A very quick and basic summary: Very roughly speaking, the UL marks can be interpretted as follows. (OK there are pages and pages of jargon attached to each but the quick messy answers are):
the UL, UL listed and CUL listed products are those that have been tested at a UL test facility and passed the relevant applicable product tests (safety) for such a device. The CUL denotes listing is acceptable to UL and harmonised Canadian standards. The list info and file will outline the standard applied (maybe UL1950 / UL60950) and models of the equipment covered. Such listed devices are manufactured at UL inspected factory facilities. The mirror image logo is applied to components and parts for which UL have a manufacturing scheme. This means parts marked with the logo have been tested using UL inspected methods and under a UL checked quality system. This could be on a cable such a a VW-1 rated cord or a PCB with V0 Rating etc. Adopting logo marked parts for use in a UL listed product makes for easier tracability of critical components. There is also a UL listed Accessory which is for devices intended to be installed in a host (like a card for a PC). This is like the UL, CUL mark but requires installation instructions as part of the assessment. Hope this helps: Bill Ellingford Approvals and Compliance manager Motion Media Technology -----Original Message----- From: Chris Maxwell [mailto:[email protected]] Sent: 22 February 2002 14:40 To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the "UL" in a circle. There is also the mirror lettered "RU". There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email [email protected] | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc 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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" * ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc 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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
