On that topic I remember the UK Comedian and retired explosive expert
saying - of making hole in dynamite, before fitting the detonators.
You're supported to use and expensive copper Prodder.
I use a bit of bent fence wire
If it goes bang
I'll never know.
From:
Yes on two recent occasions. But we were able to get them released - before
the steamroller!
G
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Don Clayton
Sent: Friday, January 31, 2003 2:36 PM
To: emc-p...@majordomo.ieee.org
Subject: FCC
Good point John - then we can justify the $5,000 screwdriver.
Gregg
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of John Woodgate
Sent: Friday, January 31, 2003 10:35 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: BeCu problem
I read in
If you browse through the eLearning section of http://www.test4safety.com
you will find several items that deal with hazards from SELV circuits.
CSA standards - like all others - reflect common hazards of Electric Shock -
ENERGY - CURRENT - FLAMMABILITY and MECHANICAL.
The thing saved using
was the first foreign laboratory approved
as
an NRTL. Enclosed find a copy of a directive that discusses NRTLs.
Best regards
Gregg Kervill
Gregg Kervill DipIM, MIMgt, MIEEE
VP Engineering
Test4Safety.com Inc
PO Box 310,
Reedville, VA
22539. USA
Phone ( 804) 453-3141
Fax(804) 453-9039
http
Does anyone know how much it costs?
Beat regards
Gregg
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Richard Meyette
Sent: Thursday, January 09, 2003 1:28 PM
To: emc-p...@majordomo.ieee.org
Subject: RE: 60950-1 DoP
Brian,
There is a CB
: Re: Custom Units in EU
I read in !emc-pstc that Gregg Kervill gr...@test4safety.com wrote (in
015801c2d8e0$0abf5360$7100a8c0@MENHADEN) about 'Custom Units in EU' on
Thu, 20 Feb 2003:
The Simple * rule for the EU goes:-
* Product SHALL be safe
* ONLY If they comply to harmonized standards
regards
Gregg
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Ronald R. Wellman
Sent: Thursday, February 20, 2003 9:44 AM
To: Gregg Kervill; emc-p...@majordomo.ieee.org
Subject: RE: IEC 61010 requirements
Hello Greg,
I have to disagree with your
The Simple * rule for the EU goes:-
* Product SHALL be safe
* ONLY If they comply to harmonized standards they are deemed to be
safe
* If the are safe they bear the CE Marking as a Declaration.
Even if you do not need to apply the CE Marking (e.g. some military
equipment) then the products
Does it contact a live human - if answer no - it is not medical equipment.
The purpose for the medical device directive is to protect people for harm
or infection - being alive would seem to be essential for this.
G
This message is from the IEEE EMC Society Product Safety
Technical Committee
When the product differs from your product description - (most) auditors are
expressly forbidden to make engineering judgments - therefore is it says
Painted Steel in the narrative description and its actually Anodized
Aluminum then he will have no option but to stop shipment.
Best regards
I'm sorry but I seem to have missed the purpose of this question.
Is it to find the source document for the simple and purist reason of
Knowledge?
I most sincerely hope that you are forced into justify these essential
tests.
Gregg
Having lost sight of our objectives we redoubled our efforts.
I fully agree with Richard Hughes – it is an interesting article but those
of us who have conducted “Flight Safety” work will find it VERY weak is
its content and treatment.
Whilst EMC interferes (unless you are sitting in a microwave oven) - it is
Product Safety (or the lack thereof) that
I do see a few issues using CDROM's for safety information.
The tradition operations manual that can include uncrating and handling will
be lost - and so will our ability to protect the user. Finding an equipment
manual is never easy in a business but there is usually a picture to help us
match
for failing to
police the LVD - I do not know the outcome - is there anyone in the EU to
help me out?
Best regards
Gregg
Gregg Kervill DipIM, MIMgt, MIEEE
VP Engineering
Test4Safety.com Inc
PO Box 310,
Reedville, VA
22539. USA
Phone ( 804) 453-3141
Fax(804) 453-9039
http://www.test4safety.com
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:
the nice thing about product safety - you never find just one worm
under the rock!
Best regards
Gregg
Gregg Kervill DipIM, MIMgt, MIEEE
VP Engineering
Test4Safety.com Inc
PO Box 310,
Reedville, VA
22539. USA
Phone ( 804) 453-3141 Texas office (512) 989-1589
http://www.test4safety.com/
From
The person making the declaration – e.g. Engineering V.P. in whatever
country – If not in the E.U. then the name and address of the Authorized Rep
is required - but not their signature.
Best regards
Gregg
This and other information is available at
Could this be why so many senior manager subscribe?
Gregg
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Hudson, Alan
Sent: Monday, June 30, 2003 8:41 AM
To: EMC-pstc (E-mail)
Subject: Do you realise how annoying it is?
Rant on
I know it's
Hi Kurt et al – Happy belated 4th – you were right – a little RR and
visiting a client in West Texas.
I shall be giving a workshop at IEEE Boston and supporting the IEEE Product
Safety Engineering Society and NARTE.
All correspondence sent to grandfat...@eglobaled.org is automatically
My physical constants reference bible was produced by Kaye and Laybe (¿sp?)
Gregg
There was also a very good (but short) article by Tektronix in the 70's
called The Lethal Current.
It concluded that currents between 100 mA and 3 Amps were more lethal that
currents of more than 3 Amps because those high currents tended to 'restart'
the heart.
I think I will try not the check
Sorry for the abrupt response but time is short and there are I believe
there are serious issues here.
If you would like to take some of these points off line please email me.
A Class III LASER is dangerous!
For UL/CSA you will need a FDA report. I have just completed just such a
project.
My experience agrees with yours Gert - there is no simple formula to follow.
In my early days as a PSE I tried to draw a flow-diagram of product safety
assessment and decisions.
On the first line I had about 20 options and each of those dropped down to
about 20 more - many of which
RE: (was blank, now Alternate construction strategies)
I think that Kyle has made the point that I was trying to get the group to
discuss - the issue of PERSONAL RESPONSIBILITY - how we developed our
skills - knowledge and expertise in compliance.
In other words - how do we nurture the next
RE: (was blank, now Alternate construction strategies)
Eurolink Ltd. -One Link-199 Countries
P.O. Box 310
Reedville, Virginia 22539
Phone: (804) 453-3141
Fax: (804) 453-9039
Web:www.eu-link.com
-Original Message-
From: Gregg Kervill [mailto:gkerv...@eu-link.com]
Sent
RE: (was blank, now Alternate construction strategies)
I think that Kyle has made the point that I was trying to get the group to
discuss - the issue of PERSONAL RESPONSIBILITY - how we developed our
skills - knowledge and expertise in compliance.
In other words - how do we nurture the next
Not to mention Lithium Batteries.
An A sized LiSo2 cell can still deliver more than 90 (NINETY) Amps After
being short circuited for 15 minutes.
Lithiums can also explode - which is why it take many hours to verity and
test the charging and ANTI-charging circuits in some products.
Gregg
Hi
REMEMBER THE EMC FILTER!
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your subscription, send mail to:
I once worked for a Quality manger who insisted that everyone wrote using a
black ball point pen.
He was the exception (using pencil) When I challenged him we replied So I
can rub out my mistakes. God please him...
The main advantage of the note book over PDA and laptops are:
They show who
Good Morning John, and how are you today?
Many thanks for your answer - I could not have hoped for a better
illustration of what happens when a reader does not understand the
background behind, the intent or the values of the person (or the committee)
doing the writing, and then gets it totally
conglomerate group that works in geological
time. That is the day to day role of a PS engineer.
Either we (as professional compliance engineers) have the knowledge and
experience to judge for ourselves - or we need to broaden our experience -
or we should not be in regulatory compliance.
Gregg Kervill
.
COPYRIGHT Butterworth-Heinemann andGregg Kervill
The Limitations of the guidance notes
In addition to a detailed step by step guide to electrical safety, this book
contains an Easy Guide. This provides simple, easy to follow steps that will
result in a compliant product, at the same time
I agree whole heartedly with John's point.And while deliberation may not
always be a bad thing, a lack of immunity in an industrial computer must
always be a bad thing, and very possibly a BAD THING!
--
However it is not so much a lack of standards but a lack of will and
commitment to
As with all things regulatory there are exceptions.
The FDA also test certain types of Medical Devices, and LASERs - we had a
class III LASER for a portable CDR/W.
Gregg
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of
It's easy - he hides in his trunk.
-Original Message-
From: Estrella Gil-P19838 [mailto:gil.estre...@gd-decisionsystems.com]
Sent: Friday, October 26, 2001 1:16 PM
To: 'Gregg Kervill'; wo...@sensormatic.com; emc-p...@majordomo.ieee.org
Subject: RE: A Fish by any other name would smell
Just to cause a minor spin to this thread - We used a thin card (about
0.01)that we called Elephant Hide.
G
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of
wo...@sensormatic.com
Sent: Friday, October 26, 2001 7:57 AM
Just to ensure that I have my understanding right - if the equipment is used
where OSHA applies then it must be approved by a third party like UL
If it is domestic then it does not (in most states.
Comments please.
AND, does anyone have a list of States where certification is mandated?
Best
To: gkerv...@eu-link.com; phopk...@ga.conklincorp.com;
emc-p...@majordomo.ieee.org
Subject: Re: TNV Circuits
In a message dated 10/23/01, Gregg Kervill writes:
Have lines ever been struck by Lightning?
One of my clients had a cupboard full of telephone products destroyed by
all sorts
Have lines ever been struck by Lightning?
One of my clients had a cupboard full of telephone products destroyed by all
sorts of bazaar events - like the temporary three phase power line to a
factory that fell' across domestic phone lines
Anything outside must be considered hazardous and
Hi Rich - I know what is says - but I just picked up my LAN cable and it
reads:ETL VERIFIED TO EIA/TIA TSD-40 CATEGORY 5 E111018 TYPE CM 24 AWG
(UL)LL92833 CSA TYPE FCC FT4
'nuff said...
Best regards
Gregg
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Chris Maxwell
Sent: Wednesday, October 17, 2001 3:25 PM
To: Gregg Kervill; am...@westin-emission.no; emc-p...@majordomo.ieee.org
Subject: RE: UL - marking - gentle warning not to extrapolate.
This thread
It is - however - wise not to read too much into this decision and assume
that obtaining a CB Report from a UL Product is matter of fact.
There are many pitfalls. E.g. - X and Y Caps may be have been reviewed to an
older (950) standard that permits compliance to EITHER UL OR IEC.
Been there
That is what product safety engineering is all about - developing 20/20
foresight. Life is just Sooo easy for the EMC guys : ^}
Best regards
Gregg
-Original Message-
From: Gary McInturff [mailto:gary.mcintu...@worldwidepackets.com]
Sent: Monday, October 15, 2001 10:48 AM
To: 'Gregg
Transfer of EMC CertificationWhen I handled just this scenario for one of
Digital's acquisitions I had the CEO of Company A sign a letter granting
Digital all right to product families XYZ (et al) and to the appropriate UL
files.
I then had the files transferred to our listing - the
The standards and methodology that I have used for UL/CSA and CE Marking is
to select UL Recognized batteries AND then focus upon:
Short Circuit
Reverse Charge
Overcharge
This is the best PRACTICAL guidance material that I have found.
!The protection issues are MUCH more complex that
This reminds me of a problem I had with UL Heat-Shrink Sleeving.
Company A had the UR mark and it was sourced from two distributors.
Distributor B maintained the identity of the manufacturer on the rolls of
sleeving - there was no problem.
Distributor C cut the sleeving in short lengths and
Plastic become very flexible above 60-120 deg C - long before they become
molten.
950 requires testing to ensure no hazard at at temperature of 40 deg K ABOVE
the maximum operating temperature.
Hence a component achieving 75 deg C at ?35? deg C Ambient with an equipment
operating temperature of
There is also the tragic story of the aircraft subcontractor that provided
an extra strong canopy for the cockpit without telling the manufacturer -
all went well until a pilot was forced to eject - with fatal consequences.
Product Safety is an exercise in looking for the worst that can
We are not far apart Rich,
However - I agree with the concept of teaching engineers to open their eyes
and seeing what is before them - that is how we make progress. I do not
believe that setting down even more rules will help the situation - it will
cause only opportunities to deviate from the
I feel that we are missing the point of Product Safety and trying to
over-simplify the issues (please read John Woodgate's excellent reply).
The culture for product safety is totally different to that required for EMC
and Functionality testing.
Let me answer by giving another example - also
This is a natural reaction - and even an 'Enforcement Officer' in the UK has
produced a book suggesting that you can do a safety review and apply the CE
Marking for safety using only ONE template (which happens to be his
book!!!).
Consider the number of PRODUCT standards written - these reflect
PLEASE NOTE THAT IT IS 500gms +- 25gms
Best regards
Gregg
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Scott Lacey
Sent: Tuesday, September 25, 2001 5:39 PM
To: emc-p...@majordomo.ieee.org
Subject: RE: Steel
And how much for the Calibration Certificate?
BTW - I have NEVER (in 10 years) used the pendulum test - I have placed the
UUT (or a representative piece) on the floor and dropped the steel ball
through a tube onto the test piece. (IMPORTANT NOTE - STAND ON A CHAIR - it
bounces and it hurts!!!)
Just to add to what Rich has stated - the CMRR will also vary with frequency
for both passive and active systems.
These variation are caused by small differences in the LCR coupling of the
probes and the finite bandwidth of any amplifier.
I remember using a very high gain product (A Thermal
No but there have been several companies in the UK that were closed down by
Enforcement Offices until they corrected Safety and EMC defects that they
were discovered. Another company voluntarily ceased production for 6v months
whilst tooling was modified.
Best regards
Gregg
Gregg Kervill
I have design speed and phase controllers for small systems running at 64
krpm (IR scanner) that used low pressure Helium to reduce drag and to
operate 'air' bearings.
Some of the big problems in cars are going up-hill and running into ditches
(gyroscopic effects) and what happen to that energy
Dear All,
Whilst this group is a useful source of information exchange my personal
feeling is that the Group is worthy of far more than that.
I would therefore like to suggest that we keep a subject line permanently
open on the development of future engineers (compliance and others). This to
Dear All,
Sorry if this is out of place - I have been out for a day and am going
through messages in reverse order...
I would like to support what Doug has said - moderating a user group is a
thankless task - it requires enormous personal effort, not just with the
technical issues - but in the
Hi David,
Please have a look at the free On-Line training courses that are on our web
site at www.test4safety.com, follow the E-Learning Solutions link and
download ES/2001/INTPWRSUP/D 007
The solution is there.
Best regards
Gregg
PS - we are tidying up the material so it may change over the
This works well unless you are working with high voltages (and low power),
In my early RD days I was taught that, if in doubt, (AND AFTER waving an
earthed conductor all over the circuit) to keep my left hand in my pocket
and stand on my right leg. If something din go horribly wrong the current
Liars, Damn Liars and .
I sounds like the Pareto's law from management statistics You can do 80% of
the work with 20% of the effort...
I think someone requoted it once as You an fool some of the people all of
the time.
Cynically yours Gregg
ULC vs. CULUL Underwriters' Lab is the Agency - it Lists PRODUCTS or
Recognizes Components for North American use.
(The Canadian counterpart is CSA Canadian Standards Association)
Historically you had to apply to BOTH agencies to have a product Listed
(Recognize) and Certified (for Canada).
Twp
Hi Rich
There was also a very good (but short) article by Tektronix in the 70's
called The Lethal Current.
It concluded that currents between 100 mA and 3 Amps were more lethal
that
currents of more than 3 Amps because those high currents tended to
'restart'
the heart.
Hmm.
There have been several reports here (in the US) that airlines are placing
guns or stun-guns on aircraft.
I understand the risk of a bullet - I understand that the risk can be
reduced by using a flat, disc-shaped, rubber projectile. BUT, the though of
ANYONE discharging a stun gun on a flight
-
-From: Gregg Kervill [mailto:gkerv...@pgtv.net]
-Sent: April 29, 2002 7:29 AM
-To: richwo...@tycoint.com; emc-p...@majordomo.ieee.org
-Subject: RE: General Product Safety Directive - sorry missed something
-
-
- -Let's take an example of a non-rechargable 9V battery operated -ITE
-product(sic
John is absolutely correct - an experienced engineer can run through '950
with a product in a couple of hours AND record WHY the various clauses and
entire sections are not applicable to a simple product.
I certainly would not intend to spend more time than that on something
simple - HOWEVER -
-Let's take an example of a non-rechargable 9V battery operated -ITE
product(sic)
Consider the liability and your defense - it you review to the ITE standard
then you have performed due diligence - if you do not review to the ITE
standard then you have not!
If you assume that the product
I agree - ALL semiconductor demodulate.
If they did not then there would be NO distortion in amplifiers and most of
the HiFi industry would be out of business.
Demodulation is only part of the problem however.
Consider a semiconductor switching a relay.
The semiconductor may switch the
of the
service provides to provide service! : ^ ]
Best regards
Gregg (Kervill)
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of richwo...@tycoint.com
Sent: Thursday, January 03, 2002 8:26 AM
To: emc-p...@majordomo.ieee.org
A client recently purchase a Bell Phone answering machine and it looses
messages whenever there is a brown-out.
The manufacture (Northwest Bell Telephones) told that the telephone was not
'guaranteed' to retain messages when the power went off.
The client has checked the batteries - which are
I cannot comment on EMC but this is not acceptable for safety.
PLEASE refer to my previous comments about using a split +115 zero -115
supply and being unable to measure Earth Leakage Current.
Best regards
Gregg
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
...@majordomo.ieee.org]On Behalf Of John Woodgate
Sent: Friday, December 13, 2002 5:00 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: Location of CE DoCs - electronic copies
I read in !emc-pstc that Gregg Kervill gr...@test4safety.com wrote (in
004901c2a1ee$e45d66d0$7100a8c0@MENHADEN) about
or you go through bits in an electronic file cabinet.
How does any of this equate to minimum acceptable limits - simple
seems efficient to me.
Gary
-Original Message-
From: Gregg Kervill [mailto:gr...@test4safety.com]
Sent: Thursday, December 12, 2002 6:58 AM
To: 'Chris
There is a problem with ..the reader is guaranteed to get the latest
revision as stored in our Document Control system.
The latest drawing has NO RELEVANCE WHATEVER to the CE Marking File. What we
are required to record is the As Built Standard of the product tested - in
terms of its Safety or
How low is 'low'?
The simplest way is to make it a Limited Current Source then the relay is
not a safety critical component (and redundant) can be purely functional
and the operator will not feel any pain if it fails.
Best regards
Gregg
-Original Message-
From:
Electronic copies versus electronic copies.
As I see it the issues are
ONE-
If you scan the document and store them on CDROM then there is no problem
restoring them. EXCELLENT IDEA.
But if the data is linked to a LIVE drawing system than this could
It may be your job to point out the law – but it should NOT be your job to
explain it.
If they are in UK why fight them?
Just get you college to send them (and several independent people – Company
Secretary) a note pointing out the risk to the company and to themselves and
end it with a
I think that is correct - but it went from IEC 380 through IEC 435 to IEC
950
I should have a copy of the UL478 and CSA..220 standards that we used for
ITE at the time - from memory I cannot remember what they said but if I find
them I will post their requirements.
Best regards
Gregg
Horizontal bar with three (vertical) wavy lines/
G
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Cereceres, David
Sent: Wednesday, September 25, 2002 7:13 PM
To: 'emc-p...@majordomo.ieee.org'
Subject: Safety Symbol
The Ground Pin of the power cord OPENS a mechanical shutter and a permits
the Hot and Neutral to enter the wall socket.
Without this Ground pin (sometimes made of plastic) you cannot make any
connection.
Best regards
Gregg
Gregg Kervill DipIM, MIMgt, MIEEE
VP Engineering
Test4Safety.com Inc
PO
!
The limit is to prevent death and serious injury. It will not prevent ALL
deaths but a 'reasonable' percentage of the normal population.
In the same way there are limits set on how many passages an aircraft
designer can kill per 1,000,000,000,000 hours of flying.
Gregg
Gregg Kervill DipIM, MIMgt
Like so many view and opinions presented here you, John, are also right.
The standards are not intended to describe more than a FIRST ORDER level of
safety beneath with there may be a public danger.
Hence - enforcement agencies and consumer groups rightfully get agitated
when manufacturers do
!
The limit is to prevent death and serious injury. It will not prevent ALL
deaths but a 'reasonable' percentage of the normal population.
In the same way there are limits set on how many passages an aircraft
designer can kill per 1,000,000,000,000 hours of flying.
Gregg
Gregg Kervill DipIM, MIMgt, MIEEE
I have seen motor controllers that are pluggable type 'A' and store a charge
of more than 5,000 Joules - if the inlet plug is pulled out of the wall
socket all that protect the Operator are the blocking diodes of the bridge
rectifier.
The standards already cover this - diodes do not meet
discharging the decoupling capacitor - fire hazard (if more than 240
or 50 VA) and electric shock hazard in reasonable misuse.
QUESTION - why does everyone thing EMC when it comes to compliance - it is
SAFETY that kills!
Gregg
Gregg Kervill DipIM, MIMgt, MIEEE
VP Engineering
Test4Safety.com Inc
PO
Thanks for identifying the States Rich - I have tried to get that list for
ages.
BUT - There is an IMPORTANT caveat - if the product is to used where OSHA
rules apply then it is mandatory that the product be 'approved' by a NRTL of
which UL is the most easily identified. So if the product is for
I have seen motor controllers that are pluggable type 'A' and store a charge
of more than 5,000 Joules - if the inlet plug is pulled out of the wall
socket all that protect the Operator are the blocking diodes of the bridge
rectifier.
The standards already cover this - diodes do not meet
My experience is much the same - USE A STRUCTURED APPROACH - Identify the
Need - plan to Do what is Necessary for your product - CONFIRM THE NEED
before commitment.
Best regards
Gregg
PLEASE NOTE:
We are currently experiencing serious problems with our service provider
PLEASE reply only to
Alternatively take the output from the Variable Voltage Transformer (Variac
is a trade name) to a good quality isolating transformer - then you have all
the low leakage you want. (Remember inrush currents.)
Gregg
--Original Message-
-From: owner-emc-p...@majordomo.ieee.org
--Original Message-
-From: owner-emc-p...@majordomo.ieee.org
-[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of
-douglas_beckw...@mitel.com
-Sent: Tuesday, January 29, 2002 8:40 AM
-To: Gregg Kervill
-Cc: 'Chris Chileshe'; emc-p...@majordomo.ieee.org
-Subject: RE: CE Marking - Prototypes
Hi Dereck
Let me start by asking one simple question - WHAT IS THE PURPOSE OF
CERTIFICATION?
1- to meet the legal requirement
2- help market the product
3- do the 'right thing'
4- not to kill anyone
5- make sure that the product is nor recalled
Most companies will
I know that one should not advertise BUT I think that Claude Lyons
(b...@lyons.demon.co.uk) has a solution to this by injecting a difference
current to balance the distortion. I simple terms like the Current Dumping
amplifiers.
Comments Bill?
-Original Message-
From:
I almost agree John :^]
--Original Message-
-From: owner-emc-p...@majordomo.ieee.org
-[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of John Woodgate
-Sent: Tuesday, January 22, 2002 2:37 AM
-To: emc-p...@majordomo.ieee.org
-Subject: Re: EN 61000-3-3 compliant heater controller
-
Hi Chris, you have opened a number of important issues and seem to have
illustrated the chasm that existed between what safety engineers do and what
people 'think' safety engineers do.
Please forgive me answering it in the following manner
-Original Message-
From:
Ted,
I think that what you meant to say was Strangler than Diction!
G - VA
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Ted Rook
Sent: Friday, October 25, 2002 11:15 AM
To:
Subject: Re: Definition ? Brit response from
I'm used to be taken aback when someone said, excuse me - I now realise
that they love hearing English spoken as it is write. G
An Englishmen in VA.
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Ted Rook
Sent:
Can someone advise if the importer or manufacture takes the product to a
test house and asks to test to a certain standard is there any legal
obligation on the test house to advise of other implications or standards.
This could be tricky - the Directive place liability on ALL IN THE SUPPLY
this
is an opportunity for the enforcement services to save money.
Best regards
Gregg
Gregg Kervill DipIM, MIMgt, MIEEE
mailto:gr...@test4safety.com?subject=Valid%20Reply
VP Engineering
Test4Safety.com Inc
PO Box 310,
Reedville, VA
22539. USA mailto:gr...@test4safety.com?subject=Valid%20Reply
For the record - I was doing a Single Fault analysis on a product that used
a PTC and a relay to prevent welding switch contacts. (No it was not my
idea - because...) when I got the engineer to simulate a s/c PSU the PTC
exploded - sent burning material out through (compliant) ventilation slots
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