In article <[email protected] emc.co.uk>, Julian Jones <[email protected]> writes
> Has anyone found a way round having to perform the 24 power on and > off cycles in the new flicker standard regarding inrush currents ? No; it works to the manufacturer's advantage, even though the test time is a bit longer. > Perhaps by using phase sensing ensure switching to ensure power > on occurs at 90 deg and 270 deg. Those are not necessarily the critical angles, either in theory or practice. 0 degrees is critical if the phase reference is the last zero crossing at switch-off and there is a transformer in the equipment. >Has this been accepted by any > accreditation agencies ? > I hope not, because the idea was tried out when the amendment was being written and it was found to give unacceptable errors. The point is that the arcing characteristics of the equipment's own mains switch (if it's a mechanical switch or relay) affect the results, and using an external solid-state switch gives unpredictably different results. The equipment's switch (mechanical or solid-state) *must* be used (unless it hasn't got one at all). -- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. 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: 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://www.ieeecommunities.org/emc-pstc
