1. See UL796, 9.1 for support of current-carrying components at specified voltage levels. 2. See UL796, clause 9. Some test methods for DSR rating are in the UL746 series. 3. Yes for PLC, which can 'infer' CTI.
Brian From: Vincent Lee [mailto:[email protected]] Sent: Monday, April 16, 2018 8:47 PM To: [email protected] Subject: [PSES] UL's Direct Support Requirements symbol on PCB Hi all, Good evening 1) May I know what does the UL's Direct Support Requirements (DSR) triangle symbol printed on PCB really mean ? 2) What are the requirements to be met before this symbol can be printed on PCB ? 3) Does Direct Support Requirements have any relationship with other key parameters, e.g. Comparative Tracking Index? Hope to hear from you soon. Thank a lot. Vincent Regards, Vincent - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
