The NRTL assessment engineer must provide specific requirements via normative clauses of the scoped standard, or a formal corporate policy that has been published. If this person will not or cannot, immediately contact the agency's technical authority for the scope of your equipment. The OSHA NRTL program does allow a certain latitude per 'engineering judgment'.
The material shall be rated for your intended use and conditions of acceptability. Creepage and Clearance are defined and specified in all ANSI safety standards. I will address these type of agency issues at the PSES symposium. Brian -----Original Message----- From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Richard Pittenger Sent: Friday, November 02, 2012 11:21 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: VTM-2 Rated Film - Proper Electrical Barrier Esteemed Colleagues, I have a product submitted to NRTL "E" that uses a Mylar electrical barrier between line-voltage (120 V ac), uninsulated live parts on a circuit board and the aluminum electrical enclosure. The 'through-air' spacing would be a little short without this barrier in place. The barrier material has a UL 94 VTM-2 flame rating and has been accepted in other similar products for many years in similar applications by NRTL "U". NRTL "E" is objecting to use of this material for this application but so far has not provided a reason. Can any of you think of a reason why a plastic film with a VTM-2 flame rating shouldn't be used as an electrical barrier? Thanks for any and all comments. Regards, Richard Pittenger Agency Approval Engineer Food Machines Engineering Hobart/Berkel Disclaimer - This email and any files transmitted with it are confidential and contain privileged or copyrighted information. You must not present this message to another party without first gaining permission from the sender. If you are not the intended recipient, you must not copy, print, distribute or use this email or the information contained in it for any purpose other than to notify us. If you received this email in error, please notify the sender immediately and delete this email from your system. We do not guarantee that this email is free from viruses or any other defects although due care has been taken to minimize the risk. - ---------------------------------------------------------------- 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> - ---------------------------------------------------------------- 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>
