Some UL and CSA standards spec up to min 3mm of ceramic material for use as insulation from haz V. And some safety stds have no min thikness for ceramic stuff. And you can infer from temperature tables in various standards that ceramics can be considered supp or rein insulation. But I am not certain if feasible to very closely sinter ceramic over large al surface.
What about covering inside of enclosure with stuff like ceramic/mica or valox or lexan sheets? Ceramic weave tapes? Alumina potting spooge? Peanut butter? No more ideas. Brian -----Original Message----- From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Brian Ceresney Sent: Tuesday, July 17, 2012 4:59 PM To: IBM Ken Cc: EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: Insulative barriers deposited on metal surfaces The standards we are typically working with are UL1564, CSA 107.2, and UL2202, however many of the older North American standards have comparatively large distances between live parts and enclosure. These locations are specifically not allowed the easements found in UL840, and instead, the distances must be met, or barriers may be used. Regards, Brian C. From: IBM Ken [mailto:ibm...@gmail.com] Sent: Tuesday, July 17, 2012 4:50 PM To: Brian Ceresney Cc: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: Insulative barriers deposited on metal surfaces It might be helpful for the discussion to know the Standard that applies to the component you are certifying. -Ken On Tue, Jul 17, 2012 at 6:03 PM, Brian Ceresney <bceres...@delta-q.com> wrote: Hello Compliance Experts, I'm interested in the use of a high temperature insulator, possibly a ceramic, which would be deposited inside a cast aluminum electrical enclosure. The aim would be to be able to have the product pass safety approvals using this layer as a barrier against electric shock. This layer would help to reduce the large distances required from live parts to conductive enclosure, especially in North America. I'm aware of a variety of processes which can provide electrical isolation, but I haven't seen them used in products having safety approvals. The people who own these processes don't seem to be interested in using them as insulation in products. Has anyone seen this type of approach used successfully, or had success in a similar situation? Any pros or cons you can pass along? Thanks in advance for your consideration. Best Regards, Brian C. Brian Ceresney, CTech. Regulatory Team Lead, Delta-Q Technologies Corp. 3755 Willingdon Ave., Burnaby, BC Canada V5G 3H3 Tel: 604-566-8827 www.delta-q.com bceres...@delta-q.com - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
