us full circle, back to
the original topic, that of Class I and Class
II insulations in parallel.
I would presume that professional audio uses
Class II requirements between the mains and the
earthed screen, i.e., the connection to the PEC
is not a safegurd function?
IEC 60335 3rd defines Class OI as a basic-
insulated product with a functional earth
terminal for optional, non-safeguard connection
to earth.
If the product is Class II, and is provided
with a functional earth terminal for optional
non-safeguard connection to earth, is it then
a Class II-I? :-)
Best regards,
Rich
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