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Charles-
First
off, you should purchase the latest Draft, D4.2. It references EN60950-1:2001,
although only to supply the definition of Limited Power Source, and test
methodologies for determining isolation voltages. P802.3af is not a product
safety specification. Many 802.3af products may not be, for
example, ITE equipment, but may fall under other safety standards such as
UL508 for industrial controls.
If you
do not have a copy of the full 802.3-2002 standard, it may be downloaded free of
charge from the IEEE SA website at: http://www.standards.ieee.org/getieee802/
You
should read this to understand the way isolation is specified in 802.3 if the
terms Environment A and Environment B are unfamiliar. P802.3af does not address
any of the issues you cite in your item 2, since these are beyond the scope of
the draft. P802.3af does not address the primary power supply, only the output
characteristics of the PSE. Primary power and applications space are
implementation specific, and you must determine which elements of EN60950 apply
to your application. Language within 802.3af makes it clear that products must
comply with all local and national codes that are applicable to the product, and
that such compliance is beyond the scope of the draft.
The
802.3af draft gives the PD designer the information necessary
create the interface to a PSE. Any other issues are implementation-specific
and out of scope.
Regards,
Steven B. Carlson
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