In message <A144CDCEB987491A84EA585AF964D205@lashko>, dated Fri, 8 Mar
2013, =?iso-8859-1?Q?H. K=F6ster?= <[email protected]> writes:
But in 7.2 is also mentioned that for such products the test shall be
done in a similar way as for grounded products but without adding any
additional
external grounded
connections.
That is completely consistent with the following sentence, which is what
I quoted.
And that is physically correct as I think. Also without PE connection
of the product itself the common mode surge tests with 2kV will stress
the L to N input of the product with more than the 1kV of the
differential test. And exactly this happened and damaged the power
supply.
Which common-mode surge tests do you mean? The phrase 'common-mode'
isn't in the standard, and I would expect a common mode test to be
applied between (L and N connected together) and earth, so the L-N path
wouldn't be stressed at all.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
SHOCK HORROR! Dinosaur-like DNA found in chicken and turkey meals
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-
----------------------------------------------------------------
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.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 <[email protected]>
Mike Cantwell <[email protected]>
For policy questions, send mail to:
Jim Bacher: <[email protected]>
David Heald: <[email protected]>
