I read in !emc-pstc that [email protected] wrote (in <846BF526A205F8 4BA2B6045BBF7E9A6A04675914@flbocexu05>) about 'Surge - injection point on screened cable' on Thu, 31 Oct 2002: >This is a good example of an inarticulate clause in a standard. One sentence >in clause 7.5 reads "Normally, the maximum length of the specified shielded >cable shall be used. But the following sentence reads "With respect to the >frequency spectrum of the surge 20 m length of the specified shielded cable >shall be used in non-inductively bundled configuration for physical >reasons." Duh! What they heck are they trying to say in that last sentence? >Are we expected to use the maximum length cable specified for the >application but no longer than 20 m? That's seems to be what is being said >in a convoluted way.
I think that is indeed what is meant. If the maximum possible length is 1000 m, you still only need to test with 20 m. If the maximum length is less than 20 m, you use the maximum length. The poor English of the 61000-4 series has to be the responsibility of the Anglophone members of the SC77B working groups. They have, it seems, allowed the German (mostly) experts to write the texts and have not been sufficiently motivated to clarify the language. Some times the French text is clearer, but in this case it is not, and does not include the phrase 'for physical reasons'. -- 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 PLEASE do NOT copy news posts to me by E-MAIL! ------------------------------------------- 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
