If UL-recognized PCB material, that is rated for your operating conditions, is used, spacing is determined by the min thickness of insulation (0.4mm).
"For the inner layers of multi-layer boards, the distance between two adjacent tracks on the same layer of a printed board is treated as distance through insulation (see 2.10.5.1)." Of course, where PCB features are "exposed", spacing is conventional. luck, Brian From: [email protected] [mailto:[email protected]]On Behalf Of Grace Lin Sent: Monday, August 07, 2006 6:47 AM To: [email protected] Subject: UL 60950 creepage and clearance Dear Group Members, I need your help to find an answer for one of our hardware engineers. The question is What is required for creepage and clearance of 230VAC hot, neutral and earth ground that is on internal layers of a PCB per Section 2.10.5.3 of UL 60950? The PCB is a multilayer PCB. Please let me know if you need more detail information. Your help is highly appreciated! Best regards, Grace Lin - 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 ______________________________________________________________________
