Rich,
I think you must be correct. I do have anecdotal evidence of persons being
knocked on their butts by grabbing hold of an Ethernet coax in a large
facility and trying to connect it to a computer.
My experience is in EMC and the 10Base2 Ethernet (coax) is a persistent
offender. (Actually,
Rich -
An on-line search of those available (back to 1996) at the
GPO web site shows no sign of 1002.61. However, my paper
copy dated 1993 shows 1002.61 is the first subparagraph of
Subpart G, Codes for Reporting Listed Electronic Products,
and 1002.61 is titled, List of specific product
Ken,
It depends if compliance with the Ethernet standard is important to you. If
you connect to anyone else's network where someone else may be dealing with
a coax that is grounded on your end, then it is probably important. If not,
then it may not matter. This is a product safety issue. I
Hi,
Does anybody know the differences between E26 and E27(lamp base)? Thanks.
Regards,
Carl Yi
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we've had good success with the
built capacitance of 9000pf as well,
depending on test being discussed and
frequency, certain cap. values from the shielded
ring of the UNgrounded ring to earth works well
for low freq.. 30 mhz.
Richard,
From: Knighten, Jim L [mailto:jk100...@teradata-ncr.com]
Ken,
It is a potential shock hazard if the coax run is long and runs from
building to building (for instance) where the ground potentials may be
different in the different buildings. One can develop a large potential on
the shield of the cable, so that if you put yourself between the cable
Jim/Richard;
Any update on the data transfer from http://ieeepstc.mindcruiser.com/
http://ieeepstc.mindcruiser.com/ to
ttps://www.ieeecommunities.org/emc-pstc
https://www.ieeecommunities.org/emc-pstc... or a tentative date?
For your information... the Yahoo group
Jim,
Thank you! That took care of my concern.
Ken
on 3/5/03 4:11 PM, Knighten, Jim L at jk100...@teradata-ncr.com wrote:
Ken,
It is a potential shock hazard if the coax run is long and runs from
building to building (for instance) where the ground potentials may be
different in the
If all the ac equipment is powered by the same local source, and all the ac
powered equipment is case-grounded within the same rack, is it correct to
assume that the safety issue is moot? That is, can I then use a grounded
bnc connector at both ends?
on 3/5/03 4:02 PM, Robert Macy at
Assume complete ignorance on my part. What is the safety concern?
on 3/5/03 3:50 PM, Knighten, Jim L at jk100...@teradata-ncr.com wrote:
Ken,
Safety considerations are the reason for the spec requirement. You are
allowed to ground the shield at one point.
Try using a BNC coax
Ken,
Safety considerations are the reason for the spec requirement. You are
allowed to ground the shield at one point.
Try using a BNC coax connector with a built-in capacitor to ground. That
gives you an AC connection to ground and is often quite effective. These
are off-the-shelf parts.
Question for list members:
Background: I am troubleshooting a complex integration of military hardware
and COTS. One COTS piece of equipment has an RG-58 coaxial connection, but
the coax connector is an isolated feedthrough bnc. From a radiated
emissions point-of-view, that is hurting us.
I read in !emc-pstc that John Barnes jrbar...@iglou.com wrote (in
3e662c8b.7...@iglou.com) about 'VDE 0100 Part 253, VDE 0298 Part 4' on
Wed, 5 Mar 2003:
Do you know if there are any changes in the ampacity tables of BS 7671
between the 1992 and the 2001 editions?
I'm not sure about 2001, but
The FDA says the correct reference is 1002.31.
-Original Message-
From: WOODS, RICHARD
Sent: Wednesday, March 05, 2003 11:56 AM
To: 'emc-pstc'
Subject: FDA Laser Requirements
21CFR1002.30(b) refers to 1002.61 which does not exist. Does anyone know
the correct
I read in !emc-pstc that Bill Johnson bi...@kryotech.com wrote (in
e853e3e85cf50a4f88d6aa80d9ab2c01624...@mail.conterra.com) about 'Need
230VAC-115VAC 500VA Step-down Isolation Transformer with UL, cUL,
and CE' on Wed, 5 Mar 2003:
Any advice on where to look or how to select such a component
John,
Thank you for the tip on BS 7671. Techstreet wants $215 for BS
7671:2001, which is a bit too much for my budget when the ampacity
tables are all that I am looking for. (I've already ordered over $1017
in engineering books and standards this week-- my mailman is going to
hate me, having to
21CFR1002.30(b) refers to 1002.61 which does not exist. Does anyone know the
correct reference?
Richard Woods
Sensormatic Electronics
Tyco International
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Technical Committee emc-pstc discussion list.
Visit our web site at:
CONFLICT OF INTEREST NOTICE:
my employer makes component SMPSs
A common problem, often perceived as noise, is when the control loop of the
electronic load is operating at a beat frequency of one of the SMPS control
loops. I typically use a quality (X/Y-rated) cap from the load test-power
IEC825-1 and CDRH requirements are focused on the laser product and
incorporating provisions in the product for a safe installation. However,
they do not include much on the actual installation and use/human
interaction (other than for laser light shows). I recommend that you review
NFPA115 -
I read in !emc-pstc that John Barnes jrbar...@iglou.com wrote (in
3e64d54d.7...@iglou.com) about 'VDE 0100 Part 253, VDE 0298 Part 4' on
Tue, 4 Mar 2003:
I am researching the ampacity (current-carrying capacity, Leitung in
German) of wires for Appendix F of my book, Robust Electronic Design
Dear John:
Well, maybe not the ten millionth, but at least the umpteenth!
We are an A2LA Accredited Lab in Washington State ( in the quiet country
midway between Seattle and Vancouver, British Columbia). Wyle indeed works
here, and is quite proficient at EMI mitigation. During coffee breaks I
Dave:
I agree with your comments re: testing at 10 V/m, and then falling back to 3
V/m if there is a problem. This is a good way for a client to get almost
free margin-testing data. I recommend it often to our clients. If you
test to 3 V/m, you don't have a clue as to what would happen at 3.1
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