You are allowed to draw current in a hipot test. In fact, you can even have
some arc over as long as current doesn't run away... so if there is arcing,
there could be carbon tracking which could lead to problems further on down
the line. I always assume excessive hipot testing is bad for the hardware but
I can't point to any studies showing this.
-Ken
On Wed, Jun 22, 2011 at 5:32 PM, Fred Townsend <ftowns...@sbcglobal.net> wrote:
Richard:
Here is my take. In hi-pot testing a stress voltage is applied but
virtually
no energy is absorbed so I would not expect any aging effects. The dielectric
is expected to continuously hold off the voltage applied. Therefore, one or a
hundred tests would be the same.
During a surge test energy is absorbed. Some surge absorbers,
particularly
MOVs do degrade. There is a noticeable heating effect which must be dissipated
or degradation is accelerated.
Regards,
Fred Townsend
DC to Light
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Richard
Pittenger
Sent: Wednesday, June 22, 2011 1:13 PM
To: emc-p...@ieee.org
Subject: Repeated Hi-Pot Testing - Destructive?
Hello Esteemed Group,
I have a question concerning repeated hi-pot testing in regard to
whether or
not it’s destructive.
Background: Some electrical components are hi-pot tested before they’re
shipped from their manufacturer. In the end-use manufacturing location, some
sub-assemblies may be subjected to hi-pot testing, usually as a means to
identify issues before the sub-assemblies are installed in the appliance.
Then, finally, many safety standards require a production-line hi-pot test
when the product is complete and ready to ship.
I’m looking for any information available which would help answer the
question of whether or not damage is done to the unit by multiple hi-pot
tests. Any comments from personal experience would also be welcome.
Thanks.
Regards,
Richard Pittenger
Agency Approval Engineer
Hobart Food Machines
________________________________
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://product-compliance.oc.ieee.org/
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 <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://product-compliance.oc.ieee.org/
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 <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://product-compliance.oc.ieee.org/
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 <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>
