Since the built-in protection device will trip at a current much lower than what would trip the service panel breaker, can you do a "high resistance short" that would not trip a service panel breaker but serve your purpose?
> From: [email protected] > Date: Thu, 5 Oct 2006 12:25:11 -0400 > To: [email protected] > Subject: shorting the mains prohibited - Help > > Gentlemen, > > I need your collective memory. > > I have an engineer that wishes to design a protection mechanism to apply a > short circuit across the mains in order to open a protection device > upstream to stop an over-heating fault. The protection device would be in > the product, we are not talking about depending on the protection in the > service panel. I will not let them go there. > > I remember somewhere in the past that one of the standards, or perhaps a > country deviation, specifically forbid shorting the mains as a means of > protection but I cannot find it. I think it is from the era when we were > using IEC 380 or 435 and UL 478 but I am not sure. > > Can someone out there point me to the standard and clause? or perhaps the > deviation or an OSM decision? > > I am looking for all of the arguments against this practice I can pull > together because I do not feel it is sound. It is one thing to crowbar the > output of a power supply to protect an expensive logic board from a power > supply over-voltage failure. It is quite another to short the mains input. > > Many thanks, > > Gregory H. McClure > Lexmark Product Safety > 859 232 3240 office > 859 232 6882 fax > > Confidentiality Notice: > This e-mail message, including any attachment, is for the sole use of the > intended recipient(s) and may contain confidential information. Any > unauthorized review, use, disclosure or distribution is strictly > prohibited. If you are not the intended recipient, please contact the > sender, by e-mail, and destroy all copies of the original message. > > - > ---------------------------------------------------------------- > 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 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 ______________________________________________________________________
