RE: HiPot testing of DC mains powered products
Rich - While I can't speak for Chris, there are a few reasons to perform production line ESTs on 48V dc mains powered equipment. 1) in 48Vdc SMPSs, the voltages present on transformer insulation are typically in excess of ELV limits. If the power supply has had fault testing performed that clearly indicates hazardous voltages are not presented at the outputs, there may be reason to waive an input-to-output production line EST. 2) unless the design and documentation explicitly address electrical bonding of the chassis to the battery return terminal in the equipment (refer to CSA/UL60950, Annex NAB and related information in Annex NAA), demonstration of electrical separation of battery return and chassis (protective earthing) is necessary. 3) quality control issues 4) customer requirements Regards, Peter L. Tarver, PE Product Safety Manager Sanmina Homologation Services peter.tar...@sanmina.com > From: Rich Nute > > Hi Chris: > > > I wonder why you need to hi-pot test a SELV-powered > product? (I presume your external 48-volt dc source > is SELV.) > > We make products intended for connection to an external > dc source (SELV). We have never been required to > perform a hi-pot test on such products. > > The production-line hi-pot is a test that tests the > insulation between the two input leads (in parallel) > and the chassis (or accessible metal). The insulation > provides protection against electric shock. Since no > electric shock is possible from 48 V dc (according to > the standards), then there is no requirement for the > insulation to withstand the transient overvoltages (if > any) on the dc mains. Indeed, if the insulation were > to fail, there would be no electric shock. > > > Best regards, > Rich > --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: HiPot testing of DC mains powered products
I agree with Rich. Appendix D of your UL report or procedure has Exceptions to the standard dielectric and ground continuity tests done by the manufacturer. In my case I have 4 products which do not require either of these tests. I'd take a quick glance in your procedure. Gary -Original Message- From: Rich Nute [mailto:ri...@sdd.hp.com] Sent: Monday, November 12, 2001 4:34 PM To: chris.maxw...@nettest.com Cc: emc-p...@majordomo.ieee.org Subject: Re: HiPot testing of DC mains powered products Hi Chris: I wonder why you need to hi-pot test a SELV-powered product? (I presume your external 48-volt dc source is SELV.) We make products intended for connection to an external dc source (SELV). We have never been required to perform a hi-pot test on such products. The production-line hi-pot is a test that tests the insulation between the two input leads (in parallel) and the chassis (or accessible metal). The insulation provides protection against electric shock. Since no electric shock is possible from 48 V dc (according to the standards), then there is no requirement for the insulation to withstand the transient overvoltages (if any) on the dc mains. Indeed, if the insulation were to fail, there would be no electric shock. Best regards, Rich --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server. --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: HiPot testing of DC mains powered products
Hi Chris: I wonder why you need to hi-pot test a SELV-powered product? (I presume your external 48-volt dc source is SELV.) We make products intended for connection to an external dc source (SELV). We have never been required to perform a hi-pot test on such products. The production-line hi-pot is a test that tests the insulation between the two input leads (in parallel) and the chassis (or accessible metal). The insulation provides protection against electric shock. Since no electric shock is possible from 48 V dc (according to the standards), then there is no requirement for the insulation to withstand the transient overvoltages (if any) on the dc mains. Indeed, if the insulation were to fail, there would be no electric shock. Best regards, Rich --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
Fire safety. Was RE: HiPot testing of DC mains powered products
Hi Chris, I understand it may be an agency requirement to hipot, but I am not sure that a hipot test would necessarily reveal potential insulation failures/faults that would lead to the type of hazard you indicated. Surely these hazards have already been addressed in the design/type-testing phase? Enci At 15:22 06/11/01 -0500, "Chris Maxwell" wrote: >Your answer would be a possibility for "self-certification" cases. >However, if we want to use an NRTL mark such as UL, TUV, CSA ...; then >the agency will dictate whether or not to hipot. My understanding is >that such agencies will require hipot on products even if they are rated >48VDC (which may be considered SELV) as long as the products use more >than a minimum power level. My understanding is that the power level is >around 15Watts. > >I believe that the reasoning behind this has more to do with fire safety >than shock safety. Any product that draws more than a certain power >level (again I think that about 15 Watts is the cutoff) from a DC mains >(i.e. station battery ...) is considered a definite power/energy/fire >hazard...thus the hipot requirements. --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: HiPot testing of DC mains powered products
Chris, You should test the unit including your custom cable assembly as a complete system. For a 48 V niminal product, the voltage is 700 Vdc for min. 1 second. This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use, disseminate, distribute, copy or rely upon this message or attachment in any way. If you received this e-mail message in error, please return by forwarding the message and its attachments to the sender. 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 -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Tuesday, November 06, 2001 5:36 PM To: EMC-PSTC Internet Forum Subject: HiPot testing of DC mains powered products Hi all, I have a question. I have a 48VDC powered product which will be hipot and ground continuity tested off of the production line in order to maintain agency certification. The product uses D-shaped three pin power connector. (Same size as a DB15, but has three large power pins instead of 15 signal pins). When we sell the unit, we pack it with an accessory kit which includes a 15' cable assembly terminated with the mate to the product's power connector. So, essentially, we sell the unit with a "DC mains" cable that we make. Now, where should the hipot test be performed? Should I make a test cable assembly for the hipot/ground bond tester which is terminated with the proper connector so that the tester can plug directly into the chassis? This would essentially test the chassis only. (because we would use this same test cable for every unit) Or Should I take each unit and connect the DC mains cable to be shipped with it, then apply the hipot/ground bond probes to the other end of the DC mains cable? This would test the entire system including the chassis and the cable. In my mind, this question comes up because we are making a custom mains cable for this DC product. It is different than AC products; because, with AC products, we can test the chassis by itself and assume that the mains cable is OK because we buy mains cables that have been previously hipot/ground bond tested by their manufacturers. Any words of wisdom? 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server. --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: HiPot testing of DC mains powered products
Chris, In my opinion you should perform the test with the cable that you ship. Your explanation for the second scenario states exactly why this should be done. Scott Lacey -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Chris Maxwell Sent: Tuesday, November 06, 2001 10:36 AM To: EMC-PSTC Internet Forum Subject: HiPot testing of DC mains powered products Hi all, I have a question. I have a 48VDC powered product which will be hipot and ground continuity tested off of the production line in order to maintain agency certification. The product uses D-shaped three pin power connector. (Same size as a DB15, but has three large power pins instead of 15 signal pins). When we sell the unit, we pack it with an accessory kit which includes a 15' cable assembly terminated with the mate to the product's power connector. So, essentially, we sell the unit with a "DC mains" cable that we make. Now, where should the hipot test be performed? Should I make a test cable assembly for the hipot/ground bond tester which is terminated with the proper connector so that the tester can plug directly into the chassis? This would essentially test the chassis only. (because we would use this same test cable for every unit) Or Should I take each unit and connect the DC mains cable to be shipped with it, then apply the hipot/ground bond probes to the other end of the DC mains cable? This would test the entire system including the chassis and the cable. In my mind, this question comes up because we are making a custom mains cable for this DC product. It is different than AC products; because, with AC products, we can test the chassis by itself and assume that the mains cable is OK because we buy mains cables that have been previously hipot/ground bond tested by their manufacturers. Any words of wisdom? 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server. --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: HiPot testing of DC mains powered products
Hi David, It's good to hear from someone who has spent a couple of second shifts out in the cold 10m test site with me. Hope all is going well. Your answer would be a possibility for "self-certification" cases. However, if we want to use an NRTL mark such as UL, TUV, CSA ...; then the agency will dictate whether or not to hipot. My understanding is that such agencies will require hipot on products even if they are rated 48VDC (which may be considered SELV) as long as the products use more than a minimum power level. My understanding is that the power level is around 15Watts. I believe that the reasoning behind this has more to do with fire safety than shock safety. Any product that draws more than a certain power level (again I think that about 15 Watts is the cutoff) from a DC mains (i.e. station battery ...) is considered a definite power/energy/fire hazard...thus the hipot requirements. Just a little background...I assume that the test report for this product will specify the testing required; but I wanted to get a feel for what others were doing or would do in the same situation. Chris > -Original Message- > From: David Heald [SMTP:davehe...@mediaone.net] > Sent: Tuesday, November 06, 2001 3:08 PM > To: Chris Maxwell > Cc: EMC-PSTC Internet Forum > Subject: Re: HiPot testing of DC mains powered products > > Chris, > Greetings! You may not even need to perform production line hipot > if > the unit is a fiber only product. Since the mains are SELV (unless > you > are shipping to certain Euro Telco's) the only time you should need > production line hipot is if you have wired (TNV-2 or TNV-3) > interfaces, > assuming no other connections to hazardous circuits. > > Granted my advice may be flawed as I am used to permanently connected, > stationary, restricted access location products that are a far cry > from > portable equipment as far as safety standards go. > > Best Regards, > Dave Heald > > > Chris Maxwell wrote: > > > > Hi all, > > > > I have a question. > > > > I have a 48VDC powered product which will be hipot and ground > continuity > > tested off of the production line in order to maintain agency > > certification. > > > > The product uses D-shaped three pin power connector. (Same size as > a > > DB15, but has three large power pins instead of 15 signal pins). > > > > When we sell the unit, we pack it with an accessory kit which > includes a > > 15' cable assembly terminated with the mate to the product's power > > connector. So, essentially, we sell the unit with a "DC mains" > cable > > that we make. > > > > Now, where should the hipot test be performed? > > > > Should I make a test cable assembly for the hipot/ground bond tester > > which is terminated with the proper connector so that the tester can > > plug directly into the chassis? This would essentially test the > chassis > > only. (because we would use this same test cable for every unit) > > > > Or > > > > Should I take each unit and connect the DC mains cable to be shipped > > with it, then apply the hipot/ground bond probes to the other end of > the > > DC mains cable? This would test the entire system including the > chassis > > and the cable. > > > > In my mind, this question comes up because we are making a custom > mains > > cable for this DC product. > > > > It is different than AC products; because, with AC products, we can > test > > the chassis by itself and assume that the mains cable is OK because > we > > buy mains cables that have been previously hipot/ground bond tested > by > > their manufacturers. > > > > Any words of wisdom? > > > > 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: > > Michael Garretson:pstc_ad...@garretson.org > > Dave Healddavehe...@mediaone.net >
Re: HiPot testing of DC mains powered products
Chris, Greetings! You may not even need to perform production line hipot if the unit is a fiber only product. Since the mains are SELV (unless you are shipping to certain Euro Telco's) the only time you should need production line hipot is if you have wired (TNV-2 or TNV-3) interfaces, assuming no other connections to hazardous circuits. Granted my advice may be flawed as I am used to permanently connected, stationary, restricted access location products that are a far cry from portable equipment as far as safety standards go. Best Regards, Dave Heald Chris Maxwell wrote: > > Hi all, > > I have a question. > > I have a 48VDC powered product which will be hipot and ground continuity > tested off of the production line in order to maintain agency > certification. > > The product uses D-shaped three pin power connector. (Same size as a > DB15, but has three large power pins instead of 15 signal pins). > > When we sell the unit, we pack it with an accessory kit which includes a > 15' cable assembly terminated with the mate to the product's power > connector. So, essentially, we sell the unit with a "DC mains" cable > that we make. > > Now, where should the hipot test be performed? > > Should I make a test cable assembly for the hipot/ground bond tester > which is terminated with the proper connector so that the tester can > plug directly into the chassis? This would essentially test the chassis > only. (because we would use this same test cable for every unit) > > Or > > Should I take each unit and connect the DC mains cable to be shipped > with it, then apply the hipot/ground bond probes to the other end of the > DC mains cable? This would test the entire system including the chassis > and the cable. > > In my mind, this question comes up because we are making a custom mains > cable for this DC product. > > It is different than AC products; because, with AC products, we can test > the chassis by itself and assume that the mains cable is OK because we > buy mains cables that have been previously hipot/ground bond tested by > their manufacturers. > > Any words of wisdom? > > 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: > Michael Garretson:pstc_ad...@garretson.org > Dave Healddavehe...@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: > No longer online until our new server is brought online and the old > messages are imported into the new server. --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: HiPot testing of DC mains powered products
Chris, The reason that I agree with John that you should be testing both is that the custom DC cable that you are assembling and shipping with your product can have marginal or failed insulation that the hi-pot test would catch. Such potential failures can have spectacular results at your customers' installation. Consider that every UL Listed/CSA Certified (ac) cordset is 100% hi-pot tested at the manufacturing location, for very good reasons. You should do no less. taniagr...@msn.com - Original Message - From: John Juhasz Sent: Tuesday, November 06, 2001 10:15 AM To: 'Chris Maxwell'; EMC-PSTC Internet Forum Subject: RE: HiPot testing of DC mains powered products If you conduct the functional tests of the chassis with the DC cable that ships with it, then it's not much of a hassle and you know that the whole package is fine. If you merely insert the cable during packing for shipment, consider doing a hi-pot on the cable itself on it's production line. Personally, I would prefer to test both, whether it was together or not. John Juhasz Fiber Options Bohemia, NY -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Tuesday, November 06, 2001 10:36 AM To: EMC-PSTC Internet Forum Subject: HiPot testing of DC mains powered products Hi all, I have a question. I have a 48VDC powered product which will be hipot and ground continuity tested off of the production line in order to maintain agency certification. The product uses D-shaped three pin power connector. (Same size as a DB15, but has three large power pins instead of 15 signal pins). When we sell the unit, we pack it with an accessory kit which includes a 15' cable assembly terminated with the mate to the product's power connector. So, essentially, we sell the unit with a "DC mains" cable that we make. Now, where should the hipot test be performed? Should I make a test cable assembly for the hipot/ground bond tester which is terminated with the proper connector so that the tester can plug directly into the chassis? This would essentially test the chassis only. (because we would use this same test cable for every unit) Or Should I take each unit and connect the DC mains cable to be shipped with it, then apply the hipot/ground bond probes to the other end of the DC mains cable? This would test the entire system including the chassis and the cable. In my mind, this question comes up because we are making a custom mains cable for this DC product. It is different than AC products; because, with AC products, we can test the chassis by itself and assume that the mains cable is OK because we buy mains cables that have been previously hipot/ground bond tested by their manufacturers. Any words of wisdom? 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.. --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: HiPot testing of DC mains powered products
If you conduct the functional tests of the chassis with the DC cable that ships with it, then it's not much of a hassle and you know that the whole package is fine. If you merely insert the cable during packing for shipment, consider doing a hi-pot on the cable itself on it's production line. Personally, I would prefer to test both, whether it was together or not. John Juhasz Fiber Options Bohemia, NY -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Tuesday, November 06, 2001 10:36 AM To: EMC-PSTC Internet Forum Subject: HiPot testing of DC mains powered products Hi all, I have a question. I have a 48VDC powered product which will be hipot and ground continuity tested off of the production line in order to maintain agency certification. The product uses D-shaped three pin power connector. (Same size as a DB15, but has three large power pins instead of 15 signal pins). When we sell the unit, we pack it with an accessory kit which includes a 15' cable assembly terminated with the mate to the product's power connector. So, essentially, we sell the unit with a "DC mains" cable that we make. Now, where should the hipot test be performed? Should I make a test cable assembly for the hipot/ground bond tester which is terminated with the proper connector so that the tester can plug directly into the chassis? This would essentially test the chassis only. (because we would use this same test cable for every unit) Or Should I take each unit and connect the DC mains cable to be shipped with it, then apply the hipot/ground bond probes to the other end of the DC mains cable? This would test the entire system including the chassis and the cable. In my mind, this question comes up because we are making a custom mains cable for this DC product. It is different than AC products; because, with AC products, we can test the chassis by itself and assume that the mains cable is OK because we buy mains cables that have been previously hipot/ground bond tested by their manufacturers. Any words of wisdom? 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.. --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
HiPot testing of DC mains powered products
Hi all, I have a question. I have a 48VDC powered product which will be hipot and ground continuity tested off of the production line in order to maintain agency certification. The product uses D-shaped three pin power connector. (Same size as a DB15, but has three large power pins instead of 15 signal pins). When we sell the unit, we pack it with an accessory kit which includes a 15' cable assembly terminated with the mate to the product's power connector. So, essentially, we sell the unit with a "DC mains" cable that we make. Now, where should the hipot test be performed? Should I make a test cable assembly for the hipot/ground bond tester which is terminated with the proper connector so that the tester can plug directly into the chassis? This would essentially test the chassis only. (because we would use this same test cable for every unit) Or Should I take each unit and connect the DC mains cable to be shipped with it, then apply the hipot/ground bond probes to the other end of the DC mains cable? This would test the entire system including the chassis and the cable. In my mind, this question comes up because we are making a custom mains cable for this DC product. It is different than AC products; because, with AC products, we can test the chassis by itself and assume that the mains cable is OK because we buy mains cables that have been previously hipot/ground bond tested by their manufacturers. Any words of wisdom? 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
