From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John
Woodgate
Sent: Tuesday, September 18, 2007 2:44 PM
To: emc-p...@ieee.org
Subject: Re: Declaration of Conformance - a plea for accuracy of
language!
In message p06240821c315ebec2ece@[192.168.1.24], dated Tue, 18 Sep
2007,
If the 24 Vdc supply meets NEC Class 2 requirements, use Class 2 wiring
methods. If not, use Class 1 wiring methods.
See NEC Article 725.
Regards,
Peter L. Tarver, PE
ptar...@ieee.org
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf
Of Stone, Richard
Sent: Tuesday,
In message p06240821c315ebec2ece@[192.168.1.24], dated Tue, 18 Sep
2007, Nick Williams nick.willi...@conformance.co.uk writes:
Given the name I chose for my company, I'm particularly (some would
probably say overly) sensitive to this issue, but here goes...
There is no such thing as a
Ahh, but therein lies the rub Nick.
Your determination of what is simple and accurate, may not be the next
persons determination of what is simple and, once the marketing people get
involved, neither may be what they think is simple and accurate. You will
never get agreement on what people want
We also have the Declaration of Conformity for the FCC in the US. So
there are different styles.
Ghery S. Pettit
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Nick
Williams
Sent: Tuesday, September 18, 2007 2:15 PM
To: emc-p...@ieee.org
Subject: RE: Declaration of
Given the name I chose for my company, I'm particularly (some would
probably say overly) sensitive to this issue, but here goes...
There is no such thing as a Declaration of Conformance. The proper
name for the document is (in the case of the European CE marking
directives) is an EC
Testing only shows compliance to the tested device.
With the DoC the manufacturer declares that each single product he is putting
on the market is compliant. This is a totally different dimension and includes
changes the manufacturer’s are doing over the lifetime of a product etc.
Best
Greetings Regulatory Professionals,
I have a need to source for a single-outlet, NEMA 5-15R receptacle
that has a temperature rating of at least 70 deg. C. I have reviewed the
temperature ratings for several manufacturers of a single-outlet receptacle of
this type and cannot find any
In message 74cf408f6fd02b47a20aad68714e9d5d20c...@zeus.ce.test, dated
Tue, 18 Sep 2007, Gert Gremmen administra...@ce-test.info writes:
After all, VDRs should be given the opportunity to protect now and
then.
There is a considerable difference between protecting against an
occasional spike
RATED VOLTAGE is a defined term in 60950.
Tolerances thus need not be taken into account,
as they are not defined here.
That's what the 20% overrating is meant for.
After all, VDRs should be given the opportunity
to protect now and then. Don't overrate.
Regarding the RATED VOLTAGE RANGE:
In message
12d6af78e37dc842b24ef1593c7a035bbe1...@server15.rossvideo.com, dated
Tue, 18 Sep 2007, Donald McElheran dmcelhe...@rossvideo.com writes:
The same requirements are spelled out IEC 60065 7h Edition. The
requirements make no mention of rated voltage tolerances. The standard
quite
Steve:
Your interpretations are in line what we have experienced with our national
certifying NRTL.
The same requirements are spelled out IEC 60065 7h Edition. The requirements
make no mention of rated voltage tolerances. The standard quite specifically
make reference to the RATED SUPPLY
A few additions to Ted and Jim's excellent responses -
Don't assume that these requirements will only apply to cabling. Any
device that could be mounted in the air plenum must meet these
requirements. If your installation guide states that the device,
peripheral, ac/dc converter, etc. can be
Also, look into possible applicability of NFPA 79.
Regards,
Peter L. Tarver, PE
ptar...@ieee.org
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Steve,
If equipment is rated for a nominal 230V, then it would be reasonable to assume
that that is for use on a supply conforming to BS EN 50160:2000, which defines
the voltage and frequency limits for all low voltage distibution in Europe,
including the UK. The upper limit would thus be
The DA for modular equipment is for modules that can be used anywhere. It
is used for those instances where the manufacturer or the final host, except
in portable rf configurations, does not need or does not want certification
of the host. Consequently the requirement that as a stand a lone unit
hello Group,
If installing a UL approved base box (media) that converts 120vac to 24vdc,
are there any restrictions from running this
2 conductor 24vdc secondary output line anywhere in the house? the base is
approved to UL 60950.
Is a conduit needed?, a certain type of connector required? any
Hello Group,
Just looking at Annex Q of EN 60950:2006 regarding the use of VDR's in primary
circuits, and the following is stated;
b) Maximum continuous voltage (2.1.2 of IEC 61051-2)
The maximum continuous a.c. voltage is selected from the list of preferred
voltages and shall be at
Hello Kris,
Building codes in North America place limits on the flammability of
materials used in plenums. The concern is that if a fire starts in an air
supply or return plenum, smoke and flame could be distributed through a
building before they are detected. For example, the area above a
Dear EMCS-PSTC list member,
The 2007 IEEE Symposium on Product Compliance Engineering, sponsored by
the
IEEE Product Safety Engineering Society, will be held on 22-23 October
2007 in
Longmont, Colorado (Denver area). We have a record number of authors
presenting
this year, see
Kris,
There are terms in the National Electrical Code (NEC) that are similar to
“plenum-in wall” and are probably what you are looking for.
Cables routed to penetrate a floor have the Riser designation of R. (Or an
acceptable better rating –designation ends in P. NEC Table 800.154 Cable
In message
2a93eb060709180432u30064644s6773a6ae8cb85...@mail.gmail.com, dated
Tue, 18 Sep 2007, Grace Lin graceli...@gmail.com writes:
My question is: what are the disadvantages to have a 1.5 meter
turntable? The only thing that I can think of is the corners of a
table holding tabletop EUTs
Hi Group,
I got a request if a product is plenum in-wall approved.
I suppose it only concerns the attached cables.
Can any-one tell what “plenum-in wall” requirements exactly are and which
are the requirements applicable in US Canada?
Best regards,
Kris Carpentier
Regulatory
Thanks to Grace the following link from her sheds new light on the modular
transmitter. I have only glanced through the document but there appears to
be cases where shielding is not required.
For K.Balasubramanian..I would go to the FCC with your
question and request an
Dear Members,
I need help to justify the size of a turntable in a fully compliant 3 meter
semi-anechoic chamber. The choices are 1.2 meters, 1.5 meters, and 2 meters.
The largest EUT expected is 19 for all three dimensions.
Turntable size (quiet zone) affects the physical dimensions of a
There is an updated official document issued by the FCC on April 23, 2007 in
regard to the module approval. The document number is ET Docket No. 03-201.
I have seen a device being certified based on this document (without RF
shielding enclosure).
Grace
On 9/18/07,
The TCB is correct in their interpretation. It is not only a question of
passing the limits, it is also a coupling issue. Modular transmitters are
meant to be off the shelf items that can go into anything imaginable.
Proper shielding design will help prevent coupling problems. You can also
ask the
Yes. An EMC lab in China can be accredited by NVLAP or A2LA. You may wish to
contact A2LA and NIST NVLAP for more detail information. Please let me know
if you need contact information. - Grace
On 9/17/07, cgitt...@rochester.rr.com cgitt...@rochester.rr.com wrote:
Grace,
Are EMC
Dear Experts,
For one of our RFID product (13.56 MHz FCC Part 15 sub part C
intentional radiating device) we look for modular approval. There is no
separate enclosure for this product. There is only one PCBA with USB
connector for the host connectivity. This PCBA will get assembled in the
Charlie,
Many of the methods used in MIL-STD-810F are designed to apply shocks of a
known and controlled amplitude using apparatus such as a drop tower or a
shaker. However, free-fall drop tests are recommended to simulate certain
conditions that might be experienced in the field, typically
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