This is a another example of risks taken to limits beyond the
considerations in the standard tests. The standard is not intended to
contain design rules for every risk, but does a good job of addressing
the common ones. If you are using IEC 60950, then careful application of
chapter 0 is
On 19 Aug 2012, at 21:37, Bob Johnson wrote:
This is why the safety of a product needs to be addressed by a product safety
engineer, not an auditor. After careful review of the hazards and conditions
of use, you may end up with a design with either tighter or looser
constraints than the
And also in 950 with the cheesecloth, tissue paper, and wood.
On Wed, Aug 15, 2012 at 3:20 PM, Doug Powell doug...@gmail.com wrote:
Conversely, it seems possible to use a standardized ignitable
material to evaluate ignition sources. And this has been done to some
extent in IEC 610101-1
[mailto:emc-p...@ieee.org] Namens IBM Ken
Verzonden: Thursday, August 16, 2012 8:41 AM
Aan: Doug Powell
CC: John Woodgate; EMC-PSTC@LISTSERV.IEEE.ORG
Onderwerp: Re: [PSES] Ignition sources and exposure time
And also in 950 with the cheesecloth, tissue paper, and wood.
On Wed, Aug 15, 2012 at 3:20
Maybe I should have saved this for a Friday question, but here goes.
This is a general question regarding ignition sources and exposure time.
In reviewing the flammability (UL 94) tests and the hot wire ignition
(UL 746) tests, it seems 30 seconds is the magic number for igniting
the sample
In message
cabyvtvny1rjvr5g8moofwhm43wpbooszi0yrefkimxx6dvg...@mail.gmail.com,
dated Wed, 15 Aug 2012, Doug Powell doug...@gmail.com writes:
For example the UL 94 test is a 30 second exposure to a 50W flame.
Would a 15 second 100W flame be equivalent?
Sometimes, sometimes not. It depends on what
John,
Your point is well taken.
As a child, I recall running my fingers through a candle flame. If
you move fast enough, you do not absorb feel the heat of the flame.
So it seems to me that the true definition of ignition would be
something like a cirmstance where a source of ignition is
In message
cabyvtvpognmxg2gsa+zsmpmnncirfwzn+x9yaqwxvotonj6...@mail.gmail.com,
dated Wed, 15 Aug 2012, Doug Powell doug...@gmail.com writes:
In the end, I suppose my question could be phrased, Aside from the
rapid and devastating mechanical effects of an explosion, is it
possible or even
From: Doug Powell [mailto:doug...@gmail.com]
Sent: Wednesday, August 15, 2012 12:20
John,
Your point is well taken.
As a child, I recall running my fingers through a
candle flame. If
you move fast enough, you do not absorb feel the heat
of the flame.
In a similar vein to this, Rich
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