This message has been converted via the evaluation version of Transend Migrator. Use beyond the trial period specified in your Software Evaluation Agreement is prohibited. Please contact Transend Corporation at (650) 324-5370 or sales.i...@transend.com to obtain a license suitable for use in a production environment. Thank you. <br> ---------------------------------------------------------------------<br> The output of a Class 2/LPS circuit does not have the voltage or energy to be a shock or ignition risk as long as that voltage is used without any changes. I could design a circuit with an inverter and step-up transformer that would give me a hazardous voltage. The Class 2 limit is 100 W. In theory, I could get 1000 VAC RMS at 100 mA. Even with losses due efficiency limits, there would be enough current to kill somebody.
I will say that in general, if you are using a power supply that meets the 60950 LPS or the NEC Class 2 limits (they are basically the same) then you can hang circuits off the output without problems. However, it still needs to be investigated in a case by case basis. Ted Eckert APC-MGE http://www.apc.com/ The items contained in this e-mail reflect the personal opinions of the writer and are only provided for the assistance of the reader. The writer is not speaking in an official capacity for APC-MGE or Schneider Electric. The speaker does not represent APC-MGE's or Schneider Electric's official position on any matter. scott barrows <sbarrows9@yahoo. com> To Sent by: Curt McNamara <mcnam...@umn.edu>, emc-p...@ieee.org peter merguerian <pmerguerian2...@yahoo.com> cc 05/02/2008 07:10 Benoit Nadeau <bnad...@matrox.com>, AM EMC-PSTC <emc-p...@ieee.org> Subject Re: Safety regulations If the power supply is an NEC class 2 (vs a class II insulation system) or an LPS construction, then there is not enough current available to be a fire hazard. Scott Curt McNamara <mcnam...@umn.edu> wrote: What if a short occurred on one of these PCBs? Is there enough flammable material to constitute a fire hazard? Could a component get hot enough to melt connections and drop off, igniting material underneath the product? As you can see, there may be other cases to consider. Given that an event could initiate legal action, it may be wise to have a third party verify safety. Curt On May 1, 2008, at 10:37 PM, peter merguerian wrote: If the power supply is Listed/Certified Class 2 (power limited outputs) and there are no hazardous energy levels, I see no problems. Peter Merguerian Benoit Nadeau <bnad...@matrox.com> wrote: Bonjour, I’m much more fluent in EMC than safety and this is why I respectfully seek advice in this matter. I have a question coming from the designers and I’ve been looking in the US regulations (the NEC mainly) to find the answer but I didn’t. I think this is more like an interpretation than anything else. So the question is: If a PCB manufacturer buys a card cage that includes a fully listed power supply (approved by UL or CSA or ETL or any NRTL), and stuff this cage with his own PCBs (not listed) with no harmful external voltages or access to, and resell this as a whole new product. Can he put that on the market without having to re-list the new product as long as the markings on the power supply are still visible from outside the box? For me this would be like having an external Power Supply that feeds very low voltage to a box (like a laptop computer), Thank you for the time you are going to take to answer this. Regards, ========================================== Benoit Nadeau, ing. M.ing. Gérant du Groupe Conformité (Conformity Group Manager) Matrox 1055 boul. St-Régis Dorval (Québec) Canada H9P 2T4 Tél: (514) 822-6000 (2475) FAX: (514) 822-6275 bnad...@matrox.com www.matrox.com ========================================== - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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