Hi Rich,
I agree on the difficulty of foreseeing everything customers do. However many
warnings such as the ones I mentioned have, I believe, originated from reports
of what customers have actually done.
Cheers,
Gary Tornquist
Opinions are mine, not of Microsoft Corp.
From: Richard Nute
I’m sure you’ve all seen the video of the guy trimming his hedge bushes by
spinning a chainsaw on the end of a rope around in a circle☺
-Dave
From: Gary Tornquist [mailto:gary...@microsoft.com]
Sent: Thursday, March 05, 2015 2:49 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Signal
… many warnings such as the ones I mentioned have, I believe, originated from
reports of what customers have actually done…
Warnings invoke a specific behavior on the part of someone. Where misuse is
foreseeable, a warning can be an effective safeguard.
Discarding a battery (in an
In message 006501d05794$dc6afdc0$9540f940$@ieee.org, dated Thu, 5 Mar
2015, Richard Nute ri...@ieee.org writes:
For every product, there is a development team.
The product safety engineer is a member of that
team, overtly or not, and owns the safety of the product.
Far too often, it isn't
... the management of the company has to own
the safety of the product. They control the
resources
needed to ensure that the products are designed,
and
manufactured to be safe.
Cop-out.
For every product, there is a development team.
The product safety engineer is a member of that
team,
I tend to disagree.
For example, for a company who uses contract manufacturing, the Supply,
Quality, and Manufacturing teams have a significant amount of responsibility
for Safety, which can be quite separate from the Design team.
The management must keep good control over all of the groups
That is why there must be a committed teamwork of the.compliance engineer,
designers, testers and management at all levels to ensure compliant products.
If one or more diverts from that for whatever the reason, failure is usually
the outcome.
Please note that I said compliance
A German acquaintance of mine calls them EMC vitamins.
Best regards,
Ron Pickard
-Original Message-
From: Bob LaFrance [mailto:b...@creare.com]
Sent: Thursday, March 05, 2015 7:09 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Ferrite Cores on cables and possible reduction
I
Process Control; that is, the construction prints and BoM are controlled
documents, and any deviations are subject to a formal change order where the
senior regulatory person is final signatory. Makes some people rather unhappy,
but seems to work for my employer. The downside is the significant
Yes, it has to be connected, add requirements in installation instructions.
Best regards,
Bostjan
Boštjan Glavič
Vodja laboratorija, Laboratorij za elektroniko
Head of Laboratory, Laboratory of Electronic Engineering
[SIQlogo60px]
www.siq.sihttp://www.siq.si/
SIQ Ljubljana, Trzaska c. 2,
Hi Chris,
For permanently connected equipment or pluggable equipment type B or pluggable
equipment type A with additional PE conductor for permanent connection you do
not need a GDT in series to varistor. You can directly connect varistor primary
to PE.
For pluggable equipment type A you
A colleague who is more knowledgeable than I am has noted that I did not
include the relevant information from IEC 60950-1 2nd Edition Amendment 2. The
amendment includes the following.
For all other equipment, it is permitted to bridge BASIC INSULATION by a VDR in
series with a GDT provided
In message 004601d05771$4eec3bd0$ecc4b370$@ieee.org, dated Thu, 5 Mar
2015, Richard Nute ri...@ieee.org writes:
In the organization, who owns the safety of the
product?
I don't know about 'owns', but safety must be designed in (I doubt that
we disagree on that), and the designers are
That depends on how it's managed/responsibilities assigned within the
organization.
-Dave
-Original Message-
From: Richard Nute [mailto:ri...@ieee.org]
Sent: Thursday, March 05, 2015 1:22 PM
To: Nyffenegger, Dave
Cc: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] Safety standards
If the product safety engineer does his job,
there will
be no test
failures.
But between the first model assessment and the
final
'pass' there will be costly design changes and
disputes
between the safety experts and the designers.
That can't
be good.
If the product safety engineer does
You can lead a horse to water.
Sometimes the same thing can be said about design engineers.
All depends on the level of authorities and how it's managed within the
organization.
-Dave
-Original Message-
From: Richard Nute [mailto:ri...@ieee.org]
Sent: Thursday, March 05, 2015
All depends on the level of authorities and how
it's
managed within the organization.
In the organization, who owns the safety of the
product?
Best regards,
Rich
-
This message is from the IEEE Product Safety Engineering
Hi Gary:
What about warning the customer against foreseeable misuse of the product that
might be hazardous? I’ve seen the signal words used for instance where the
warnings says something like “Do not dispose of the battery by incineration”
I don’t define “misuse” as failure to
IMHO, the management of the company has to own the safety of the product.
They control the resources needed to ensure that the products are designed, and
manufactured to be safe.
Best Regards,
Brian C .
-Original Message-
From: Nyffenegger, Dave [mailto:dave.nyffeneg...@bhemail.com]
On 3/3/2015 12:38 PM, Grasso, Charles wrote:
It is generally reported (at least as far as I can remember) that a
ferrite bead clamped on a cable
will provide – typically- only about 3db of improvement as a general
rule. I am now in a position
Ohboy! Open that can barrel of worms, will you?
Brian, Mike,
Thank you, you have nailed the chief objections we have been struggling
with as well. Our attempt to align usage across the business has received
the strongest objections from the code guys because Microsoft does it. We
will look at the MSDN site as well.
Regards,
Gregory H.
I met an engineer who called them prayer beads. Put them on and pray they work.
-Original Message-
From: CR [mailto:k...@earthlink.net]
Sent: Thursday, March 05, 2015 6:36 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Ferrite Cores on cables and possible reduction
On 3/3/2015
Hello Chris,
Your equipment is required to have a provision for a permanently connected
earthing conductor.
Section 1.5.9.4 gives you three options.
·If your equipment has no permanent connections, it must be Pluggable
Type B. Since you have already described your product as Pluggable
Hi Bostjan / Ted,
Thanks for the information.
The pluggable type A equipment in question has a VDR + GDT in series in the
PSU. Mains cord connection is Line, Neutral and Earth with earth
terminating to the chassis inside the unit. There is also has a provision
for a permanently connected earth
I'm looking for some views on IEC60950-1 Ed.2 + A2 section 1.5.9.4
If you have pluggable type A equipment that has a PSU with a VDR + GDT in
series bridging primary insulation does the equipment have to be
permanently connected to a protective earthing conductor?
Section 1.5.9.4 states that
All good information. My goal as well is to make standards available to our
Engineers and make them more responsible for knowing what they say. I can help
with the interpretations when needed.
BTW, our IT guys just updated our office computers so I wasn't able to read my
Estonian Standards
In message
bn3pr0301mb085131c8760e2fc7cfb6ab6894...@bn3pr0301mb0851.namprd03.prod.o
utlook.com, dated Thu, 5 Mar 2015, Ted Eckert
ted.eck...@microsoft.com writes:
The Class 01 plug has the line and neutral blades, but it also has a
ground wire coming off of it with a fork or ring lug.
A
In message
cajdifgshga41rzs9__2g74_n4gubqzmko+a1arxuxazwsdj...@mail.gmail.com,
dated Thu, 5 Mar 2015, Chris Allen speedtrif...@gmail.com writes:
The question is does the unit have to be permanently connected to
earth?
Yes, but that's the installer's responsibility. Say so, clearly, in the
It is incumbent upon the entire organization to provide a product which is safe
to use. Tort law in this country and laws of many other countries assign
ultimate liability to the manufacturer and no amount of finger pointing as to
whose responsibility it was will get you off the hook. All who
On 3/5/2015 5:36 PM, Richard Nute wrote:
The product safety engineer is a member of that
team, overtly or not, and owns the safety of the
product.
S(he) can't own it forever, though. One designed, a product is subject
to being changed by people the safety engineer might never know -- and
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