Hi, Jim. The short answer is no, the UL tape reports don't (or didn't) look at the 'suitability' of the adhesive. Part of the reason for this is that it's substrate dependent. That appears to be left to the tape manufacturers.
FWIW, here's some blather about adhesives. There's a test specification in Subclause 4.6.5 of the 60950-1 standards for the application you mention in your second paragraph. This has been in the IEC 950 and derivative versions of the standard for something over 12 years. UL and CSA do have product categories for adhesive systems. UL's CCN is QOQW2 (I don't have the CSA class at hand). This type of evaluation has been in Annex P.2 of the CSA/UL implementation of the 950 based standards (being period correct, here: no 60 prefix) since about 1995 and possibly longer. You may also be interested in the sixth dashed paragraph of Subclause 4.7.3.4 of the same (note that the adhesive isn't considered in the flammability evaluation this exception is written against). 108/135/FDIS for IEC60950-1, 2nd ed, includes a reference to spiral wrapped winding wire in discussing cemented joints (Subclause 2.10.5.5, Note 2, second dashed paragraph). Regards, Peter L. Tarver, PE ptar...@ieee.org > From: Jim Eichner > Sent: Monday, April 17, 2006 3:55 PM > > The question of approval of the adhesive is a good one. I've wondered > about that too. When we use typical transformer tapes like the > ubiquitous 3M#56, the adhesive is largely used only temporarily, since > the next layer or winding will hold it in place. Even for the outerwrap > you could argue that the adhesive is backed up by a second means, albeit > varnish, so two things would have to fail for the tape to unwind. > > BUT...suppose we want to use that same tape on a piece of sheet metal > where a live part is too close and fails clearance. We are relying on > the adhesive for a safety function. The tape has the UR mark but has > the adhesive been tested for long-term adhesion? Is there any way to > know without asking the manufacturer for a look at the Conditions of > Acceptability in the UL report? > > Jim Eichner, P.Eng. > Compliance Engineering Manager > Xantrex Technology Inc. > e-mail: jim.eich...@xantrex.com > web: www.xantrex.com > _____________________________________________________________________________ Scanned by Sanmina-SCI eShield _______ _____________________________________________________________________ - 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 emc-p...@ieee.org 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 emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
