I have used the tester and find it takes a pretty sharp edge to fail. The
primary benefit of the tester is that it settles the argument. If an edge
passes the test UL will accept it. If it fails you had better address the
issue. Internally, I have judged some edges a hazard and insisted on
improvements even knowing they would pass. Most engineers are unaware of the
tester and will follow the direction of the product safety engineer. As with a
lot of product safety situations, good judgement on the part of the product
safety engineer is important in spite of the wording in the standard.
Bob Johnson
Richard Pittenger wrote:
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]>
<mailto:[email protected]> wrote:
From: sudhakar wasnik <[email protected]>
<mailto:[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.
-
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]>
