In message <[email protected]>, dated Thu, 5 Oct 2006, Robert Johnson <[email protected]> writes
>Since this shutdown method might be considered normal operation, have >you considered the consequences >of rating your wiring, switches, thermal contactor etc. for the short >circuit current capacity? These issues have to be taken into account anyway, because a mains short-circuit is a foreseeable single-fault condition. The short-circuit current SHOULD flow only until the primary protection device opens, of course. This is normally of the order of tens of milliseconds. The prospective short-circuit current may be estimated from the supply impedance data in IEC 60725. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Swine wave - a waveform whose spectrum is exceptionally difficult to calculate. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex 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/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: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
