Better yet, how about the subscribers taking the additional two or three
seconds it takes to do the responsible thing and delete it themselves?
Peter L. Tarver
Nortel
ptar...@nt.com
-Original Message-
From: Robert Macy [SMTP:m...@california.com]
Sent: Thursday, October 08, 1998 12:05
From: Scott Roleson sc...@hpsdde.sdd.hp.com
Subject: Re: Shield Room Grounding
Date: Thu, 8 Oct 1998 14:17:56 -0700
To: emc-p...@ieee.org
Cc: sc...@hpsdde.sdd.hp.com
Barry Ma forwarded to me a message from Peter Hays that said:
Can someone tell me
Yea, I do. This is going to add time and cost to the test procedure in
place and I don't see it fixing any problems. I might concede that it
may be a more repeatable reading on cables, but that is secondary to the
real issue.
The real issue is this. Is the lack of this testing causing a
I believe that your experts are wrong...4.2 is a rather odd number to come up
with. The most common requirement here is SUPPLEMENTARY INSULATION for a
PRIMARY CIRCUIT at 250Vrms (as defined by EN 60950) between the TIP/RING (line
side, or TNV-3 side) and the modem or device side. 2.5mm of
Hello Diaco:
My reading of Clause 6 of IEC 950/EN 60950 is:
between TNV circuit and primary circuit:
double or reinforced insulation, including applicable
creepage distance and clearance, or
basic insulation and a grounded conductive barrier,
including
In most cases, Norway, Sweden and Finland? require supplementary insulation
for a primary circuit between TNV and Ground\/SELV. Assuming a primary
circuit of 250VAC, I believe this works out to 2.5mm creepage and 2.0mm for
clearance (I don't have my standard handy). In addition, you need 0.4mm
Glen,
Norway, Sweden and Finland are correct. The Finish deviation for this is
somewhat hidden, it is in clause 6.2.1.4, where it states that Earth Ground is
not permitted as a level of protection between Mains and TNV. Double (BASIC +
SUPPLEMENTARY) or REINFORCED INSULATION between is all
Members,
Can anyone enlighten me whether reugulations exist in EU countries (
Excepting the UK) which advise against or prohibit the practice of
feeding duplicated powere supplies from different 230 V phases into
the same shelf or rack of telco TDM ( or any) equipment. The UK
regs
I have an electronic (WORD) copy of the SLIM document.
REPORT OF THE SLIM III TEAM ON THE
ELECTROMAGNETIC COMPATIBILITY DIRECTIVE
(89/336/EEC as amended)
Please email me if you would like a copy.
Keith L. Nicholas
Manager, Electrical Controls
AMP Incorporated,
ISO/DIS is available at:
http://web.ansi.org/reports/master.asp?room=22
http://web.ansi.org/reports/master.asp?room=22
-Original Message-
From: Matejic, Mirko [SMTP:mmate...@foxboro.com]
Sent: Wednesday, October 07, 1998 7:07 AM
'Single point ground' in this situation is used for the same purpose
as we would in electronics design. When using a shielded room for
making low frequency measurements (particularly MIL-STD), multiple
ground connections can make significant power frequency and harmonic
noise. Generally this
Can somebody confirm information I picked on the radio that each Shuttle
launch causes a major damage in the Ozone layer?
Mirko Matejic
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line:
You should post it in the contributed document section of the RCIC.
Monty Griffith
Senior Product Safety Engineer
Intergraph Computer System
Huntsville, AL 35894-0001
PH: (256) 730-6017
FX: (256) 730-6239
http://mecsrv.b29.ingr.com
-Original Message-
From: Nicholas, Keith L
Hello PSTCers,
Last night the 100,000th visitor entered the Safety Link (the web's most
comprehensive collection of electrical product safety and standards
resources.) Our counter was started towards the end of 1995. 40,000+
have visited in the past year and the rate continues to climb.
ThanX
Hello group,
I currently have a number of the IEC 1000-X-X standards and test in
accordance with them, EN 50082-1:1997 references the EN 61000-X-X
standards. Can I safely continue to use my IEC 1000-X-X set or do I have
to buy the EN 61000 series.
any comments appreciated
Thanks
Jeff Bailey
Hi Ed,
I appreciate your kindness to share your experience with us about
constructing equivalent load: I constructed a load bank consisting of 16
surface mount light bulb sockets, all wired in parallel. I just screw in an
array of 25/60/75/100 Watt rated lamps until I get the necessary
Hello Diaco,
As you can see from all the responses to your question, you have
received many contradictory answers! As the Israeli member of the
IEC 950 WG7 Committe, I would like to provide you with the
correct answer. However, I would first need you to provide me with
details of what a DAA
To my knowledge, Germany is the only country that has an
acoustics law that affects routine ITE. The German Workplace
Law sets limits in the 60+dBA? range for workplaces. OSHA also
sets limits, but they begin (as I recall) around 85dBA, and well
above routine ITE noise.
Where acoustic levels
[Correction to prior note below. German limits are for imission
as opposed to emission. It is the total sound pressure as
measured at the worker's location. Therefore, it is the employer
who is held accountable to provide equipment, drapes, carpet,
or whatever that helps meet the limits.]
To
The IEC is simply renumbering the 1-x-X series to become the 61000-x-x
series. Any new standard in that series will be numbered 61000-x-x.
Existing standards are not going to be re-issued just to change the number,
but when they are re-issued for whatever reason, the numbers will be
changed.
Hi Barry et al,
I'm I missing something here? Is this exercise worth the trouble? If one
doesn't have a clear margin to any commercial limit line with any kind
of resistive dummy load attached to your LISN shouldn't you examine the
your system setup? Accurate determination of your measurement
All I found was the following from 1996 ...
http://www.ssnewslink.com/html/governme.html
At 09:44 AM 10/9/98 -0400, Matejic, Mirko wrote:
Can somebody confirm information I picked on the radio that each Shuttle
launch causes a major damage in the Ozone layer?
Mirko Matejic
-
This
From: Gary McInturff gmcintu...@packetengines.com
Subject: Two diverse questions
Date: Fri, 9 Oct 1998 11:05:11 -0700
To: 'emc-pstc list server' emc-p...@ieee.org
* TNV3 connectors are BNC types - are their connectors that can
provide higher density
Unfortunately, my Email system does not allow me to edit any Email I am
replying. For example, Peter, I am not able to change anything of you
message.--Barry Ma
-
Original Text
From: Peter Tarver peter.tarver.ptar...@nt.com, on 10/8/98 2:57 PM:
Better yet, how about the
Dear PSTC Members,
Assuming a manufacturer had UL1950 Third Edition Recognized
Component Class I (earthed) ITE Power Supplies and they wanted
to have a Listing (as an open-end device) to the Standard for
Industrial Control Equipment, UL508.
1) What additional requirements must be met? I am
Dear Fellow Members,
Per UL1950 and EN60950:
1) Can you tell me what type of capacitors will be suitable to bridge
basic insulation between TNV-3 circuits and SELV circuits?
2) Assuming that the body of above TNV-3 to SELV capacitors can
touch SELV components, can the body be considered
Forwarded message:
From: Self Single-user mode
To: pstc-...@ieee.org
Subject: UL1950/CSA C22.2 950 Third Edition; Telco Overvoltage Tests
List-Post: emc-pstc@listserv.ieee.org
Date: Fri, 9 Oct 1998 23:50:09 +0200
Dear Fellow members,
After the application of the Overvoltage Tests to telecom
Dear group,
I have a question on defining the RATED VOLTAGE that should be applied to
TNV in UL1950 Clause 6.3.3.1 Additional Test for separation between
telecommunication network and earth (Figure 17) for a Class III device that
operates from an external nominal 12VDC (SELV) Listed Class II
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