Chris, The "RU" is the Recognized mark. "It is applicable to products that are incomplete in construction features or limited performance capabilities so as not to warrant their acceptability as a field installed component." This mark does not look like a UL mark because it is not for public or retail use. If this mark is displayed on a retail advertisement or package it is not proper use of the mark.
UL in a circle is the "Listing" Mark. It is authorized on products that comply with the requirements of UL. UL in a Circle with a C at the lower right signifies products that have been tested by UL to the Canadian requirements. Of course UL in a circle with US at the lower left and C at the lower right signifies products that have been tested by UL to the UL requirements and the Canadian requirements. UL in a circle with the word Classified around the top of the circle signifies products that are classified with respect to: a: properties of the product b: A limited spectrum of hazards to life or property c: suitability for certain uses or d: other conditions. Note: there are other, little used, marks with the words "Underwriters Laboratories" written out that also mean "Listed" Lee Schmitz Consultant ------------------------------------------- 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"
