RE: Potentially Explosive Atmospheres
Hi Ron, One set of warning guidelines exists in UL 913 (standard for intrinsically safe equipment) cl. 17doesn't address cell phone use specifically but directly addresses the batteries. NEC Article 500 invokes the need to address the fact that batteries in portable electronic equipment can become an ignition source in locations classified as hazardoussee the fine print notes in the various definition sections of Article 500. I'm betting the forum experts on Haz Loc might provide better references. Regards, Kaz Gawrzyjal kazimier_gawrzy...@dell.com -Original Message- From: ron_cher...@densolabs.com [mailto:ron_cher...@densolabs.com] Sent: Thursday, February 21, 2002 12:55 PM To: emc-p...@ieee.org Subject: Potentially Explosive Atmospheres Hi, I am trying to find in the UL specifications where a cell phone manual must contain a warning to the user on using the phone in a potentially explosive atmosphere. Thanks in advance, Ron Chernus Compliance Engineer, DENSO --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Flame rating
On Thu, 21 Feb 2002 14:03:59 +0100, Pierre SELVA \(eLABs\) e.l...@wanadoo.fr wrote: Can somebody remember me this classification using 5VA, 5VB, ... ? and what are the equivalence (if any) with the classification defined by UL94 ? I know the classification HB, V2, V1, V0, 5V, but I cannot find this new one, which is issued, I believe, from the 60590. I remember UL94-5V is now classified to 5VA and 5VB, and 5VA is those which will not have a hole after the burning test. Regards, Tom -- Tomonori Sato vef00...@nifty.ne.jp URL: http://member.nifty.ne.jp/tsato/ xvkbd-2.1 (virtual keyboard for X) available --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Potentially Explosive Atmospheres
This may seem like a dumb question, but how would a cellphone pose a hazard? I am unaware of anything in a cellphone that can cause any kind of a spark or arc that might start combustion in such an atmosphere. Certainly none of the keypad contacts could cause a problem. Bob Wilson TIR Systems Ltd. Vancouver. -Original Message- From: ron_cher...@densolabs.com [mailto:ron_cher...@densolabs.com] Sent: February 21, 2002 10:55 AM To: emc-p...@ieee.org Subject: Potentially Explosive Atmospheres Hi, I am trying to find in the UL specifications where a cell phone manual must contain a warning to the user on using the phone in a potentially explosive atmosphere. Thanks in advance, Ron Chernus Compliance Engineer, DENSO --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: 60950 SFC
We are required (by the standards, general morality, legal liability, etc) to ensure that products will remain 'safe' under worst case conditions. Hence we spend much soul-searching to evaluate and to test under 'worst-case' conditions. Fuzing in most countries is generally via a 16 A CB or fuze - hence this is used for testing. It is pretty hopeless if the power cord ignites BEFORE the fuze blows - so check out worst case (high, and low voltage) and worst place for short-circuits to maximuze the current - AND to maximize the let-through energy. In the UK domestic plugs can be fitted with fuzes between 1A and 13A - some manufacturers supply plugs with a 13A marking AND a 1A fuze. PLEASE check that you do not use this configuration - these are potential fire hazards waiting to happen. Best regards Gregg PLEASE NOTE: We are currently experiencing serious problems with our service provider PLEASE reply only to gr...@test4safety.com mailto:gr...@test4safety.com and ignore any reference to pgtv.net, Thank you. --Original Message- -From: owner-emc-p...@majordomo.ieee.org -[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Brian O'Connell -Sent: Friday, February 22, 2002 2:29 PM -To: emc-p...@ieee.org -Subject: 60950 SFC - - - -Good People of PSTC - -My notes from an agency (60950) seminar state that fault -conditions shall be -done with 16A installation fuses. I cannot find any clause in -EN60950:2000 -or UL60950, 3d Ed with this requirement. - -Is this test requirement in one the stds listed in 60950, or -am I blind? - -R/S, -Brian O'Connell -Taiyo Yuden (USA), Inc. - - -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/soc/emcs/pstc/ - -To cancel your subscription, send mail to: - majord...@ieee.org -with the single line: - unsubscribe emc-pstc - -For help, send mail to the list administrators: - Ron Pickard: emc-p...@hypercom.com - Dave Heald: davehe...@mediaone.net - -For policy questions, send mail to: - Richard Nute: ri...@ieee.org - Jim Bacher: j.bac...@ieee.org - -All emc-pstc postings are archived and searchable on the web at: -http://ieeepstc.mindcruiser.com/ -Click on browse and then emc-pstc mailing list - --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: 60950 SFC
I read in !emc-pstc that Brian O'Connell boconn...@t-yuden.com wrote (in f7e9180f6f7f5840858d3db815e4f7ad1f2...@cms21.t-yuden.com) about '60950 SFC', on Fri, 22 Feb 2002: My notes from an agency (60950) seminar state that fault conditions shall be done with 16A installation fuses. I cannot find any clause in EN60950:2000 or UL60950, 3d Ed with this requirement. Is this test requirement in one the stds listed in 60950, or am I blind? It is certainly inappropriate for UK. We have fused plugtops, 3 A, 5A, 10 A and 13 A, and ring circuits fused at 30 A or with MCBs at 32 A. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: AC 97
Darrell: With respect to your radiated emissions dilemna, useful information would be the clock speeds, cable lengths, and worst-case mode of operation at which emissions are the highest. Generally, if you invoke the divide and conquer rule, it should be an easier matter pinpointing the dominant sources of emissions. Regards, Jeffrey W. Greilich EMC Technical Manager Automotive Systems Laboratory, Inc. 27200 Haggerty Road, Suite B-12 Farmington Hills, MI 48331 (248) 848-2771 (Office) --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
60950 SFC
Good People of PSTC My notes from an agency (60950) seminar state that fault conditions shall be done with 16A installation fuses. I cannot find any clause in EN60950:2000 or UL60950, 3d Ed with this requirement. Is this test requirement in one the stds listed in 60950, or am I blind? R/S, Brian O'Connell Taiyo Yuden (USA), Inc. --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: AC 97
The source may be differential, but common mode currents generally contribute much more to radiated emissions, especially with cables... It sounds like you have cable radiation (100MHz) as well as maybe slot radiation (600MHz)... Tell us more about your device's test setup... (i.e. chassis and cabling details)... Paul Hare e: ph...@pirus.com Compliance Engineer w: 978.206.9179 Pirus Networks f: 978.206.9199 43 Nagog Park c: 508.450.0376 Acton, MA 01720 i: www.pirus.com -Original Message- From: Darrell Locke [mailto:dlo...@advanced-input.com] Sent: Friday, February 22, 2002 11:12 AM To: emc-p...@majordomo.ieee.org Subject: AC 97 Esteemed Colleages; Has anyone had experience using Audio-Codec '97 (AC 97) topology with respect to EMC performance. It is commonly used in PC sound cards. We have a device that incorporates this technology for voice recognition and are seeing very high emissions between 100-600 MHz. The offending RF noise source appears to be entirely differential. Thanks Darrell Locke Advanced Input Devices --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Different shades of UL
Well, just briefly. The backwards UR is a component recognition. It can be used in a end unit only if the conditions of acceptability that are placed in the UL report are met. E. G. Power supplies would have obvious things like the end use product must provide and adequate fire enclosure etc. Less obvious might be the requirement for a specific amount of airflow across the power supply itself - this one can bite the unwary. The UL in a circle indicates a Listed product - those products that are fully ready for a user. Plug it in and go. A computer for example. (Inside of which is probably a recognized power supply - which is now properly housed and cooled) Then there is the ULc which means its a listed product and evaluated to bi-national standards for the US and Canada. (CSA has a similar mark) There are actually other forms of markings as well, the words Underwriters Listed for example could be used instead of the UL in a circle thing. Then there are Classified items such as sheet rock, roofing materials etc. Haven't a clue what that marking looks like. I suppose there are variants that I haven't mentioned but these are the essentials to your question I believe. Gary -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Friday, February 22, 2002 6:40 AM To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: New China Compulsory Certification Scheme
Hello Rich et al, If you visit the Safety Link www.safetylink.com and click on the acronym CCC you will be taken to a page where the official documentation resides (pdf files, in English) and, there's no need to register to gain this valuable and useful information. And, the new China Compulsory Certification marking scheme was covered in the current issue of Int'l Product Safety News. If you'd like a copy (no-charge, snail-mail only), please provide your full contact details by return email - or click on the Free Trial button near the top of the Safety Link and fill out the form. Regards, Art Michael Int'l Product Safety News A.E. Michael, Editor 166 Congdon St. East P.O. Box 1561 Middletown CT 06457 U.S.A. Phone : (860) 344-1651 Fax: (860) 346-9066 Email : i...@safetylink.com Website: http://www.safetylink.com ISSN : 1040-7529 - On Thu, 21 Feb 2002 richwo...@tycoint.com wrote: Here is more information on the new scheme. http://www.esimcom.com/aak2_0_1_2/simcom_about/cccmark.asp --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Different shades of UL
A very quick and basic summary: Very roughly speaking, the UL marks can be interpretted as follows. (OK there are pages and pages of jargon attached to each but the quick messy answers are): the UL, UL listed and CUL listed products are those that have been tested at a UL test facility and passed the relevant applicable product tests (safety) for such a device. The CUL denotes listing is acceptable to UL and harmonised Canadian standards. The list info and file will outline the standard applied (maybe UL1950 / UL60950) and models of the equipment covered. Such listed devices are manufactured at UL inspected factory facilities. The mirror image logo is applied to components and parts for which UL have a manufacturing scheme. This means parts marked with the logo have been tested using UL inspected methods and under a UL checked quality system. This could be on a cable such a a VW-1 rated cord or a PCB with V0 Rating etc. Adopting logo marked parts for use in a UL listed product makes for easier tracability of critical components. There is also a UL listed Accessory which is for devices intended to be installed in a host (like a card for a PC). This is like the UL, CUL mark but requires installation instructions as part of the assessment. Hope this helps: Bill Ellingford Approvals and Compliance manager Motion Media Technology -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: 22 February 2002 14:40 To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list * --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Different shades of UL
You don't know the half of it. Check out the following: http://www.ul.com/mark/ Best regards, Brian Epstein Sr Regulatory Compliance Engineer Veeco Metrology 112 Robin Hill Rd Santa Barbara CA 93117 805-967-2700 x2315 brian.epst...@veeco.com mailto:brian.epst...@veeco.com -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Friday, February 22, 2002 6:40 AM To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Different shades of UL
Chris Here is a great link that describes the different UL marks. http://www.ul.com/mark/index.html Kati Wenzel -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Friday, February 22, 2002 8:40 AM To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Different shades of UL
Chris: you probably will get this question answered by many people. go to the following link and you will find all you need http://www.ul.com/mark/index.html Jim Allan Manager, Engineering Services Kentrox LLC 1619 N Harrison Parkway Sunrise, FL, 33323 E-mail james_al...@milgo.com Phone (954) 846-3720 Fax (954) 846-6282 -Original Message- From: Chris Maxwell [SMTP:chris.maxw...@nettest.com] Sent: Friday, February 22, 2002 9:40 AM To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Different shades of UL
UL has a page entitled UL's Marks -- What they look like and what they mean http://www.ul.com/mark/ Richard Woods Sensormatic Electronics Tyco International -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Friday, February 22, 2002 9:40 AM To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Different shades of UL
Chris, See attached link which might be helpful to you. The information may be found in UL's site http://www.ul.com TGIF! PETER S. MERGUERIAN Technical Director I.T.L. (Product Testing) Ltd. 26 Hacharoshet St., POB 211 Or Yehuda 60251, Israel Tel: + 972-(0)3-5339022 Fax: + 972-(0)3-5339019 Mobile: + 972-(0)54-838175 http://www.itl.co.il http://www.i-spec.com -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Friday, February 22, 2002 4:40 PM To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list The UL Mark.htm Description: Binary data
RE: Different shades of UL
Chris, Your best bet is to get it from the source at: http://www.ul.com/mark/ Best regards, Dave Lorusso Director of Product Integrity General Bandwidth, Inc. 12303 Technology Blvd. Austin, TX 78727 512-681-5480 (phone) 512-681-5481 (fax) dave.loru...@genband.com www.genband.com -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Friday, February 22, 2002 8:40 AM To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Different shades of UL
Chris Try this web address, it explains all the various UL marks and what they mean. http://www.ul.com/mark/index.html Andrew Carson - Senior Compliance Engineer, Xyratex, UK Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014 -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: 22 February 2002 14:40 To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Different shades of UL
Chris, Go to the following site and it explains it very well with examples. http://www.ul.com/mark/index.html The information not covered are the : product type (e.g., I.T.E.) (there is a lot of variation allowed here), 4 character Listing Mark Control Number (LMCN) which is a confidential ID for the applicant, UL file number when appropriate, use of the word Accessory or similar when appropriate, The use of the LMCN and UL File Number is determined by who the Applicant and Listee are and who's name is on the power rating label. Also the little detail that the text must be in all Caps and Bold. Oscar M.O.O. Chris Maxwell chris.maxw...@nettest.com@majordomo.ieee.org on 02/22/2002 09:39:52 AM Please respond to Chris Maxwell chris.maxw...@nettest.com Sent by: owner-emc-p...@majordomo.ieee.org To: EMC-PSTC Internet Forum emc-p...@majordomo.ieee.org cc: Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
AC 97
Esteemed Colleages; Has anyone had experience using Audio-Codec '97 (AC 97) topology with respect to EMC performance. It is commonly used in PC sound cards. We have a device that incorporates this technology for voice recognition and are seeing very high emissions between 100-600 MHz. The offending RF noise source appears to be entirely differential. Thanks Darrell Locke Advanced Input Devices --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Different shades of UL
Chris, The RU is the Recognized mark. It is applicable to products that are incomplete in construction features or limited performance capabilities so as not to warrant their acceptability as a field installed component. This mark does not look like a UL mark because it is not for public or retail use. If this mark is displayed on a retail advertisement or package it is not proper use of the mark. UL in a circle is the Listing Mark. It is authorized on products that comply with the requirements of UL. UL in a Circle with a C at the lower right signifies products that have been tested by UL to the Canadian requirements. Of course UL in a circle with US at the lower left and C at the lower right signifies products that have been tested by UL to the UL requirements and the Canadian requirements. UL in a circle with the word Classified around the top of the circle signifies products that are classified with respect to: a: properties of the product b: A limited spectrum of hazards to life or property c: suitability for certain uses or d: other conditions. Note: there are other, little used, marks with the words Underwriters Laboratories written out that also mean Listed Lee Schmitz Consultant --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Different shades of UL
Hi Chris, Explain, no. But, you will find the answer to your question at: http://www.ul.com/mark/index.html There, you should be able to find every kind of UL mark, and then some. Each has has a short description. I hope this helps. Best regards, Ron Pickard rpick...@hypercom.com chris.maxwell@NetTest.c om To: emc-p...@majordomo.ieee.org Sent by: cc: owner-emc-pstc@majordomSubject: Different shades of UL o.ieee.org 02/22/02 07:39 AM Please respond to chris.maxwell Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Different shades of UL
try this Chris. It'll explain all. http://www.ul.com/mark/index.html John Juhasz Fiber Options Bohemia, NY -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Friday, February 22, 2002 9:40 AM To: EMC-PSTC Internet Forum Subject: Different shades of UL Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Use of PCB Traces as Fuse and Voltage suppressor
Gas discharge tubes can be very complex devices and have a number of specifications. Normally the voltage spec that you see is the DC specification, in other words, the firing voltage if the voltage is slowly ramped up (2kV/second is on rate used); however, the impulse voltage -- the voltage at which the tube fires with a fast pulse (anywhere from 100V/us to 10kV/us) is normally much higher. One of the objectives in gas tube design is to get the DC and impulse voltages to be as consistent as possible, and as close together as possible (actually very difficult). Gas mixtures, doping, electrode geometry, etc. are all critical to the design. Some gas is sensitive to light, some work better in the light and for a while, some were doped with radioactivity to help control the firing point under different voltage impulse conditions. Hope this helps Nothing's ever simple. Best Regards, Mike Hopkins Thermo KeyTek. -Original Message- From: Robert Macy [mailto:m...@california.com] Sent: Wednesday, February 20, 2002 7:18 PM To: Chris Maxwell; bogda...@pacbell.net Cc: EMC-PSTC Internet Forum Subject: Re: Use of PCB Traces as Fuse and Voltage suppressor Our experience with gas discharge tubes was that they worked according to spec in the lab. fired perfectly around 400V like they're supposed to, but down inside of the PVC oil tank holding the 150KV isolation transformer they liked to fire at 600V+ Guess they needed photon energy to make the gas trigger or something. - Robert - Robert A. Macy, PEm...@california.com 408 286 3985 fx 408 297 9121 AJM International Electronics Consultants 619 North First St, San Jose, CA 95112 -Original Message- From: Chris Maxwell chris.maxw...@nettest.com To: bogda...@pacbell.net bogda...@pacbell.net Cc: EMC-PSTC Internet Forum emc-p...@majordomo.ieee.org List-Post: emc-pstc@listserv.ieee.org Date: Wednesday, February 20, 2002 2:15 PM Subject: RE: Use of PCB Traces as Fuse and Voltage suppressor Hi Bogdan, I'm sorry if you thought that my previous message was an endorsement for using necked down PCB traces as a fuse. I understand and share the sentiment that it is an unpredictable and probably not even cost effective solution. I was wondering why anyone would shape a PCB trace in such a way (two triangles pointing at each other with a thin trace between the points). A fuse is probably not the likely intention. A reasonable explanation may be a cut jumper. The triangles make the trace visible; while the thin trace provides an easy spot for the trace to be cut with an exacto knife which permanently removes the jumper.Another reason (suggested by a colleage) are alignment marks used by the PCB fab house to help align layers. Just to be sure... I'm not suggesting the above as design ideas. I'm just trying to figure out why anyone would do such a thing. One solution to the original problem that I haven't seen suggested is the good old air discharge tube, gas-discharge tube, gas tube ...whatever you want to call them. Of course, they aren't free (about $1 each). They are more predictable than open air terminals, they are UL/CSA recognized and they can handle some massive breakdown currents. They are available from Bourns and Sankosha USA... probably some other manufacturers as well. Chris -Original Message- From: bogdan matoga [SMTP:bogda...@pacbell.net] Sent: Wednesday, February 20, 2002 4:19 PM To: gab...@simex.ca; Chris Maxwell; emc-p...@mahordomo.ieee.org Subject: Use of PCB Traces as Fuse and Voltage suppressor Gabi: I believe that there is a basic rule which is not published anywhere: when you design something, then do it right. When transient suppressors are needed, then use the correct component, which will not depend on Paschen's Law and give predictable performance. Same for necked down fuses. When you want performance, then do it right. The above original suggestions are perfect for Mickey-Mouse-engineering. Bogdan. --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit
Different shades of UL
Hi all, I know that this has been covered before. But please indulge my ignorance. There are many different forms of UL marks, each with subtle differences. There is the UL in a circle. There is also the mirror lettered RU. There are also some subscripts denoting approval for Canada as well. There may be some other variations that I can't remember. Anyone care to blow a few minutes on a Friday afternoon to explain which symbol means what? Thanks, Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Potentially Explosive Atmospheres
Robert Any radio source can prove hazardous in explosive atmospheres. Metal work of the right shape and size can act as an antenna, then all that is required is momentary discontinuity, or a momentary return path to ground and a spark will form. The petrochemical industrial have been aware of this problem for a long time and a draft EN standard is in progress regarding RF fields in proximity to areas with explosive atmospheres. I do not know about the rest of the world, but in the UK petrol stations have big signs saying, Switch of ignition. No Smoking, No Cell Phones. Although today's low powered phones are unlikely to cause a spark to form. Andrew Carson - Senior Compliance Engineer, Xyratex, UK Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014 -Original Message- From: Robert Wilson [mailto:robert_wil...@tirsys.com] Sent: 22 February 2002 00:04 To: emc-p...@ieee.org Subject: RE: Potentially Explosive Atmospheres This may seem like a dumb question, but how would a cellphone pose a hazard? I am unaware of anything in a cellphone that can cause any kind of a spark or arc that might start combustion in such an atmosphere. Certainly none of the keypad contacts could cause a problem. Bob Wilson TIR Systems Ltd. Vancouver. -Original Message- From: ron_cher...@densolabs.com [mailto:ron_cher...@densolabs.com] Sent: February 21, 2002 10:55 AM To: emc-p...@ieee.org Subject: Potentially Explosive Atmospheres Hi, I am trying to find in the UL specifications where a cell phone manual must contain a warning to the user on using the phone in a potentially explosive atmosphere. Thanks in advance, Ron Chernus Compliance Engineer, DENSO --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
