Go to:
http://www.iec.ch/dyn/www/f?p=103:22:0FSP_ORG_ID:1410
and look at the standards from IEC SC21 A. You don't give enough data to
be sure which standard you want. Note that by clicking on the standard
number you can see an abstract and a preview.
John Woodgate OOO-Own Opinions
The manufacturer cannot know that the device will be permanently
connected to a UPS unless the device and UPS are sold together as a
'system'. Only in that case might an exemption be justified, but it
would have to be justified and documented in the EMC Assessment of the
syst
me
form CEN in Europe and ISO internationally.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-19 15:16, Vincent Lee wrote:
Hi John
Good afternoon,
The countries of interest for Aircon Systems are:
1) USA
2) EU
3) South East Asia cou
It helps if you say which countries you are interested in.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-18 23:22, Vincent Lee wrote:
Hi all,
Good afternoon,
1) May I know what are some of the common product safety standards for
Yes, there are big rooms that will accommodate large vehicles or some
large but movable objects, but not everything is movable. As I said, it
would be a very special case, but it it strictly an answer to the
question. I certainly agree that there are other possibilities.
John Woodgate OOO-Own
Of course, but any in-situ immunity test would be a very special (and
probably very costly) case, for which a dispensation for specific
frequencies and/or times of use might be granted.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018
If you could set up a reasonable test scheme, you could use EN 55035 for
in-situ.
Listings in the OJ are held up for legal reasons; the situation is quite
complex but has recently been discussed in this forum.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Obviously, but it's a 'two-fault' condition.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-18 00:48, Scott Xe wrote:
John,
Thanks for your advice! Normally accessibility of live parts is
checked by the appl
. One example I have has only 12 mm, but the socket is not
central in the face of the enclosure so the distance on the other side
is greater.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-17 22:26, Ted Eckert wrote:
Would the
You have misunderstood. The effect occurs with extension cables, usually
fitted with four sockets in a line. It does not occur with wall sockets,
even surface-mounted, because the sockets are large enough to prevent it.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
Well, strictly, an electric shock incident would be a 'two-fault'
situation - plug reversed AND conducting object inserted into the live
socket. In general, two-fault situations are almost impossible to avoid
but luckily also occur very rarely.
John Woodgate OOO-Own Opinions Only
J
I expect they are quite satisfied by the British approvals.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-16 17:48, Scott Xe wrote:
Dear Johns,
Thanks for advice abt other countries using 13A plugs & sockets! Do
they req
GPS applies to anything; that's why is called 'General...'. Anything can
fall within more than one Directive, in fact allelectrical products fall
within both LVD and EMCD, as well as GPSD.
BS 136X connectors are used outside the UK; the EU is not relevant to that.
John W
marketing of such a device might violate the GPS Directive
in Europe, although that is not certain because unshuttered sockets are
legal in some EU/EFTA countries. Since it only affects those countries
that use the BS136X system, the appropriate regulatory action may be
problematical.
John Woodgate
on is allowing a deadline of a year, which is realistic, but
even that might be difficult to achieve.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-13 07:55, James Pawson (U3C) wrote:
John et al,
I’ve had an update from a contact a
Note the change of title and the switch from part 2 of a multi-part
standard (302 066-2) to a single standard (302 066).
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-10 02:20, Larry K. Stillings wrote:
Hi Chet,
ETSI did
This standard is ten years old. A lot has happened since then, and the
document is clearly very minimal. I suggest you enquire on the ETSI web
site about any plans to update or replace the standard.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex
It isn't appropriate to refer to the ICNIRP publications. The correct
reference (for Europe) is to EN 50527-1 and EN 50527-2-1. Unfortunately,
these are not available free of charge. However, they are available at
reasonable prices (in English) at https://www.evs.ee/shop.
John Woodgat
Sounds a bit fishy to me.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-05 22:43, John Allen wrote:
In other words, become an "aquaphibian"/(or something like that :) )/
– “back to the Future” J
-Original Message
be regarded as horrifying now.
If that reduced my intellectual capacity, much is explained.:-P
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-05 20:12, John Woodgate wrote:
Yes, there are very big 'safety factors' built int
,
insomnia, general malaise) were very likely much more due to poor
working conditions and job interest, but the unions are very powerful.
You can't subject people to increasingly strong fields until they show a
reaction, it would be highly unethical.
John Woodgate OOO-Own Opinions Only
J
'safety factors' because research is ethically challenging, and
adverse health effects are widely attributed to causes other than the
real ones.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-05 15:32, McCallum, Andy w
It applies to any LVD product, but there is a flow chart that shows that
a simple assessment is possible if the product has no reasonable
likelihood of producing sufficiently strong EMF.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018
450>
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-07-02 20:22, James Pawson (U3C) wrote:
Hi folks,
Product in question is a masthead amplifier, previously tested to EN
50083-2. This standard (still listed in OJ for EMCD)
Yes, the Commission does not always make the docopocoss the same as the
dow. The situation is known to be unsatisfactory, due to the Commission
changing its criteria for listing standards in the OJ.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh
Yes, EN 55035 is listed under the RED, but there is no docopocoss for
55020 cited, possibly because 55020 was never cited under the RED. So
the only place to look for the docopocoss is the EMC list, I suggest.
Otherwise it's in a sort of limbo.
John Woodgate OOO-Own Opinions Onl
I think you can consider that until EN 55035 is listed in the OJ, there
is no official docopocoss (Date of cessation of presumption of
conformity of the superseded standard) for EN 55020, so you can still
apply it.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
urned up who couldn't work it. We found it necessary to double
the sensitivity again. If you think about a person standing in the ESD
field asa large (poorly-) conducting body, you can see why the effect
can occur.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.w
e of 300 pF (but I don't
trust my arithmetic this early in the morning).
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-06-20 00:10, Doug Smith wrote:
Hi John and the group,
Actually I was just kidding everyone. But I am going to sta
re-squared) of some sort. I'm not sure what pF/ns would represent.
Of course the capacitance of a spherical grandmother of any radius is 1
nanafarad.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-06-19 22:06, Doug Smith wrote:
ve been known to
liken most of EMC testing to 'measuring jelly (Jello) with a micrometer'.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-06-19 22:05, Ken Javor wrote:
Re: [PSES] ESD questio
x27;t be changed.
The question, 'Cui bono?' ought to be asked a lot in EMC committees.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-06-19 21:34, Ken Javor wrote:
Re: [PSES] ESD question What with Doug Smith being active i
Probably handed down on a stone tablet in 1910 and no-one had the
courage to challenge it yet. (;-)
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-06-19 21:18, Ken Javor wrote:
ESD question Anyone out there know the origins of the 150
Doesn't the relation depend on the order of the filter?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-06-14 14:45, Cortland Richmond wrote:
See https://community.keysight.com/thread/18502
excerpt from an answer to a question:
If capacitors do not work, there must be another solution, and it must
be known, because it is in use. Perhaps you could dissect your own (or
preferably someone else's) means of transport to find out.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Ray
ring, the grounding should be good up to at least
1 GHz.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-06-12 22:41, Ken Javor wrote:
Automotive EMC question The CAN bus spec says that shield(s) are to be
grounded at one end only. How
EN 55024 has only a very limited future life. I would not recommend
applying it to a new product.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-26 08:50, Gert Gremmen; ce-test wrote:
Hi David,
CISPR 32 is not relevant as this
The manufacturer can choose which standards to apply. There is no point
at all in applying two emission standards.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-24 06:01, itl-emc user group wrote:
An industrial printer has been
Don't ask for the whole RA, just ask for clear statements about points
than concern you.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-17 20:27, Nyffenegger, Dave wrote:
Re: [PSES] Customer Requests for Risk Assessments
Th
An engineer and a lawyer argued about whose was the oldest profession.
'The creation of the Universe itself was obviously an engineering task',
said the engineer. 'Before that there was only chaos'. 'Who do you think
created the chaos?' said the lawyer.
John Wood
I agree. You may be able to make your published RAR somewhat more
meaningful than others, without disclosing sensitive information. This
would be a marketing advantage.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-17 19:56, Ken
Your generator is damaged: there is probably an open-circuit after the
attenuator, maybe at the back of the output connector. Connecting the
generator to a high-impedance load cannot damage it. It is no more
harmful than operating the generator with nothing connected to its output.
John
It depends on what the product does. if it is a 'consumer' type product,
you are right. If it's concerned with communication (including emergency
communication) or navigation, then special standards apply, especially
if the product is a fixture in the boat.
John Woodgate OOO-Ow
It's not aEuropean committee, it's an IEC committee, and that's 85
countries, see http://www.iec.ch/dyn/www/f?p=103:5:0##ref=menu When it
comes to safety, almost every country that has a functioning national
standards body wants to take part in the IEC work.
John Woodgate O
otherwise it would never hope to finish its agenda.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 21:35, Richard Nute wrote:
/In general, you are right, but IEC TC108 and its Hazard-Based
Standard Development Team, responsible
hours, and even over two days, that's exhausting. It is much better
to contribute by correspondence (email).
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 19:56, Bender, Curtis wrote:
A good training method is to join a
et to
the advanced tests.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 19:24, Brian O'Connell wrote:
The annual PSES and EMC symposiums are the premier venues for compliance
engineering. That said, the PSES symposium sessions
ination of top, bottom and side openings
for fire enclosures;
– alternative requirements for sound pressure.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 18:53, Charlie Blackham wrote:
Kevin
UL run a two day course on 6236
Let us know if you find any. The last time I looked, I didn't find. Not
like EMC training, which is widely available.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-04 18:00, Kevin J Harris wrote:
Hello
I am lo
#x27; from
the drop-down menu.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-05-03 04:53, Amund Westin wrote:
ETSI have published the EN 300 019-series which describes
environmental tests (climate, vibration, etc.) for telecom e
ndicates in itself a need to
fully test.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-27 11:45, Matthew Wilson wrote:
You ask for opinions so I’ll give mine, based on the device needing to
meet the EU EMC directive as you me
Very good advice. Actually, there are grounds (!) for using a balanced
filter, i.e. inductors in both L and N.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-26 19:20, Edward Price wrote:
*Ian:*
**
*It sounds like the low-pass
If so, have you got a bigelectronic motor drive (VSD?) nearby? They
/should/ be assessed, at leas for conducted emissions, after
installation, but
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-26 15:24, McBurney, Ian wrote
It's rather unusual; what have you got in the factory that might be
causing it? Can you try powering the LISN from a spur taken directly
from the main breaker box, with nothing else connected to the spur?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Ray
You might ask the manufacturer of the LISN. Maybe it's faulty.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-26 11:32, McBurney, Ian wrote:
Dear Colleagues.
I am setting up a mains conducted rf emissions measuring system a
By 'troublesome' I meant 'emissions over, or too close to, the limit,
that can't be easily reduced.' If the emissions are low enough or can be
made so, why bother to ask about need to test?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.
Do you even need to justify not testing,if it doesn't produces
troublesome emissions? The only justification I can see might be that it
is used only for periods of a few minutes a few times a year.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh,
It depends on the opinion of the regulatory authority in the country of
sale. In Europe(applying the EN versions), it is the manufacturer's
responsibility to justify and document the decision on partial testing,
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjo
Go to:
http://www.iec.ch/dyn/www/f?p=103:22:0FSP_ORG_ID:1247
and look for publications in the 62153 series. There are several.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-20 16:05, Grasso, Charles wrote:
Re: [PSES] Using a
IEC 60512-23-3 might be of interest, but I don't have a copy.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-19 16:23, Grasso, Charles wrote:
Hello all,
In lieu of using shielded chambers/spectrum analyzers and such, has
a
hange.
Do we rename the list 'IEEE Philosophical Society'?(;-)
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-17 20:24, Nick Williams wrote:
In the medical device context, no this is not correct because the
failure of t
Thanks for the explanations. However, I still think that at some point
risk assessment is inevitable.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-17 00:22, Richard Nute wrote:
… how do you test *objectively* the adequacy of a
dily; how do you
test *objectively* the adequacy of a symbol like the ! in a triangle,
meaning, well, I think it has had more than one meaning over the years?
I do wish there was a way of eliminating it, but I don't see one.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates w
There is obviously no unique answer. You can:
- not use USB and provide a charger with a unique connector (my choice);
- use USB, but put full overvoltage and overcurrent protection in your
product;
- rely on warning notices (not recommended!)
John Woodgate OOO-Own Opinions Only
J M
That should be warned about in the data sheet. Internal EMC problems
tend to be rare, which is good, but because they are rare, there should
be warnings if they can occur.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-09 13:19
e the pass-band, it is an antenna connected to a diode. And
yes, it can pick up power rail noise.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-09 04:27, Doug Smith wrote:
Hi Ken and the group,
Many analog circuits, as well as the an
A specific target would typically be 'less than 1/3 of the value known
to just provoke trouble'.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-08 04:25, Ken Javor wrote:
Re: [PSES] Power Integrity Question If the ans
PSRR
- none at all.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-07 17:41, Ken Javor wrote:
Power Integrity Question There are many learned
books/papers/discussions on how to achieve proper power integrity by
way of proper P
It may also be significant that the Council of Europe disbanded the
committee that produced that resolution. Post hoc is not necessarily
propter hoc, but on the other hand, it often is.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018
Native English speakers are involved, also costly language consultants.
There is no excuse for bad wording but it's tolerated too much.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-06 08:30, Michael Derby wrote:
Typicall
ICNIRP can be investigated at:
https://www.icnirp.org/en/about-icnirp/funding-governance/index.html It
should be noted that IEEE concluded that recommended limits higher than
those of ICNIRP are acceptable.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh
there is no more appropriate Directive..
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-05 07:43, Seyff Peter wrote:
Colleagues!
We are producing termials for luminaires.
Therefore we also provide a test adapter for our customers.
eryone
knows that the rest of the sentence is true, whether one is exposed to
EMF or not.
Alternatively, you can believe that the relevant IEEE and ICNIRP
research reports are all falsehoods.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
O
siderations, but
a Guide should be in the plainest language possible, not be cryptic.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 21:05, Michael Derby wrote:
Hello Matthew,
Yes, I think you’re right that they mean broadcast ‘
OK, the LVD does not apply, but all its provisions apply. Is that
pernickety enough?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 16:57, Gert Gremmen; ce-test wrote:
The LVD does NOT apply.
For elektrical safety and EMC the
Yes, well, it's typical obscurantist wording. The LVD DOES apply, but
without its low-voltage limit. That is what Article 3 1 (a) says, quite
explicitly.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 16:33, Charlie Bla
two arcuate strips of (preferably) phosphor-bronze, to make contact
with two pairs of adjacent studs. A 90 degree rotation changes the
connections as you want. Supporting structure for the spindle and square
left to your ingenuity. You might be able to make it a bit smaller than
I suggest.
John
ctive. The involvement of the RED is ONLY Article 3 1 (a),
which applies the LVD without its low-voltage limit. Nothing else of
the RED is relevant.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 14:51, Michael Derby wrote:
John,
I
workers to the risks
arising from physical agents (electromagnetic fields) (20th individual
Directive within the meaning
of Article 16(1) of Directive 89/391/EEC) and repealing Directive
2004/40/EC
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
.
You can find details of these standards from the public parts of the
CENELEC (TC106X) web site and IEC (TC106) web site.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 13:38, Grace Lin wrote:
Dear Members,
Is there any
I once had a DPDT knife switch with ceramic base and insulators. Rather
big, though.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-04 04:01, Richard Nute wrote:
Need a switch
Hi Ken:
I interpret your requirement as DPDT, with 3
om LEDs, but no
specific requirements for IR interfaces. EN 55032 and EN 55035 apply in
Europe and CISPR 32 and CISPR 35 in other countries. Again, the EN and
the CISPR standards are not exactly the same.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleig
any more
safety testing.
If anything included uses 'wireless' (that magnetic induction or
radio-frequency, but not infra-red) the RED applies to that product only.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-30 18:27, Chest
You are likely to find the IEC Technical Report TR 62493-1 helpful. Do
you know how to use the IEC Webstore to find out about IEC publications?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-29 15:27, McCallum, Andy wrote
construction than electronics.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-26 15:45, Ken Wyatt wrote:
Hi All,
I’m still looking for a writer that is well-versed in EMC filter
design that can produce a white paper for ITEM Media (paid gig
In the UK, many Government publications are available in English, Welsh,
Scots Gaelic, Arabic, Hindi and Urdu, occasional others, such as
Polish. So far, few are available, I think, in Manx, Cornish and
British Romany, but that could change.
John Woodgate OOO-Own Opinions Only
J M Woodgate
authorities in one or more MS that have
incorporated the Directive.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-24 14:08, Scott Xe wrote:
Before the effective date of an EU Directive such as LVD, the member
state must transpose
If I remember correctly, the text in 60335 was prompted by an incident
in Denmark where a toaster incorrectly switched on due to EMI. Since the
work was done under pressure, it might not have been done in the most
appropriate way, but the end-result is as intended.
John Woodgate OOO-Own
IEC 60335-1. So it is perhaps not unreasonable to put immunity
requirements into that publication if they are not in CISPR 14-2. But if
they are not in CISPR 14-2, why aren't they?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-
duced new
ways that non-members of committees can see and comment on documents.
See the web sites for details. This may require a lot of 'burrowing'.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-19 14:51, Robert Jo
If ntueeestud...@yahoo.com is a genuine student, some NCs will look more
favourably on a request, especially if supported by a tutor. But not all do.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-18 19:59, Ghery Pettit wrote
extensive and to detailed to recount. And
'major' is a dangerous word. A big change might not affect your product
but a small change could put it off the market until it's fixed.
3. Yes, after a lot of headless chicken, it is.
John Woodgate OOO-Own Opinions Only
J
The new series, 63044, are based on the corresponding IEC standards, as
you can see by the leading '6'. The older series, 50491, are home-grown
(in Europe) CENELEC standards, as you can see by the leading '5'.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associ
) but that is probably a rare case.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-14 22:28, Kevin McCandless wrote:
Hello Experts,
I didn’t see my first request show up in my inbox. So I’m trying again…
A customer in Turkey has s
See below.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-13 19:57, John Woodgate wrote:
I suspect that the SELV circuits of an electricity meter never leave
the enclosure, so SELV is OK, but PELV would still be equally safe or
I suspect that the SELV circuits of an electricity meter never leave the
enclosure, so SELV is OK, but PELV would still be equally safe or
better, even if a very low probability open-circuit earth occurred.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
hance
of power-cross is larger and it will remain *undetected* until someone
touches both the SELV and earth.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-13 19:13, Richard Nute wrote:
Dear Mr. Vyas:
I suggest you review the defin
Probably some fail-safe, some reliable. I think that this is why
'safety' involves risk-assessment, not just meeting standards.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-08 21:41, Richard Nute wrote:
In my ear
in
CISPR 16-1 are 'hands-off' because of this, even though some are very
vintage indeed.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-07 14:52, Patrick wrote:
Hello Ed -
Great story- thanks for sharing!
Just last yea
can rarely have too
much documented justification.
The specific answers:
1. Yes.
2. Yes, add them, providing it is documented that the non-conforming
labels are not contradictory or confusing. Can you superimpose the
correct labels?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
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