Book Review
Has anyone read Emi/Emc Computational Modeling Handbook by Bruce Archambeault, Colin Brench, Omar M. Ramahi? If so, what did you think of the book and did it help you in predicting EMI effects? Allen Tudor, Compliance Engineer PairGain Technologies tel: (919)875-3382 6531 Meridien Drive fax: (919)876-1817 Raleigh, NC 27616 email: allen_tu...@pairgain.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
IEEE Atlanta EMC Society Meeting - June 1
The Atlanta Chapter of the IEEE EMC Society will be holding a meeting on June 1. The specifics are listed below: Topic: EMC For Medical Devices Speaker: Don Sherratt of Intertek Testing Services NA, Inc. List-Post: emc-pstc@listserv.ieee.org Date: Thursday, June 1, 2000 Time: 6:30 - 7:00 PM social (sandwiches) and meeting Place: Hampton Inn - Perimeter Center, 769 Hammond Drive, Atlanta, GA 30328 Hotel Phone: 404-303-0014. Hotel information and directions can be found at www.hampton-inn.com Speaker Information: Don Sherratt is Medical Stream Director for Intertek Testing Services NA, Inc. Don has worked in the Medical Equipment field since 1982 and has worked extensively in the area of research and development of a wide variety of medical device types. He has also given many presentations to UK Government institutions including Hospitals, Government Agencies, Universities and Colleges. Don holds two degrees, one in Electrical and Electronic Engineering and the other in Mechanical Engineering. These were gained in 1976 at the internationally acclaimed technical universities Napier and Herriot-Watt in Edinburgh. Both degrees were obtained with 1st Class Honours (1-1). Don joined Intertek Testing Services in 1993 and was responsible for setting up UK Notified Body 0359 for Medical Devices. Don is one of Europe's foremost experts in medical device technology and is a participant in Working Groups here in the USA and in Europe, including a replacement for EN60601-1. Don's current areas of expertise covers the product groups as follows: Ultrasound, X-ray Generators, MRI Systems, PET Systems, SPECT Systems, Physiotherapy products, Neuro monitoring, Isokinetics, Infant Care Systems, Breathing Apparatus, ECG/EKG, Lasers, HF Surgical Equipment, Cryogenic systems, Defibrillators, and Lithotriptors. EMC Society Information: David Dennis, Chapter Chair, phone: (678) 775-2435, email: dden...@itsqs.com Web Page: http://seal.gatech.edu/EEED/ieee-emc-atl (RSVP's are helpful for planning purposes, but not required) Non-IEEE EMC Society members are WELCOME! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re[2]: IEC 62151
forwarding for Lal Bahra Reply Separator Subject:Re: IEC 62151 Author: lal.ba...@us.ul.com List-Post: emc-pstc@listserv.ieee.org Date: 5/19/00 6:40 AM Hello to all of you: Yesterday when I replied to your E-mail, I typed the standard number IEC 62151 at some places and IEC 61251 at other places. My apologies. Following message contains the correct numbers. I just received a copy of IEC 62151. It is published May 2000. I found the following: There are new definitions the following: Hazardous-live-part: This is used in lieu of hazardous voltage in IEC 60950. Accessible: Same meaning as in IEC 60950 but it is defined in IEC 62151. TNV-0: Same as SELV in IEC 60950. Protective earthing: IEC 60950 does not have a definition but the same understanding. The only other difference is that IEC 62151 does not have the summation of touch currents which is covered in IEC 60950. This requirement primarily applies to PABX type equipment which may have hundreds or thousands of trunk lines. Equipment other than telecommunication equipment may never use this requirement. Thanks and best regards. Lal Bahra -- IEC 62151 has just been published. It replaces IEC guide 105. IEC 60950 has its own complete requirements for equipment connected to Telecommunication network. The requirements of IEC 62151 are based on the requirements of IEC 60950 except for minor differences in terminology. For example, in IEC 62151, SELV circuit is designated as a TNV-0 circuit. IEC 62151 is a basic safety publication and all IEC technical committees other than TC74, whose products have connections to the telecom network must use the requirements of IEC 62151 and make a reference to this standard unless they have a properly rationalized justification. TC 74 was given the task of writing the basic safety standard for Safety of Equipment electrically connected to a telecommunication network . This standard IEC 62151 covers only the interface to telecom network. The requirements of the end product standard apply to the product under consideration. EN41003 is a European Community standard and would have many differences from IEC 62151 just as it had differences from IEC 60950. IEC 62151 is similar to the telecom requirements of IEC 60950. Thanks and best regards. Lal Bahra Stefan Hipskind To: emc-p...@ieee.org cc: Jerilyn M. Merrill/NBK/ULI@ULI, Lal 05/18/00 Bahra/NBK/ULI@ULI 02:21 PM Subject: IEC 62151 To All, Opinions and answers fall below in red. All: I recently received an email notice of a new product safety standard: IEC 62151 Safety of equipment electrically connected to a telecommunication network. --How does this standard relate to IEC 950 / 60950? To my understanding it is used when product is not covered under UL1950, but has telecommunication circuitry. Closed loop systems is when you typically use IEC 62151. --Will it be used in conjunction with 950, or stand-alone? IEC 62151 is a stand alone. --Is this similar to / reminiscent of EN 41003? Unfortunately, I do not have an answer on this, you may wish to contact Mr. Lal Bahra at (847) 272-8800, Ext 43492 He is considered our leading authority on this standard and sits on the working group for the standard. Thanks in advance for the insights. Hope it helps. John Boucher Lucent Technologies Inc. Stefan Hipskind Underwriters Laboratories Account Executive, EMC e-mail stefan.hipsk...@us.ul.com Phone 1.847.272.8800, ext 42975 Fax 1.847.509.6311 Cell Phone 1.847.542.8736 - Forwarded by Stefan Hipskind/NBK/ULI on 05/18/00 02:12 PM - Boucher, John j...@bighorn.dr.lTo: 'emc-p...@ieee.org' ucent.comemc-p...@ieee.org Sent by: cc: owner-emc-pstc@ieebcc: e.org Subject: IEC 62151 05/18/00 11:29 AM Please respond to Boucher, John To All, Opinions and answers fall below in red. All: I recently received an email notice of a new product safety standard: IEC 62151 Safety of equipment electrically connected to a telecommunication network. --How does this standard relate to IEC 950 / 60950? To my understanding it is used when product is not covered under UL1950 (Medical, Vending, ) but has telecommunication circuitry. This is when you typically use IEC 62151. --Will it be used in conjunction with 950, or stand-alone? IEC 62151 is a stand alone. --Is this similar to / reminiscent of EN 41003? Unfortunately, I do not have an easy answer on this, you may wish to contact Mr. at (847)
Re:RE: Safety testing for 48 VDC powered ITE Equipment
forwarding for Ed Rauch. Reply Separator Subject:RE: Safety testing for 48 VDC powered ITE Equipment Author: ed.ra...@marconi.com List-Post: emc-pstc@listserv.ieee.org Date: 5/19/00 3:32 PM Also, your end customer could submit his equipment to UL 1950/ EN60950 and will need his components (your equipment) to be certified by a third party to be compliant to the standards. Grant, Tania (Tania) tgr...@lucent.com on 05/19/2000 01:27:25 PM Please respond to Grant, Tania (Tania) tgr...@lucent.com To: EMC-PSTC emc-p...@ieee.org, 'Andrews, Kurt' kandr...@tracewell.com cc:(bcc: Ed Rauch/MAIN/MC1) Subject: RE: Safety testing for 48 VDC powered ITE Equipment Kurt, Be careful.The LVD might exempt your equipment; however, if your 48 Vdc ITE has TNV connections, then you need to meet, per the old Telco or the new RTTE Directive, the essential requirements of safety, which are presumed to be met by compliance to EN60950. Alternatively, you can provide other proof that you meet the essential requirements.Believe me, it is easier to comply with EN60950 than provide this alternate proof!If your 48Vdc ITE equipment is NOT connected to TNV circuits then, by the book, you can consider it as falling outside the scope of the LVD.However, I believe that this is a foolish position to take;-- you should take a look at the European liability laws and then decide whether you want to hide under LVD dc limit exemption. The EN60950:1992, incorporating Amendments 1 through 5, states that it is applicable to mains-powered or battery-powered ITE, ...with a rated voltage not exceeding 600 V. Note that there is no mention of a minimum voltage, whether ac or dc. Thus, the ITE standard does not exempt you, however, the LVD does, assuming you want to take up this exemption. Tania Grant, tgr...@lucent.com mailto:tgr...@lucent.com Lucent Technologies, Intelligent Network Unit Messaging Solutions Group -- From: Andrews, Kurt [SMTP:kandr...@tracewell.com] Sent: Friday, May 19, 2000 10:04 AM To: EMC-PSTC Subject: Safety testing for 48 VDC powered ITE Equipment I'm looking for information as to what is required as far as safety testing for a piece of 48 VDC powered ITE Equipment. All outputs will be 12 VDC or less. This is a commercial unit and will not be sold to consumers. In Europe it would fall outside the scope of the LVD as it starts at 75V for DC powered equipment and this will be powered by 48 VDC. Does anyone know if there any other safety standards required in Europe for this type of equipment? It does appear that safety testing and listing is required by OSHA for use in a U.S. workplace. According to OSHA Standard 1910 Subpart S all electric utilization equipment is required to be approved which in most cases means Listing by a NRTL. In 1920.399 OSHA defines electric utilization equipment as equipment which uses electrical energy for mechanical, chemical, heating, lighting, or similar useful purpose. My interpretation of this is that any equipment which uses electricity, AC or DC, would need to be tested and Listed. Is my interpretation of the OSHA requirements correct? What about requirements for Canada? Any insights into these questions would be greatly appreciated. Thanks, Kurt Andrews Compliance Engineer Tracewell Systems, Inc. 567 Enterprise Dr. Westerville, OH 43081 Ph. 614-846-6175 Fax 614-846-7791 Email: kandr...@tracewell.com --- --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re:EMC_SAFETY_TAIWAN
forwarding for Juan Carlos Mora Reply Separator Subject:EMC_SAFETY_TAIWAN Author: jcm...@cetecom.com.tw (jcmora) List-Post: emc-pstc@listserv.ieee.org Date: 5/22/00 6:58 PM Dear Mr. Croning, Regarding your inquiries about Taiwan regulations, I'm working in Taiwan for the company CETECOM and think that I can help you. In general EMC and Safety requirements are not required for type approval in Taiwan related to telecommunication equipment. Only FAX machine must be tested against safety and EMC. For house hold application most of them must test for EMC and SAFETY. As you did not specify the type of product, I cannot send you the specific information you need. Anyway, further information please contact me or have a look at www.bsmi.gov.tw/english Best Regards Juan Carlos Mora --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
RE: Evaluation Boards
Vic, I am not sure whether you are providing a product or a service. Agencies control products;-- I am not aware that they are controlling services in the ITE product category. However, assuming that you want to perform due diligence with respect to what you are providing to your customers, I believe the question should be asked,-- how are your customers using these Evaluation Boards ?Are these boards just a convenient place to mount your chips?Is there any circuitry on these boards that enables your customers to run some tests? And if there is such circuitry, what would be the test platform? Assuming that the test platform is either a PC or some test and measurement equipment, and your circuitry is designed for that specific platform, and you want to encourage your customers to buy your chips rather than someone else's because they are so good and, most important, they meet the applicable EMC limits and safety requirements, then- * you test your Evaluation Boards in that platform to the appropriate standards. However, I am not sure that legally you are required to do all of the above. I hope that someone else can shed some better wisdom on this very interesting subject. Tania Grant, tgr...@lucent.com mailto:tgr...@lucent.com Lucent Technologies, Intelligent Network Unit Messaging Solutions Group -- From: Vic Gibling [SMTP:v...@virata.com] Sent: Monday, May 22, 2000 8:35 AM To: emc-p...@ieee.org Subject: Evaluation Boards Hi All As a chip manufacturer we provide Evaluation Boards to licencees for product development. I would appreciate any advice, guidance or comments regarding safety and emc issues with regard to these boards. Thank you. Vic Gibling v...@virata.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
RE: surge protection devices
Hi Muriel, I would start with IMHO UL1449 for U.S. and either EN60099-1 or IEC 1051 for Europe Hope this helps Eddie O'Toole ITS -Original Message- From: Muriel Bittencourt de Liz [mailto:mur...@grucad.ufsc.br] Sent: Monday, May 22, 2000 12:13 PM To: Lista de EMC da IEEE Subject: surge protection devices Hello Group, My doubt is on the question below: If I am a manufacturer of surge protection devices for cable TV networks, what standards should I comply with (IEC, ANSI, IEEE, etc.)??? Thanks in advance Muriel Florianópolis, Brasil --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: Safety: Hi-Pot Suppression for TNV lines
Chris, Usually the hi-pot tests done during the safety evaluation are meant to verify spacings and insulation. The hi-pot tests I have seen usually allow intentional paths to ground to be disconnected. It is the trace separation,etc, you are interested in, not how well the MOV conducts. Both MOV's are considered intentional paths to ground. Both should to be disconnected at the ground side during the test. If only one is disconnected, you may still have a path, whether it is direct, or through the contacts (open or closed) of the hookswitch. Eric Petitpierre Pulsecom Herndon, VA eric.petitpie...@pulse.com __ Reply Separator _ Subject: Safety: Hi-Pot Suppression for TNV lines Author: chr...@gnlp.com (Maxwell; Chris) at smtp List-Post: emc-pstc@listserv.ieee.org Date:5/22/00 10:33 AM Group, Is there an in-line adapter that we can install on a TNV line (in our case, a typical RJ12 phone line) to our product that will provide a second layer of hi-pot protection? The whole explanation follows for those who think they can help. Others can press delete right now and get on with their day. We produce a piece of fiber optic test equipment that is rack mounted and operates from 48VDC. Most of our typical equipment does not have TNV connections, however this does. We have designed a remote reset option. The remote reset consists of an RJ12 jack on the back of the unit. The user can plug a phone line into this jack. Once installed, the user can perform a 5 second power down on the unit by dialing the unit's phone number and letting the line ring 5 times. This has proved valuable to customers because the units are designed for remote installation. If the unit hangs up, they don't have to drive, fly, hike or swim out to where the unit is installed to perform a hard re-boot. This remote reset line only takes in the TIP and RING signals (the RJ12 only has pins 3 and 4 populated). Both TIP and RING have MOV's going to chassis ground. We have had the unit safety tested. During safety testing, the MOV's were cut (creating a single fault condition). When the MOV's were cut, the hipot test caused an arc to ground on a circuitboard within the unit. This arc was considered a failure. My guess is that the arc is caused by the fact that the tip and ring signals run close to a piece of the ground plane on the top layer of the board. My first stab at fixing this would be to clear out the ground plane so that it is furthur away from tip and ring. Now, even minor changes to circuitboards can cost thousands. It can also mean scrap. This unit is a very low volume product (hundreds annually). It may be more cost effective for us to add some sort of in-line suppressor external to the unit as opposed to revising the circuitboard. Given that the unit is rack mounted, I am assuming that there would be room in the rack to mount such a device, if it existed. Hence my question. Anybody have any ideas? Thank you for your time. Chris Maxwell, Design Engineer GN Nettest Optical Division 109 N. Genesee St. Utica, NY 13502 PH: 315-797-4449 FAX: 315-797-8024 EMAIL: chr...@gnlp.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
surge protection devices
Hello Group, My doubt is on the question below: If I am a manufacturer of surge protection devices for cable TV networks, what standards should I comply with (IEC, ANSI, IEEE, etc.)??? Thanks in advance Muriel Florianópolis, Brasil --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
RE: Hazardous Infrared radiation ?
Israel, Get yoursel;f a copy of EN 60825 (IEC 825) . . . that is a Laser Safety specifications and provides guidance on permissible limits for various wavelengths . . . Additionally, if you intend to ship to the US, reference 21 CFR 1040 (United States 'Code of Federal Regulations'). The CDRH (Center for Devices Radiological Health - an office of the FDA) is responsbile for compliance of laser products in the US. Here's the link for the CDRH and 21 CFR 1040 http://www.fda.gov/cdrh/radhlth/cfr/21cfr1040.10.pdf http://www.fda.gov/cdrh/ John Juhasz Fiber Options, Bohemia, NY -Original Message- From: Israel Yeshurun [mailto:israel_yeshu...@creoscitex.com] Sent: Monday, May 22, 2000 11:33 AM To: 'emc-p...@majordomo.ieee.org' Subject: Hazardous Infrared radiation ? Can some comment on this ? Can Infrared radiation (not Laser) be hazardous ? Obviously, high enough IR intensity should be hazardous. As the eye may not blink under exposure to IR (as the eye can not see it) the natural eye protection mechanism may not function. Any standards, guidelines available for permissible exposure limits to Infra red radiation ? Many thanks to every contribution ! with Best Regards, Israel Yeshurun. CreoScitex. Israel --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Compatabile DC Cable
Hi all I hope there is some one who can help me with this problem. We manufacture a outdoor LPD Transceiver and I need to find a power cable that is environmentally compatible (PVC or Polyethylene ?) with both US EU mandates! The power cable has a voltage of less than 48VDC and it must be capable of both indoors and outdoors use. Frank --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Evaluation Boards
Hi All As a chip manufacturer we provide Evaluation Boards to licencees for product development. I would appreciate any advice, guidance or comments regarding safety and emc issues with regard to these boards. Thank you. Vic Gibling v...@virata.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Hazardous Infrared radiation ?
Can some comment on this ? Can Infrared radiation (not Laser) be hazardous ? Obviously, high enough IR intensity should be hazardous. As the eye may not blink under exposure to IR (as the eye can not see it) the natural eye protection mechanism may not function. Any standards, guidelines available for permissible exposure limits to Infra red radiation ? Many thanks to every contribution ! with Best Regards, Israel Yeshurun. CreoScitex. Israel --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
RE: Hazardous Infrared radiation ?
The American Conference of Governmental Industrial Hygienists (ACGIH) lists recommended limits in their publication Threshold Limit Values for Chemical Substances and Physical Agents. The limits are for wave lengths of 770nm to 3um and are intended to protect the eye. Their web page is www.acgih.org http://www.acgih.org . Richard Woods -- From: Israel Yeshurun [SMTP:israel_yeshu...@creoscitex.com] Sent: Monday, May 22, 2000 11:33 AM To: 'emc-p...@majordomo.ieee.org' Subject: Hazardous Infrared radiation ? Can some comment on this ? Can Infrared radiation (not Laser) be hazardous ? Obviously, high enough IR intensity should be hazardous. As the eye may not blink under exposure to IR (as the eye can not see it) the natural eye protection mechanism may not function. Any standards, guidelines available for permissible exposure limits to Infra red radiation ? Many thanks to every contribution ! with Best Regards, Israel Yeshurun. CreoScitex. Israel --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Safety: Hi-Pot Suppression for TNV lines
Group, Is there an in-line adapter that we can install on a TNV line (in our case, a typical RJ12 phone line) to our product that will provide a second layer of hi-pot protection? The whole explanation follows for those who think they can help. Others can press delete right now and get on with their day. We produce a piece of fiber optic test equipment that is rack mounted and operates from 48VDC. Most of our typical equipment does not have TNV connections, however this does. We have designed a remote reset option. The remote reset consists of an RJ12 jack on the back of the unit. The user can plug a phone line into this jack. Once installed, the user can perform a 5 second power down on the unit by dialing the unit's phone number and letting the line ring 5 times. This has proved valuable to customers because the units are designed for remote installation. If the unit hangs up, they don't have to drive, fly, hike or swim out to where the unit is installed to perform a hard re-boot. This remote reset line only takes in the TIP and RING signals (the RJ12 only has pins 3 and 4 populated). Both TIP and RING have MOV's going to chassis ground. We have had the unit safety tested. During safety testing, the MOV's were cut (creating a single fault condition). When the MOV's were cut, the hipot test caused an arc to ground on a circuitboard within the unit. This arc was considered a failure. My guess is that the arc is caused by the fact that the tip and ring signals run close to a piece of the ground plane on the top layer of the board. My first stab at fixing this would be to clear out the ground plane so that it is furthur away from tip and ring. Now, even minor changes to circuitboards can cost thousands. It can also mean scrap. This unit is a very low volume product (hundreds annually). It may be more cost effective for us to add some sort of in-line suppressor external to the unit as opposed to revising the circuitboard. Given that the unit is rack mounted, I am assuming that there would be room in the rack to mount such a device, if it existed. Hence my question. Anybody have any ideas? Thank you for your time. Chris Maxwell, Design Engineer GN Nettest Optical Division 109 N. Genesee St. Utica, NY 13502 PH: 315-797-4449 FAX: 315-797-8024 EMAIL: chr...@gnlp.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: ANSI/TIA/EIA-603
Amund, try website http://www.tiaonline.org/standards/search.cfm?keyword=ANSI%2FTIA%2FEIA-603 regards, Paul Smith paul.j.sm...@teradyne.com Westin, Amund amund.wes...@dnv.com on 05/19/2000 11:40:57 AM Please respond to Westin, Amund amund.wes...@dnv.com To: 'emc-pstc' emc-p...@ieee.org cc:(bcc: Paul J Smith/Bos/Teradyne) Subject: ANSI/TIA/EIA-603 All, Any suggestion where I can get the ANSI/TIA/EIA-603 document ? Best regards Amund Westin Det Norske Veritas * amund.wes...@dnv.com ** Neither the confidentiality nor the integrity of this message can be guaranteed following transmission on the Internet. This message has been swept by MAILsweeper at DNV for the presence of computer viruses. ** --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Requirements For MOV's
I know this is a rehash of a topic from six months ago.. Sorry. I would like to find a break down of the requirements for MOV's ( this is only in AC mains applications) 1) By country (EU countries primarily.. But Globally is good info too.) 2) What safety markings ( on the device) are required? 3) What application limitations there are ; i.e. is Line-to-Line, vs. Line-to-Ground? 4) Are there national deviations regarding the application specifics? 5) What are the installation requirements? Any comments or direction on this would be appreciated. Regards David Spencer Xerox Corporation attachment: Spencer,_David_H.vcf
RE: Taiwan, information on EMC certification
John From memory originally this was a complicated process involving sending product to Taiwan with documentation in Chinese and this was the only way it could be done. However I believe this has now been relaxed and some mutual recognition has happened also I believe some of the test houses have representation out there and can help. Not much help I guess but I am sure others on the group will give you chapter and verse Regards Brian Harlowe -Original Message- From: John Cronin [SMTP:croni...@hotmail.com] Sent: 20 May 2000 23:40 To: emc-p...@ieee.org Subject:Taiwan, information on EMC certification Dear Group I have seen a number of messages regarding Taiwan in the newsgroup at one time or another. Unfortunately I ignored these on the assumption that I would never need them. Would you believe it, I now have a requirement to send equipment to Taiwan. I would be most obliged if anyone has saved a string on the subject or could refer me to the appropriate website. Many Thanks John Cronin Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
