Amund: See 3.4.6 - Single-phase and d.c. equipment
You have to break each pole simultaneously, except that a single-pole disconnect device can be used to disconnect the line conductor where it is possible to rely on the identification of the earthed conductor in a dc mains supply. It is typically true for DC centralized power systems that the earthed conductor is clearly identified, and you would only need a switch in the unearthed pole. Regards, Don Gies, N.C.E Senior Product Compliance Engineer Lucent Technologies Holmdel, NJ 07733 USA From: Amund Westin [mailto:[email protected]] Sent: Thursday, September 15, 2005 12:52 AM To: [email protected] Subject: Power switch / IEC60950-1 An IT equipment use supply power in the range 18-72VDC and shall comply according to IEC60950-1. Are there any requirements to the power switch, such that the switch shall break both leads (+ and -) during operation? Regards Amund - 2005 IEEE Symposium on Product Safety Engineering 3-4 October Schaumburg, IL http://www.ieee-pses.org/symposium 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 - 2005 IEEE Symposium on Product Safety Engineering 3-4 October Schaumburg, IL http://www.ieee-pses.org/symposium 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
