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Richard Nute
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Do you have the specific wording? Do you have
something earlier than the CEE standards?
Thanks for your help!
Rich
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use any plastic.
Best regards,
Rich
Rich Nute wrote:
The choice is yours. If your product is supplied by a
Limited Power Source, then you may use any plastic for the
enclosure. If your product is not supplied by a Limited
Power Source, then you must use V1 or better
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Hi John:
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200202202227.oaa19...@epgc264.sdd.hp.com) about 'double-pole switching
and fusing', on Wed, 20 Feb 2002:
Tables 2E and 2F are invoked only by the Note 2
to Sub-clause 2.7.4.
A Note is informative
Here a a couple of documents you might find useful. They
were posted to LinkedIn. From Australia.
http://www.productsafety.gov.au/content/index.phtml/itemId/1003280
http://www.productsafety.gov.au/content/index.phtml/itemId/1003284
Enjoy!
Rich
-
9.6 Overcurrent protection
(no text)
9.6.1 General
(uses the word shall; not the word must)
9.6.2 Permanently connected equipment
9.6.3 Other equipment
In context of the Clause, the requirement of 9.6.3 is to
require the overcurrent device, if provided, be a part of
the equipment.
(Once it had
Hi Brian:
... they want to see complete list of organizations
and individuals that contributed to the errors that
caused a mandatory update to the standard.
Errors is an assumption made by the customer lawyers.
I would disagree that the mandatory updates were due to
errors.
Seldom do published
EMC Engineering is not something that is being taught in colleges
Electromagnetic Compatibility Laboratory
The Missouri ST Electromagnetic Compatibility (EMC) Laboratory supports
EMC research and education projects with a goal of developing the
knowledge base, tools and people necessary to
Hello Ian:
The first question is whether or not the fan is necessary
to meet the temperature requirements of the standard.
If yes, then the fan and its alternates must be tested to
prove that the end-product meets the temperature requirements.
A UL-certified fan should reduce the testing
-- but not much -- in the equipment.
Best wishes for the holiday season,
Richard Nute
Product Safety Consultant
Bend, Oregon, U.S.A.
On 12/16/2013 1:30 AM, McBurney, Ian wrote:
Hello Rich;
Can I suggest to the safety testing agency to disconnect or stall the
fan rotor for all testing? Would
Hi David:
Let me start my reply with some definitions:
Symbol 5019 means protective earth (ground). Its purpose is
to identify any terminal which is intended for connection to
an external conductor for protection against electric shock
in case of a fault... See IEC 60417. Usually, this is
Hi Doug:
A battery is never off. The best you can do is disconnect
it from the circuit. Whether or not the battery is disconnected,
if the separator is damaged, the resulting chemical reaction
will heat and produce gas which will cause the battery to swell.
(Some batteries have
Hi Dave:
On 1/5/2014 8:36 PM, Nyffenegger, Dave wrote:
So you are saying DIN GRN/YEL rail terminal block indicates bonding conductor
and it's OK to use this to connect functional earth to chassis even if there
are no other bonding conductors needed and connected to the DIN GRN/YEL
terminal
Hi Dave:
On 1/6/2014 6:34 AM, Nyffenegger, Dave wrote:
EN 60204-1:2006 3.45 defines protective conductor- conductor required for
protective bonding by some measures for protection against electric
shock for electrically connecting any of the following parts:
– exposed conductive parts;
–
Hi Scott:
The requirements for coin cell batteries in UL 60065 and UL 62368-1
were adopted in a voluntary standard to avoid the US Government
adopting a mandatory government standard. See
http://beta.congress.gov/bill/112th/senate-bill/1165
For UL, if an ITE product had a coin cell in a
Dear Ian:
You have entered a contest of wills.
The situation is not a contest of what is safe or
not safe.
The situation is not a contest of compliance to
the standard or not.
The test house, having taken a position, cannot
be argued into giving up its position without
losing face.
I advise
: Richard Nute [mailto:ri...@ieee.org]
Sent: 21 January 2014 19:26
To: McBurney, Ian; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Rear panel marking
Dear Ian:
You have entered a contest of wills.
The situation is not a contest of what is safe or not safe.
The situation is not a contest
750V DC Overhead Catenary Systems...
When I lived in the Barcelona area, the local rail system
used color TV (crt) monitors to provide the timetable. As
a train approached the station, the colors and then the
shape of the display would distort, getting worse as the
train got closer. Then, when
Here is the Emergency Stop symbol, IEC 60417-5638:
https://dl.dropboxusercontent.com/u/69937717/iec60417-5638.jpg
You can buy a label with the symbol from various
label suppliers.
Best regards,
Rich
-
This message is from
http://www.cs.ubc.ca/~hilpert/e/powerConn/index.html
-
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
Hi Brad:
The IEEE PSES (which runs this listserver) plans
awards and recognitions at its annual Symposia
(May 5-7 this year in San Jose).
The awards and recognitions contact person is:
Murlin Marks
murl...@ix.netcom.com
You can see this year's Symposium announcement at:
Hi Dave:
There are no standard definitions for critical
components. However, do a Google search for
critical components list and you will find a
number of examples and opinions as to a definition
of critical components. For example,
It is dismaying, but not unexpected, that the 'crackdown' includes a
body of fictitious 'requirements' generated in overheated local
imaginations and having nothing to do with the real new requirements.
Back in the days of the Nixon administration, this was known
as jawboning. Government
Hi Lauren:
You ask some questions whose answers cannot be short.
Transient overvoltages are normal in any power distribution
system. They arise mainly from two sources:
1) lightning;
2) switching equipment on and off.
Transient overvotages are either normal mode or common
mode. Normal mode
If you do a fault tree of the situation, you will
find that the situation meets all the criteria for
safety -- under normal conditions and under single
fault conditions.
I've used this pix as part of my presentations for
some time.
Rich
On 4/17/2014 10:35 AM, Ron Pickard RPQ wrote:
There
Announcing the 2014 IEEE NW Colloquium on Product Compliance:
Global Compliance: The New Frontier.
May 21, 2014
Shiley Hall
University of Portland
Portland, Oregon, USA
Sponsored by the Oregon and SW Washington Chapters of the
IEEE Product Safety Engineering and EMC Societies.
The Oregon and
Rich Nute Past, Present and Future
of Product Safety
11:30 -1pm
LUNCH
Vendor Presentations in
room 301
On 6/4/2014 9:47 AM, Mike Violette wrote:
Class B limits are amazingly conservative, to which large populations
of devices ascribe.
Try using an ordinary AM radio beside a compact fluorescent lamp
as on a beside table.
-
This
When I lived in Spain, we bought a new washing
machine. It had a multi-language manual with
the English buried towards the end. And, it
only used pictograms on the machine. The
pictograms were not understandable to us, and
they were not well-explained in the manual.
We had to experiment to
Hi Alex:
You can't pass the dielectric withstand test with
the varistor in place.
On the other hand, with the varistor in place, the
insulations supposedly won't see the transient
overvoltages, so there is no need to test whether or
not the insulations will withstand the transient
Hi Peter:
Since you will be doing flammability tests, see
5.1 of UL94 which has specifications for the fume
hood. Note that during the flammability test,
the hood is draft free while permitting normal
thermal circulation of air past the specimen.
Best regards,
Rich
-
On 6/24/2014 6:55 AM, Kunde, Brian wrote:
What does stressed only by d.c. mean? How are Mains Circuits stressed by
d.c.?
Hi Other Brian:
One must distinguish between ac mains and dc mains.
dc mains are not subject to the same overvoltages as
are ac mains. Therefore, dc mains are not as
On 6/24/2014 10:29 AM, Tyra, John wrote:
For IEC60065 Appendix N2.1 (informative) specifies a maximum production line
dielectric trip current limit of 100mA. This is considered a dielectric
failure and looked at as the same as breakdown or flashover.
Hi John:
IEC 60065 is dumb. A
Hi Joe:
As I mentioned in my original posting, I have seen
no peer-reviewed papers showing plug-strip or
equipment SPDs as preventing damage to equipment.
I see no benefit in such SPDs.
My responses are imbedded in your message.
On 6/23/2014 1:20 PM, Joe Randolph wrote:
1) The SPDs can be
Hi Joe:
4) Now consider the case where the ground pin on the mains plug is
left floating. This can happen when an uninformed customer uses a
cheater adapter to convert to a 2-pin mains outlet. In this
configuration the 3000 VRMS isolation barrier has 400V SPDs connected
directly across
Hi Joe:
I think that perhaps my frustration with the
SPD
allowances (at least for AC mains) has been due to my
misunderstanding of
the purpose of the 3000 VRMS requirement. I always thought that
this requirement was
Hi Brian:
You can expect the traditional (original) HP product
support from both Agilent and Keysight. Unlike the
current HP, Agilent and Keysight management are
from within and hold the traditional HP values.
Best regards,
Rich
-
Hi Doug:
The definition you quote would mean that all CD and DVD
drives would be subject to the MD? Fans in computers?
Best regards,
Rich
On 7/11/2014 12:00 PM, Douglas Nix wrote:
Carl, Paul, List members,
This is not gray at all. The assembly meets the fundamental definition
of
Hi Scott:
The product (which was certified to the version of the
standard that was in effect at the time) was tested by
a third-party laboratory (to a new requirement in the
current edition of the standard) and found non-compliant.
Somebody (either the laboratory or the authority) used
the
Dear Boštjan:
Despite UL1741 and UL 840, OVC does not apply to DC. There is
no research that I know of that supports use of AC OVC to DC.
If the 450 V DC is not outside the building or is otherwise not
subject to lightning-caused overvoltages, OVC does not apply.
Likewise, if the 450 V DC
Dear Boštjan:
If the solar cells are hit by lightning, then the DC and inverter
system will likely be destroyed, and the transient will propagate
into the AC system. There is no way to protect against a direct
lightning strike except to use a system of lightning rods, and
they may not provide
Hi Mike:
For a peak working voltage of 340 (240 rms), the routine test
(Table 5B) is 3000 V rms for 1 second between mains and ground.
(You do not have a peak working voltage exceeding 420 so Table
5B Part 2 does not apply.)
If you apply Table 5C, you must determine required withstand
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