Ted,
Thanks for sharing this case study/anecdote. Very interesting.
Regards,
Lauren Crane
Tokyo Electron
From: Ted Eckert <07cf6ebeab9d-dmarc-requ...@ieee.org>
Sent: Wednesday, January 02, 2019 11:06 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Red phosphorus flame retartants
This
All,
I received the following email from a customer today via their customer
addressing our application of surge testing. We are testing laboratory
equipment per IEC/EN 61326-1 and IEC/EN 61326-2-6 and specifically are
having failures with respect to surge on a system that has multiple
power
Should you be testing a 'system' as a whole anyway? My take on this is
that if several pieces of equipment are invoiced together with a single
price for the lot, that is a system and all must be tested together. But
if the pieces are invoiced separately (so that other equipment might be
This is an anecdote and not data, but I can speak of the reliability issue from
personal experience. I don’t remember exactly when this occurred, but it was
around 2005. A supplier of power cords was using red phosphorus as the flame
retardant in a plastic part for the IEC 60320-C13 connector
Hi Larry:
Are the failures do to actual damage, or just to upset?
I can imagine some situations where there might be upset for the
one-at-a-time configuration you describe, and I can understand how someone
might argue this configuration is not an appropriate test configuration.
However, I
IEC 61000-4-5 (2005) does cover this and implies in section 8.3 (page 38 in
my copy):
"In the case of several identical circuits, representative measurements
(plural) on a selected number
of circuits may be sufficient. "
and further down:
"When testing line to ground, the lines are tested singly
Hi Ted,
Many thanks for your sharing the anecdote! I am also aware of a case on
mains cord sets. It happened in 2014, 9 years after your case. Two major
PC suppliers: Hx and Lenxxx recalled abt 7m mains cord sets globally
(details are in CPSC website). It sounds not much lesson learnt.
I feel sure that
/"When testing line to ground, the lines are tested singly in sequence,
if there is no other/
/specification."/
is about 3-phase supplies, not multiple mains leads.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
I agree that it's an older paper, but the data are still relevant IMO.
Here are a few more recent ones from different US gov't organizations with
a pyrology focus (so not solely focused on Scott's original question, but
still informative):
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5445781/
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