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Would require working voltage data, whether unit is connected to cable system, and if protection of user from hazardous V is required. luck, Brian -----Original Message----- From: Deneault, Alexandre [ mailto:[email protected]] Sent: Monday, August 16, 2004 8:33 AM To: '[email protected]' Subject: DC mains supply vs transients in centralized office Hi, IEC60950-1 says "for equipment to be supplied from a DC mains supply that is connected to protective earth and is entirely within a single building, the mains transient voltage is considered to be zero." In order to avoid over-designing in regards with, clearances, creepage distances, electric strength test, etc... could someone provide a ratio for centralized office (using centralized DC mains) respecting both conditions mentioned above. Thanks! Alexandre Deneault Spécialiste de certification/Certification specialist ------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. IEEE PSES Main Website: http://www.ieee-pses.org/ To post a message send your e-mail to [email protected] Instructions for use of the list server: 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
