Hi Peter:
> No where does the standard state that by simply providing a
> Functional Earth, even through an appliance inlet (implying
> use of a power supply cord), the equipment is not considered
> Class II. One is simply limited to not marking with the
> aforementioned symbol.
>
> I'd appreciate hearing more from you on this Rich.
Unfortunately, the IEC scheme of safety, Class I,
Class II, and Class III, applies to products, not
to circuits.
I have and continue to advocate (in IEC TC 108)
that such classes should apply to CIRCUITS, not
to products.
The IEC 60950-1 standard recognizes that Class I
equipment may include some Class II construction.
Indeed, the standard expressly states that SELV
circuits may be separated from other circuits by
double or reinforced insulation and tested
accordingly (although the standard does not
provide guidance on segregrating Class I and Class
II circuits for such testing).
With regard to testing the complete product that
includes both Class I and Class II construction,
i.e., hi-pot and grounding continuity, the applied
tests are for Class I, not Class II. This is the
point I was trying to express to Raymond Li.
Best regards,
Rich
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your subscription, send mail to:
majord...@ieee.org
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Ron Pickard: emc-p...@hypercom.com
Dave Heald: emc_p...@symbol.com
For policy questions, send mail to:
Richard Nute: ri...@ieee.org
Jim Bacher: j.bac...@ieee.org
Archive is being moved, we will announce when it is back on-line.
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
