Dear List Members, Thanks for all of the replies on this subject. There are some very knowledgeable people in this forum. Unfortunately for us, the NRTL is folding under pressure and will now require the heat sink to be grounded. :o( Due to the design of this special custom heat sink, grounding it will be very difficult. Thanks again for sharing your knowledge and experience! Regards, Christine Rodham
--- On Sat, 5/16/09, Ted Eckert <[email protected]> wrote: From: Ted Eckert <[email protected]> Subject: RE: NRTL Mark vs. NEC Inspector To: "[email protected]" <[email protected]> Date: Saturday, May 16, 2009, 6:10 AM Rich is largely correct on this and I must admit my error. I dug into UL 62, Flexible Cords and Cables, to get the details. There are limited electrical tests for the outer jacket. The testing for the jacket appears to be primarily concerned with mechanical protection. The outer jacket may also carry a flame rating. However, it generally isn’t tested on its own for insulation strength. Some cords types are required to pass electrical tests on the finished cord, but only the spark test in section 5.2.1 will be significantly affected by the outer jacket. UL 62 will help you determine the insulation thickness on the inner conductors to determine if they are at least 0.4 mm thick. Ted Eckert Compliance Engineer Microsoft Corporation [email protected] The opinions expressed are my own and do not necessarily reflect those of my employer. From: Richard Nute [mailto:[email protected]] Sent: Saturday, May 16, 2009 12:02 AM To: [email protected] Subject: Re: NRTL Mark vs. NEC Inspector > Depending on the cord type, a jacketed cord will typically have two layers of > insulation. If I recall correctly, in the US and Canada, the jacket is for mechanical protection of the conductors, and is not tested for its insulation properties. Best regards, Rich - ---------------------------------------------------------------- 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
