PCB flammability rating marks are specifically required when "...found that flammability classifications of different grades of base materials (previously identified by one printed-wiring type designation) are different..."
I have never seen an "E4" flammability rating specified in UL94 or UL796. PCB marking requirements are found in UL796, clause 31, the CCN guide for 'ZPMV2', and the individual FUS file. And they are not always consistent. From: [email protected] [mailto:[email protected]]On Behalf Of Ted Eckert Sent: Friday, November 07, 2008 7:29 AM To: Kim Boll Jensen; [email protected] Subject: RE: UL flammability marking Strictly speaking, the flame rating does not need to be marked on the circuit board. The following is from the UL guide for category code ZPMV2 for Printed Wiring Boards. "Printed wiring boards Recognized under UL's Component Recognition Program are identified by significant markings consisting of the Recognized company's identification, the factory identification (if the printed wiring board is produced at more than one location), and the Recognized type designation that correspond with the marking specified in UL's published records. Only those components that actually bear the "Marking" shown in the individual Recognitions should be considered as being covered under the Component Recognition Program." As noted, the board must have the following items. 1. Company Identification; this can be a name or logo. 2. Recognized Type Identification; this is normally a code issued by the circuit board manufacturer. 3. Factory identification, if made at more than one factory. You will need to go to UL's on-line certification database. http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.h tm If you enter the category code ZPMV2, many pages of manufacturers will show up. I will take the first listing as an example, ZPMV2.E46545 for A & C Electronics. (They are only first alphabetically and I am in no way endorsing them as a vendor.) At the bottom of the page is listed the required marking for this vendor. It is their name or logo (and a picture of the logo is shown), type designation corresponding to the table displayed and factory marking. The flammability rating can only be determined >from the table in the file. The vendor may choose to mark the rating on the board, but it isn't required by UL. Ted Eckert Compliance Engineer Microsoft Corporation [email protected] From: Kim Boll Jensen [mailto:[email protected]] Sent: Friday, November 07, 2008 6:14 AM To: [email protected] Subject: UL flammability marking Hi all I have been told that the UL marking on PCB (UR 94V-0 etc.) can also be something like E4. Does anyone know if the marking requirements have been changed and if so where I can get more information. Best regards, Mr. Kim Boll Jensen Bolls Rådgivning Ved Gadekæret 11F DK-3660 Stenløse Denmark - 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
