I read in !emc-pstc that Sam Wismer <swis...@acstestlab.com> wrote (in
<000501c2b98b$166cb190$0b01000a@sam>) about 'IEC vs. EN' on Sat, 11 Jan
2003:
>Thanks for the clarification.  Is there any documentation to that
>affect, or is it common practice to apply the EN transition period to
>the IEC basic standard that may be called for in the applied generic or
>ps standard?

Look at the introductory text of Annex ZA of the ENs.  As I said, it's
not very clear, but that is what we have.

The transition period of any EN comes from the Commission, formally
recorded in the Official Journal, although the dow in the Foreword of
the EN is normally consistent with it. It's not just 'common practice'
to apply it, it's the official procedure.

>  Also, why do some Generic or PS standards call for the IEC
>version instead of the EN version, especially if called for from an EN
>version?

Because CENELEC simply clones the IEC text without change (unless there
are Common Modifications or CENELEC-only amendments), and implements the
changes to the normative references by means of Annex ZA. 
-- 
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk 
Interested in professional sound reinforcement and distribution? Then go to 
http://www.isce.org.uk
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