Group:
I had a project engineer ask me if I could suggest any vendors for a modular
power supply for his project. I say project, because it's a ground-portable
box that does something or other which he didn't think I needed to know
about.
All I know is that he expects to put about 1kW of 208V,
I recently designed a piece of in-house gear that uses the PCB as part of
the protective earth GND return. At first I thought I would be forced to use
a wire(s) only (which was awkward given the mechanics of the unit) but then
was convinced that EN61010 did not require it. To get around the via
Talking modest power levels 1kW AC input here:
PC mounted IEC inlets have been available for some time with excellent
strength and isolation performance. We like the PC mount arrangement because
it avoids the prep and assembly work required for discrete wire termination of
the L and N
Group,
Sweden's Ordinance on Producer Responsibility for waste from electronic
equipment has been in effect since July 1, 2001. The requirements are not
the same as the upcoming European Union WEEE Directive. I have several
questions for the group.
Why do you think the Swedish requirements
There are a number of potential issues - Watch out for the IP rating though
– 950 does not consider Pollution Degree IV and if your 950 part is not
protected to Pollution Degree II or III them the Creepage Clearance distance
WILL be inadequate.
Best regards
Gregg
From:
I read in !emc-pstc that Ted Rook t...@crestaudio.com wrote (in
se3f8562@peavey.com) about '50Hz remark' on Tue, 4 Feb 2003:
I'm referring to the basic frequency difference only,
OK, I thought maybe there was more.
--
Regards, John Woodgate, OOO - Own Opinions Only.
I read in !emc-pstc that John Roche john_ro...@compuserve.com wrote
(in 200302041134_mc3-1-2829-4...@compuserve.com) about 'CE marking and
additional information requirements' on Tue, 4 Feb 2003:
The raison d'etre for the CE Marking scheme is to inform the end-user that
the product meets the
I read in !emc-pstc that drcuthbert drcuthb...@micron.com wrote (in
cfefa50c9bcad21197470001fa7eba6b14121...@ntexchange05.micron.com)
about 'EN60950 protective conductor test (was Re: Circuit Breaker Tr
ipping Dring Fault Tests)' on Tue, 4 Feb 2003:
The results would then
be published in
Then you haven't dealt with agilent (no caps on purpose) lately. Ask them if
they can spell the other company's name.
I have been through similar hoops as of late, and they couldn't spell RS.
Regards,
JOHN E. STUCKEY
From: emcp...@aol.com [mailto:emcp...@aol.com]
Sent: Tuesday,
Tim, which amendments or revisions of the test equipment standards or product
test standards do you believe are not supported?
Richard Woods
Sensormatic Electronics
Tyco International
From: emcp...@aol.com [mailto:emcp...@aol.com]
Sent: Tuesday, February 04, 2003 1:00 PM
To:
We once had a UL508 panel where the Listed construction allowed us to
install a specified UL 60950 Listed ITE device into the panel at the
customer site. So, it can be done. In our particular case, UL was the
Listing agency.
Richard Woods
Sensormatic Electronics
Tyco International
From:
Sources for test probes equipment:
You ought to look at www.ergonomicsusa.com check out their
offerings...
br, Pete
Peter E Perkins, PE
Principal Product Safety Consultant
Tigard, ORe 97281-3427
503/452-1201 fone/fax
p.perk...@ieee.org
This message is from
Lou,
I'm not proposing anything mind you, but you could save some space if
you had
a PWB mounted appliance inlet and you would still have to get the PEC to the
chassis.
Gary
From: Lou Aiken [mailto:ai...@gulftel.com]
Sent: Tuesday, February 04, 2003 8:36 AM
To: Peter
PC traces are easier to assemble and the assembly can be done in a tighter
space. I think (just an opinion) that proper design could make this type of
system more reliable as well with less chances of wires coming loose...
-Original Message-
From: Lou Aiken [SMTP:ai...@gulftel.com]
I think all of the people that own the Agilent 6842A Harmonic and Flicker Test
System should get together and request Agilent to update their software for
the new standards. As a loyal HP/Agilent customer, I would expect them to
take care of this issue. This is why we buy certain brands of test
-Original Message-
From: Duncan Hobbs [mailto:duncan_ho...@xyratex.com]
Sent: Tuesday, February 04, 2003 7:51 AM
To: emc-p...@majordomo.ieee.org
Subject: Multi - Lingual Markings For Industrial Equipment in the U.S.
Group,
Does anyone know if there are any state or federal
Pierre,
I have seen many INDUSTRAIL TYPE computers Listed under UL's category for
Information Technology Equipment (NWGQ) - ITE. Therefore, I am assuming that
such UL1950 or UL60950 equipment can be used in UL508 products.
Peter
Pierre SELVA e.l...@wanadoo.fr wrote:
Hello from
Chris,
Douglas Brooks wrote an article about Preese's and Onderdonk's equations
for fusing currents of wires, which was published in Printed Circuit
Magazine. It can be downloaded from UltraCAD's web site at
http://www.ultracad.com/fusing.pdf
Appendix F of the book that I am writing for
I read in !emc-pstc that Pierre SELVA e.l...@wanadoo.fr wrote (in
3e26daa600ad0...@mel-rta10.wanadoo.fr) about 'UL508 and UL60950' on
Tue, 4 Feb 2003:
One of my customer is providing Human Machine Interfaces (Industrial
programmable controllers, Displays, ...).
Most of these products are
Lou Aiken wrote
... what practical reasons there are for using PC traces to provide
earth fault circuits.
One practical reason is, to cut costs and simplify construction. Some years
ago a former employer designed and made a computer power supply with the
safety ground on the board, and UL
I read in !emc-pstc that Neil Helsby nei...@solid-state-logic.com
wrote (in 20030204.8161...@mis.configured.host) about 'CE marking and
additional information requirements' on Tue, 4 Feb 2003:
The CE marking must be affixed to the apparatus or data plate. Where
this is not possible or not
I read in !emc-pstc that Chris Maxwell chris.maxw...@nettest.com wrote
(in 83d652574e7af740873674f9fc12dbaaf7e...@utexh1w2.gnnettest.com)
about 'EN60950 protective conductor test (was Re: Circuit Breaker
Tripping Dring Fault Tests)' on Tue, 4 Feb 2003:
This would make heat dissipation different;
Why not provide a fuse to prevent deterioration of the PE trace on a PCB?
Joking of course, but now that I have your attention, I would like to see
this thread move away from the physics and discuss what practical reasons
there are for using PC traces to provide earth fault circuits.
Lou
Richard
In practice we see the CE Mark itself displayed in a variety of different
ways; on its own, as part of a label, not on the label at all, not on the
product at all (but on the packaging or in the User Manual). All seem quite
acceptable and legal.
The raison d'etre for the CE Marking
Pierre,
Industrial computer systems are not covered by UL60950, they are covered by
UL508. So, I believe that your system (PLC, computer, etc.) needs to be
evaluated to the requirements of UL508.
John Radomski
Schneider Electric
Group,
Does anyone know if there are any state or federal regulations
that may require bilingual markings for certain regions in the USA? I am
thinking of certain states where Spanish is a widely used language.
The equipment is industrial test equipment, of the sort that would be
Not quite. I^2·t will tell you the let through current of
the copper trace, but will not necessarily tell you if the
construction will be compliant. The compliance criteria for
this test include:
* no damage to the trace (no lifting, probably no
discoloration)
* no damage to
John,
I'm referring to the basic frequency difference only, and the remark was
targeted to others in industries like ours, based in the land of 60Hz and
exporting into 50Hz territory.
Because stuff works on 60Hz, and linear transformers can take care of the
nominal voltage difference between 120
Chris,
I have estimated this type of thing in the past assuming adiabatic
conditions. That is, the energy put into the material heats it and no energy
is lost during the heating. This gives the worse-case temperature rise. So,
what is needed is the electrical resistance of the material and the
Exactly! There is lots of data and tables available on the web for steady
state current; but I haven't found any sources that would give the (I^2)(t)
values for wires or PCB traces. Such tables would take a great deal of
mystery out of this subject. Right now, the best guess is to go by
Hello from France,
One of my customer is providing Human Machine Interfaces (Industrial
programmable controllers, Displays, ...).
Most of these products are included in UL508 certified complete products, and
are themselves UL508 certified.
But, can we use UL60950 certified products in a
I read in !emc-pstc that emcp...@aol.com wrote (in 144.9826c5b.2b70a07e
@aol.com) about 'Harmonic flicker questions' on Mon, 3 Feb 2003:
I have some questions about the harmonic/flicker standards. I would
appreciate any input you have.
1. What are the differences between EN
Hi Folks
I am surprised that people are still having trouble with Form 740 and
related documents - these have been around for years in one form or another!
We were routinely doing these forms 15 years ago (and they had been around a
long time before that) when I worked for HP at Bristol in the
I read in !emc-pstc that Dave Wilson davewilson...@yahoo.com wrote (in
20030203224912.58722.qm...@web20004.mail.yahoo.com) about 'Marking of
packaging material' on Mon, 3 Feb 2003:
Can anyone point me to the tables in the annex of Decision 97/129,
the ID system for packaging covered by
To quote:
The CE marking must be affixed to the apparatus or data plate. Where
this is not possible or not warranted on account of the nature of that
apparatus, it must be affixed to the packaging, if any, and to the
accompanying documents.
Regards,
Neil Helsby
Hi All,
I have posted this month's Technical Tidbit, Crossing Ground Plane
Breaks - Part 3, Immunity to Radiated EMI. It is at http://emcesd.com
with the link being the picture at the bottom of the index page.
In the article, the last in a three part series on the effects of
paths crossing
Hello Group,
I have some questions about the harmonic/flicker standards. I would
appreciate any input you have.
1. What are the differences between EN 61000-3-2:1995 plus A1:1998, A2:1998,
A14:2000 and the new standard EN 61000-3-2:2000?
2. What are the differences between EN 61000-3-3:1995
Andre,
I think that in section 1.7.12 (the section you referenced in the
60950 family) there is also a provision that for service personnel, the
language on safety related info can be English. (except in Germany,
where it must also be in German). I would take this to mean that
component
38 matches
Mail list logo
