[email protected] wrote (in <[email protected]>) about 'AC mains impedance', on Thu, 21 Jul 2005: >Do they supply an average and what the standard deviation is?
No, but there are values given for various percentages in different countries: 98% 95% 90% 85% >And, does it follow a Gaussian distribution? Well no, it wouldn't. There is naturally a much larger spread above the mode (most frequent value) than below. > >Designing for the case of 19 out of 20 sites doesn't make me >comfortable. I would want to design for the highest percentage of sites >while balancing the manufacturing costs. Well, you are unlikely to find a household 100 A supply with less than half the reference impedance, but in some remote areas, you might get five times the reference impedance. The report does give an algorithm for calculating the maximum impedance that OUGHT to be achieved for supplies over 100 A, but don't taken any bets. -- Regards, John Woodgate, OOO - Own Opinions Only. Deadlines are 90% of deadliness. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [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://www.ieeecommunities.org/emc-pstc
