Peter and Forum,
This discussion brings back some old memories for me. I worked at UL back in the 1970’s and shared a cubicle at that time with the engineer that developed the sharp edge tester. Peter’s comments pretty well summarizes the reasoning behind the development of the tester as a way to put more objectivity into the determination of whether or not an edge is too sharp. I can’t comment whether or not the tester fully achieved its goal and purpose but I do know that a lot of time and effort went in to its development. Good day, Richard I. Pittenger Agency Approval Engineer Food Retail Systems Hobart From: [email protected] [mailto:[email protected]] On Behalf Of peter merguerian Sent: Friday, February 12, 2010 12:30 AM To: [email protected]; sudhakar wasnik Cc: [email protected] Subject: Re: UL 1439 standard genesis Sudhakar, Many UL Standards call out "an edge, projection, or corner of an enclosure, opening, frame, guard, knob, handle, or the like, shall be smooth, well rounded, and not sufficiently sharp to constitute a hazard.” Manufacturers had no way to determine what constitutes a smooth, well rounded and not sufficiently sharp edge. UL developed the UL 1439 standard many years ago as a means to determine acceptability of a sharp edge. I believe today UL1439 is referenced in many of the UL standards. Best Regards, Peter Merguerian Go Global Compliance 4454 Crabapple Ct Tracy, CA 95377 Tel: (925) 487-4640 E-Mail: [email protected] --- On Thu, 2/11/10, sudhakar wasnik <[email protected]> wrote: From: sudhakar wasnik <[email protected]> Subject: UL 1439 standard genesis To: [email protected] Date: Thursday, February 11, 2010, 1:49 PM Hi Guys, Can some one in the group shade some light on origin of this UL 1439 sharp edge standard? Does this standard have any basic standard like ANSI or any other on which this standard has evolved or is this evolution was by itself? Thanks, Sudhakar Wasnik, - 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 <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/ <http://www.ieee-pses.org/> Instructions: http://listserv.ieee.org/request/user-guide.html <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 <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]> ________________________________ 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.
