0189
quarter 0188
squared 0178
cubed 0179
Millifarad sized capacitors are now common
and I have seen one instance of one marked mF.
With the new double layer supercaps multifarad
rated capacitors are also available and
someone is marketing a 28kF capacitor
or if you prefer 0.028MF
Nick
chine is about the size of the air
gap, about 1mm or less. Thus there are very strong magnetic
fields only out to a few centimetres. I don't know if this is the
reasoning behind the field values in IEC 60601-2-24 but
if it is the levels do not seem unreasonable.
Nick Rouse
.
- Origin
rs and users operate in the various countries and you should
beware of the subtle differences between them.
Nick Rouse
- Original Message -
From:
To: "Nick Rouse"
Cc: "emc"
Sent: Monday, March 25, 2002 5:16 PM
Subject: Re: U.S. Safety Regulations
>
>
>
equipment solt to comsumers.
Nick Rouse
- Original Message -
From:
To:
Sent: Thursday, March 21, 2002 9:57 PM
Subject: U.S. Safety Regulations
>
>
>
> There seems to be some confusion regarding U.S. product safety
> regulations. It is not as complicated as so
ible
These figures should be borne in mind the next time
you read about the dangers of the magnetic field from overhead power
lines. I have several times seen building site welders sitting on their
transformers
with their testicles dangling over the gap and I haven't seen welders
dropping like
fli
transformers and other electrical equipment to do so in a vacuum
Although this effect can take some time to produce complete failure
it will very likely do so in the end
Nick Rouse
- Original Message -
From: "Ken Javor"
To:
Sent: Friday, January 25, 2002 6:08 PM
Subject: broadband
Yes, I see a problem , Lightning spikes and the full peak mains
voltage when the mains is switched on at its voltage peak will
pass straight through your capacitors causing a safety hazard
and may destroy the insulation of the transformer if it is
not rated for this voltage.
Nick Rouse
verse one stripe pitch for every 10mph.If the pictures show you have
traversed more than 7 stripe pitches (on motorways)you will receive copies
of these photos together with a summons to appear in court.
Nick Rouse
>Jim Freeman wrote:
>Hi All,
> I apologize for being off sub
l you can show the design meets the new
standards
Nick Rouse
- Original Message -
From: "Kim Boll Jensen"
To: "EMC-PSTC"
Sent: Thursday, January 03, 2002 8:54 PM
Subject: Lasting of the CE marking
> Hi all
>
> I was just seeking through EMC LVD R&TTE
- Original Message -
From: "Nick Rouse" <100626.3...@compuserve.com>
To: "WELLMAN,RON (A-PaloAlto,ex1)"
Sent: Friday, October 26, 2001 9:52 PM
Subject: Re: skinny power cords.
> Earlier on in the thread it was not about arcing across the pins of a pl
t in most plugs built to
of the latest version of BS1363 would most certainly have done so
Nick Rouse
---
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
Hello Gary,
Sounds like your making a case
for the wider adoption of the UK
system with fused plugs rated
to protect the power cord
Nick Rouse
- Original Message -
From: "Gary McInturff"
To: "EMC-PSTC (E-mail)"
Sent: Wednesday, October 24, 2001 5:06 PM
Subject
Certainly not in the U.K. for equipment that may
be sold to consumers. It is illegal to sell such
equipment without a plug to BS1363 already
fitted and with the correctly rated fuse in the
plug. Here and in the rest of Europe the cord
must have IEC colour coding.
Regards
Nick Rouse
A reminder to anyone who carries out ESD tests on IC's
Don't forget to throw away the tested sample. It is easy
for IC's to survive ESD tests and appear to be normal but
to have serious internal damage that will severely compromise
the reliability of the unit
Regards
Nick Rouse
Rendar were taken over a couple of years back
by Schurter. The traded for a while as Rendar - Schurter
but have now dropped the Rendar part of the name
and are just Schurter UK Ltd. They are still operating
from the same factory in Bognor and still making the
same products such as IEC320 plugs and
.
Nick Rouse
- Original Message -
From:
Subject: In-line Fuses
>
> We have an application where an In-Line Fuse would be an easy fit to a
problem. The fuse and holder would be added to an existing internal cable
harness in a
> piece of Lab Equipment (EN61010-1 for safety). The
Peter Tarver wrote in reply to my comment
"The rating of a UL rated fuse is more or less
the current at which it blows. The rating of a fuse to IEC
127 (used throughout Europe) is more or less the working
current of the fuse and the circuit it protects"
> This may or may not be true. Last I
current of the fuse
and the circuit it protects. Thus circuits are used right up to the
full rating of fuse protecting them
Nick Rouse
- Original Message -
From: "Lesmeister, Glenn"
Subject: Products Electrical Ratings De-rated for Eurpoean Branch Circuits
>
>
> Does a
nd the directive may have been modified but if
the directive stands its wording is fairly unambiguous.
Regards
Nick Rouse
Original Message -
From: "Nick Williams"
To: "Dan Teninty"
Cc: "Emc-Pstc@Majordomo. Ieee. Org"
Sent: Sunday, April 01, 2001 8
correspondingly higher as those
generated on the high voltage transmission
lines are transformed down by a lower ratio
Nick Rouse
- Original Message -
From:
To:
Cc:
Sent: Friday, February 02, 2001 7:30 PM
Subject: Re: 230 Vac or 240 Vac?
>
>
> David,
>
> Here is my underst
rest of the
Community
where first use implies taking into service.
The Low Voltage directive is even tougher. There is no trade fairs and
exhibitions
clause. If the equipment is switched on by the customer or your sales rep it
must be
electrically safe and be CE marked for the Low voltag
ransformer they might claim it was buffered
by the transformer. However if they are selling them
through distributors or trade paper adverts the authorities
are likely to form a judgement as to the likelihood of
it being connected to unbuffered supplies, either new
or second hand.
Hope this helps
with, the radiation pattern
can change in the most complicated way.
I know this does not count as anything like simple but
simple sounding questions often have complicated answers
as Benoit Mandelbrot found when he asked 'how long is
the coast of Britain?' I hope you can distil some simp
els are only for the protection of humans.
Nick Rouse
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
To cancel your subscription, send mail to:
majord...@ieee.org
with the single line:
un
ver period
you may use only the new amended version.
Nick Rouse
- Original Message -
From: "Friedemann Adt"
To: ;
Sent: Friday, October 06, 2000 6:56 PM
Subject: Re: EN 61000-3-2/A14
>
>
> I tried to refresh my memory about quoted abbreviations but even using the
Off
From: "Nick Rouse" <100626.3...@compuserve.com>
To:
Sent: Saturday, October 07, 2000 7:44 PM
Subject: Re: Overcurrent Protection: One or Both Sides?
Hello Richard
No, there is only one fuse in the standard BS1363 mains plug .
It is in the live side and the plug is not reversi
I don't know any French but if it is the French implimentation of the
Machinery directive it would not cotain any EN numbers. The
Machinery directive is a "New Approach" directive and they never
specify particular standards. It specifies routes to compliance that refer
to harmonised standards. Sta
erately decided not to test for you have a very difficult case
to make. If you think you could make such a case I suggest your
talents would be much more profitably employed in the law
than in being a compliance engineer.
Nick Rouse
- Original Message -
From:
To: ;
Cc:
Sent: Monday, Oc
- Original Message -
From: "Nick Rouse" <100626.3...@compuserve.com>
To: "FRIES"
Sent: Saturday, September 30, 2000 9:49 PM
Subject: Re: Getting Started
>
> - Original Message -
> From: "FRIES"
> To:
> Sent: Friday, Se
tell them
apart. Get them the wrong way around and in one case you
get a brilliant light that dies in about 100 hours and in the other
a light that lasts almost for ever but is ridiculously dim
and inefficient.
Vive! European Unity
Nick Rouse
- Original Message -
From:
To:
Sent: Tuesday
even if you go in at
baseband video via the "SCART" socket found on most sets, they will not
lock up the NTSC derived baseband video as monitors used to do in
monochrome days. I used to work designing telvision equipment such as
standards converters and it is no small problem.
Nick Rouse
instuctions are needed
for them to be safe.
Nick Rouse
date of publication has passed. Others say
that the state of no standard is being withdrawn.
Nick Rouse
certification under the Approval of Electrical
Appliances Scheme.
They are also bringing in a framework for
EMC regulation and emissions standards
for ITE will be the first stage. Again the
standards, although local are based on
international ones
Nick Rouse
s by customer to be under the same
conditions as is fitted by your service organisation.
The UK Department of Trade and Industry intend
to issue an updated version of their own guidelines
in the next couple of months in response to the
Commission guidelines and it will be interesting
to see whether they fall in line with the Commission
in this matter.
Nick Rouse
quipment outside the scope of the
old version. There was some expectation that this
principal would apply more broadly but if EN55103-2 & -3
are eventually published with a dow of 1 Mar 1997 and
listed in the OJ obviously this is not so.
Nick Rouse
Two relatively common uses of radioactive materials in electronics
are tritium powered luminous bars 'Betalights' and some very fast
gas discharge tube type surge arrestors. The common slower
telephone grade ones have no radioactive materials.
Nick Rouse
f member States relating to
electrical equipment designed for use within certain voltage limits'
Nick Rouse
this definion.
Nick Rouse
I believe the reference is to the ICE 309 series of plugs and sockets. IEC 309
is equivalent
to CEE 17 and is listed in the OJ with relevance to the low voltage directive
Nick Rouse
-4-2
Nick Rouse
imits. I'm still not sure of using IEC950 but the conclusion he came to
agreed with the
interpretation of phrase 'designed for use with a voltage rating of ...' given
by Nick Winter
at the DTI. They regard the directive as applying only to equipment powered by
voltages
within the stated limits
Nick Rouse
It will however make it easier to
meet the
directive.
Nick Rouse.
ation. Although installations
are mentioned in the Commission guidelines. I am not aware of them being
incorporated in any other national implimentation. They are not in the French
or German ones.
Nick Rouse
requirements.
Nick Rouse
you can suppress harmonics. The limit is the practicality of
the use
of such filters. You tend to need values of several henries capable of taking
the DC current
which may be 10's of amps without saturating. Such inductors are large.
Nick Rouse
.
A point in that standard that some may not have noticed is a that there is a
complete ban on the use of half wave rectification.
Nick Rouse
LEC or CEN standard that
had safety provisions of any sort and could be applied
to the product. This is a frighteningly wide definition.
Is this really what people are doing.
Nick Rouse
r.Kiriakadis to list amendment A12 in the OJ.
Nick Rouse
gereric standards call 8kV air discharge.
Nick Rouse
come into force immediately
on listing in the OJ
Nick Rouse
year and there will then be a transition period
before it is mandatory, possibly of 4 years.
In the mean time the generic standards apply to ITE.
Nick Rouse
that
with some directives this is required but for the LVD,
EMC and Machinery directives, if type examinationl
is not require, a manufacturer can declare compliance
based on his own or any others measurements without
any quality system being mandatory.
Nick Rouse
may be arguments as to whether repaired
products are the same products as placed on the market
originally. I would think you would have a good chance of
winning such an argument but it is not clear cut as it is in
the UK
Nick Rouse
yours) as the basis for this declaration but the
must take all reasonable steps to ensure this is valid. They cannot
just pass on your assurance, unchecked and evade responsibility.
Nick Rouse
to the clearance distance is permissable.
Nick Rouse
standards but leaves unclear some
matters where the scope of a standard changes.
4.Non-question, see above
Nick Rouse
The requirement for the last two digits of
the year in which the CE marking was
affixed on the DoC is the 6th indent of
Article13 (6)B of the CE marking directive
93/68/EEC. Note that year numbers are
not called up for the marking itself.
Nick Rouse
processor will be a 120MHz
Pentium. Soon we can expect this difference
to apply to most PC based products.
Nick Rouse
g and mentioned this guidance and
said, according to Dave Imerson, that this implied that
the supplier would have to have written confirmation of
a booking at an accredited test house. Even this degree
of tolerance if not being viewed kindly by the Commission
or other EU members
Nick Rouse
approach
fails when the equipment is comparable is size with the node to
node spacing 1875 to 150mm over the freqency range 80 -1000MHz.
Nick Rouse
further filter to reduce the clamp level to
below the signal threshold. This can be expensive
and bulky if you have a lot of signals but it can be done.
Nick Rouse
rought but I have direct
evidence of one product being withdrawn from the market
as a result of action by a Trading Standards Officer.
I hope this rather lengthy reply finally kills this rumour
Nick Rouse
n the matter of harmonic standards.
I hope this gives you a start on a complcated matter
Nick Rouse
connectors for optional attachments.
A PC manufacturer does not expect that every
computer sold will used only with a device on
every serial and parallel port. The test is intended
to simulate a real risk. Where to apply the test
should surely be governed by where this risk is
real.
Nick Rouse
nally an ESD
test to a coupling plane 100mm from a connector
face can have more effect than a direct discharge
to the pin.
Nick Rouse
want to keep up with new European Legilation may
I recommend the Safety and EMC newsletter
published by ERA technology.
Nick Rouse
standards is not absolutely
mandatory for compliance with the LVD. The catch is
that if you do not fully conform, then from next year you
will need detailed documentation in advance of
marketing showing how you achieve equivalent safety
to that given by the harmonised standards.
Nick Rouse
the general product safety directive on the
declaration of conformity which is a formally defined
document relating to those directives that require it.
Like superfluous CE marks I think that superfluous
delcarations of conformity should be discouraged.
Nick Rouse
It is currently being voted on and in the
event of being approved is likely to be
listed in the OJ in September
Nick Rouse
distributors
catalogues. I will try and trace the origin of this ban.
Nick Rouse
92/59/EEC published in the Official Jounal ref:
OJ L228 of 11-Aug-1992 and came into force
on 29-Jun-1994 and was carried into UK Law
by The General Product Safety Regulations 1994
Statutory Instrument 1994 No.2328 which came into
force 3-Oct-1994
Nick Rouse
in which you don't need to.
I suspect the UK authorities will turn a blind eye to
to a technical breach of this standard during this time
provided the vote is positive but I not so sure the
German authorities will.
Nick Rouse
FCC regulations provide an exemption for
test equipment but there is no similar exemption
in European regulations.
Nick Rouse
every
item may avoid administative delays if the
authorities were to question compliance.
Nick Rouse
tatic discharge
EN61000-4-4 (=IEC1000-4-4) Electrical fast transients
EN61000-4-5 (=IEC1000-4-5) Surges
EN61000-4-11 (=IEC1000-4-11) Voltage dips & interruptions
Nick Rouse
you need them
Nick Rouse
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