Fred,
While MOVs tend to be messy and TSBs can short both of these devices can fail
in an open state as well. Or, the device shorts and a protection fuse may
open. At which time the transient device is open, protection it afforded is
gone and the equipment continues to operate. This is the
All,
I have noticed many IEC publications (in PDF) have a series of symbol
embedded in varying locations on every page. They consist of string of
punctuation marks. This sample string is somewhat randomized but it is
representative.
-``--`-`,,`,,,`,`,,`,`,,`--,,`-`,`,`,`,,`---
Is this
Ken,
Even though they may have a DC rating that exceeds the AC Peak of the line.
There are more factors.
Line rated caps also have surge ratings, typically in the kV range. Derek
mentioned the X an Y series and surge is one of the main attributes of this
type. I once had an RF engineer
Blazing Saddles
http://www.linkedin.com/in/dougp01
-
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
Personal opinion only...
Make the alternative bulbs economically competitive and dump the legislation.
--
Thanks, -doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On 8/24/12, Pearson, John john.pear...@polycom.com wrote:
Hi
Any opinions on this?
] Light Bulb provokquium
In message
CAByvTVPDdQ343GbF8=AxXZSgajd7cvH1Q=P2zp98Q+QHAD-=c...@mail.gmail.com,
dated Fri, 24 Aug 2012, Doug Powell doug...@gmail.com writes:
Make the alternative bulbs economically competitive and dump the
legislation.
Chicken and egg; the industry wouldn't have spend
Very true, all new inventions do cost more at first. That's why
investors were invented.
Now a few companies have learned how to get various legal entities to
mandate their products find a market.
-doug
On 8/24/12, Ken Javor ken.ja...@emccompliance.com wrote:
The EMC Compliance screen room
And the CE mark, what happens to it?
CE = Communauté Européenne
--
Thanks, -doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On 8/16/12, peter_kelle...@dell.com peter_kelle...@dell.com wrote:
EU = European Union
EC = European Community
The Treaty of Lisbon
[mailto:emc-p...@ieee.org]On Behalf Of Doug
Powell
Sent: Thursday, August 16, 2012 2:30 PM
To: peter_kelle...@dell.com
Cc: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] EC vs EU suffix
And the CE mark, what happens to it?
CE = Communauté Européenne
--
Thanks, -doug
Douglas E Powell
]
Sent: Thursday, August 16, 2012 2:44 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] EC vs EU suffix
Conformité Européenne
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Doug Powell
Sent: Thursday, August 16, 2012 2:30 PM
To: peter_kelle
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
know...)
More comments?
-doug
On 8/15/12, John Woodgate j...@jmwa.demon.co.uk wrote:
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
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On Jul 3, 2012, at 10:54 AM, Doug Powell doug...@gmail.comwrote:
Greetings all,
I would like someone to verify my thoughts in IEC 61010-1:2010 section
16.2 d) Ergonomics Aspects - arrangement of TERMINALS.
This clause
existing CB reports to see how CABs are interpreting this
mess
that is called 61010-1.
Brian
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Doug
Powell
Sent: Monday, July 30, 2012 7:59 AM
To: emc-p...@ieee.org; EMC-PSTC@listserv.ieee.org
Subject
] On Behalf Of Doug Powell
Sent: Monday, July 30, 2012 10:36 AM
To: Doug Nix
Cc: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Ergonomics Aspects - arrangement of TERMINALS in IEC
61010:2010
Brian and Doug,
Thanks for the reply.
My assertion is that 61010-1 section 16 is titled Hazards resulting
from
I'm curious,
Why is this paragraph added near the end of the section?
*If equipment conforming to IEC 60950 is used with equipment conforming to
this standard, and if there is a HAZARD due to moisture or liquids, the
instructions for use shall specify any additional precautions necessary.*
Monrad,
I am not aware of any need to save hard copy reports, especially after enough
time has elapsed. Document retention in the EU for liability directive is
still 10 years (you might double check that).
Otherwise, I have been doing electronic submittals (of safety reports) to my
Being as he said no interest in E-Fields, I imagine it's about human exposure
limits. And as always, it depends on where which jurisdiction is making
requirements.
Doug
Douglas E Powell
Compliance Engineering and Consulting
http://www.linkedin.com/in/dougp01
-Original Message-
From:
Greetings all,
I would like someone to verify my thoughts in IEC 61010-1:2010 section 16.2
d) Ergonomics Aspects - arrangement of TERMINALS.
This clause is a bit obscure (possibly incomplete) and to be honest makes
no sense in the ways I have seen it used so far. This new section 16 is
all
Brian,
NRTLs are under to oversight of OSHA, although I was not aware they would
do field surveys like this.
See: http://www.osha.gov/dts/otpca/nrtl/
--
Thanks, -doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On Tue, Jul 3, 2012 at 10:55 AM, Brian Oconnell
This is my Friday Question:
What exactly is the point of IEC 61010-1:2010 section 6.7.1.4?
It mentions requirements depend on factors in 6.7.1.1 a) to d), which by
the way is true for all insulation, then provides a four paragraph tutorial
on types of construction, electric strength, gaps,
Gert,
It would seem a motherboard is SELV circuitry and not subject to functional
spacings or a dielectric test. Or am I misunderstanding your application?
Doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
Sent from my Verizon Wireless BlackBerry
-Original
My question for today.
What is the typical test setup for radiated EMC measurements of general
purpose off the shelf switching power supply; is the resistor test load
tightly coupled to the output terminals of the PSU or is it on a long wire
and taken down the 80 cm of the table and out of the
a nominal voltage of 650/0.9 = 720 V.
Sounds like a letter to the Chair and Secretary of TC 66 is needed to
resolve this matter.
Regards
Mick
On 10/05/2012 00:27, Doug Powell wrote:
A change was made in 3rd Ed. for routine mains hipot tests while clamping
devices are still in the circuit
, 2012 12:00 PM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Cc:* Doug Powell
*Subject:* Re: [PSES] Hipot with in-circuit voltage limiting devices IEC
61010-1 3rd Ed.
Doug,
I wouldn't credit the TC 66 has having MOV component knowledge, just
perceptions.
Since my last message I have sent
The routine voltage test on mains is mandatory, but the method has options.
This is how I read the standard.
--
Thanks, -doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
On Thu, May 10, 2012 at 2:04 PM, John Woodgate j...@jmwa.demon.co.uk wrote:
In message
A change was made in 3rd Ed. for routine mains hipot tests while clamping
devices are still in the circuit; specifically clause F.3.2 (Ed. 3).
The standard states the test can be carried out at 0.9 times the
clamping voltage of the device and not less than twice the working
voltage. Edition 2
I set up a gmail account and went through the steps to buy a couple
standards. The site seems to have a functioning shopping cart software and
the privacy report says they are using
https://payment_fashionpay_com/sslpayment as their shopping cart software.
A quick InterNIC check of
All,
I am seeking information on availability of a test lab, qualified to do CEC
efficiency testing (Sandia protocol) for Solar PV with power capability of
up to 500 kW. Preference is an accredited lab able to write a letter
of attestation. Location is only of secondary concern.
--
Thanks,
The in the acoustics section 12.5 of 61010-1 are the concepts of operator
and bystander positions. The standard clearly states dimensions for the
test room, yet it does not clearly state what distances are for
personnel. Let's assume a control panel is mounted in a rack system, at
eye-level, and
the floor.
The Other Brian
*From:* emc-p...@ieee.org [mailto:emc-p...@ieee.org] *On Behalf Of *Doug
Powell
*Sent:* Wednesday, April 25, 2012 12:47 PM
*To:* emc-pstc
*Subject:* IEC/EN 61010-1
The in the acoustics section 12.5 of 61010-1 are the concepts of operator
and bystander positions
I'm afraid these old solutions will not work for long.
The new trend is all about the next level in tracking your browsing habits
and targeted advertising. ALL web browsers are susceptible, that is if you
want to keep modicum of functionality on the web these days. The list of
susceptible
I think there is some variance in standards for green/yellow colors.
I believe IEC 60204-1 has some guidance on the actual color mix, also standards
for HAR wire should have this. The rule I have seen is for more than just a
trace of color. Nominally the green/yellow mix should be 50%/50%.
The man who taught me compliance said internal wires could be any color. This
was back in the days of VDE 0160. And my certs went through LGA Nurnberg
The exception was of course the ground circuit. There was strong direction to
avoid confusion with DC circuits, especially the Red for
I received many replies, public and private, and many people have assisted
me, thank you!
In particular, Gert Gremmen in The Netherlands was able to create a trouble
ticket on the CENELEC web site and here is the response. I for one, will
be flagging my shortcut to CENELEC with their expected
For many years I have consistently seen broken web pages and defective
search screens at CENELEC. Just today I tried again and several of their
pages say:
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance
downtime or capacity problems.
Excellent advice Rich.
I am a proponent of “design for compliance” and have been for years.
Getting involved early solves more than you can possibly know; if possible
do it at the napkin design stage. Here is a list of ideas
that immediately come to mind, there's probably much more.
1)
These voltages, and more, all exist today. It depends on the system to which
you are connected.
The 110 is from a 220 split phase feed. Often this is from of a secondary of a
delta connected transformer. Normally 120v is derived from a 208v three phase
wye system. It is from one of the
I realize this is not an authoritive page with regard to codes and
standards but it has a good synopsis of the grid and power
distribution.
http://en.wikipedia.org/wiki/Electric_power_distribution
Check the graphic on General layout of electricity networks
-doug
Douglas E Powell
All,
It seems there is a change in 61010-1 regarding the exclusive use to
green / yellow color coded parts. In the past these colors were
reserved solely for the use of the protective conductor, and
protective bonding devices. This is generally true of safety
standards based in or harminozed to
To my knowledge there is no internationally accepted symbol specifically for
this. However, the ! symbol in a triangle directs the user to refer to
documentation before installing/using. In the user documents is where you
would detail this info in the language of the region.
Doug
Douglas E
Hi all,
Is there a particular U.S. Military standard which could be considered an
approximate equivalent to IEC 61010-1?
Sometimes military and commercial standards do parallel in some ways.
Thanks!
Doug
Sent from my Verizon Wireless BlackBerry
-
This discussion has become interesting.
Possibly ratings are common knowledge and possibly not. I'm sure everyone has
an awareness of ratings, but do they have an understanding? And if they don't,
do ratings serve any purpose for the end user?
I suggest most people understand they must
This discovery has a lot of potential. A self-monitoring battery could easily
signal for help or open an interlock. If caught early enough, a thermal
runaway might be averted. This could be especially important on large devices
like electric vehicles or charge controllers.
The numbers are down somewhat. I seem to recall the late 1990s we were about
800 strong.
Doug
Douglas E Powell
doug...@gmail.com
http://www.linkedin.com/in/dougp01
Sent from my Verizon Wireless BlackBerry
-Original Message-
From: Scott Douglas emcp...@radiusnorth.net
Date:
of the
economy?
Ed Price
El Cajon, CA
USA
-Original Message-
From: Doug Powell [mailto:doug...@gmail.com]
Sent: Monday, January 16, 2012 6:58 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] EMC-PSTC Email List Subscriber Status as of January 4,
2012
The numbers are down
Sharepoint is a good solution, so long as the servers on the back-end have a
robust backup system. In the last couple of years I went through some
difficulty in proving this was true for my ISO 17025 lab certification efforts.
The problem I found was the I.T. department policies, or rather
All,
With some folks retiring and others I know are changing careers (recently
termed “retooling”), I had some pensive thoughts about losing many folks who
are experts in the field or those with great wisdom. So it occurs to me, I
would like to hear your favorite quotes on Wisdom and
. And don't forget to correct your readings for this.
It may seem counter intuitive, but using a small value pad and then turning on
the preamp has worked well for me.
All the best in the New Year,
Doug Powell
Sent with Xobni Mobile - http://xobni.com/mobile
Sent from my Verizon Wireless
level. 0 Hz - 30 MHz
Doug Powell
Sent from my Verizon Wireless BlackBerry
-Original Message-
From: doug...@gmail.com
Date: Tue, 27 Dec 2011 16:47:18
To: Grace Lingraceli...@gmail.com; EMC-PSTC@LISTSERV.IEEE.ORG
Reply-To: doug...@gmail.com
Subject: Re: [PSES] Protect An EMI Receiver
contractors and operating
these devices while under load can cause huge inductive spikes on the LISN.
- Doug Powell
Sent from my Verizon Wireless BlackBerry
-Original Message-
From: Ken Javor ken.ja...@emccompliance.com
Date: Tue, 27 Dec 2011 12:03:23
To: EMC-PSTC@LISTSERV.IEEE.ORG
The CISPR 16, 5 uH LISN.
Doug Powell
Sent from my Verizon Wireless BlackBerry
-Original Message-
From: Ken Javor ken.ja...@emccompliance.com
Date: Tue, 27 Dec 2011 13:40:13
To: EMC-PSTC@LISTSERV.IEEE.ORG
Reply-To: Ken Javor ken.ja...@emccompliance.com
Subject: Re: [PSES
John,
In my company, I often run into this problem and a non-contact or infrared
thermometer is not always pratical. Like you, I also had to resort to
momentary turn off to get accurate readings. In one instance, I had magentic
fields strong enough to cause damage to the instrument. There
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