Christine,
As I and others have stated, the LPS requirement comes from IEC/EN/UL/etc 60950-1 safety standards, but this is of course assuming that 60950-1 is the safety standard that that manufacturer employed, which may not be acceptable to your product’s safety requirements. And as others have indicated, you will probably need to address other issues in your product if that new power supply is not LPS regardless. The addition of that new power supply will probably not be as simple as you might have envisioned. So, get a copy of the new power supply’s safety report(s), validate LPS (or not), and work with your NRTL & CB NCB to determine what you need to do to make the new power supply acceptable for your product. Your product’s safety reports will likely need to be updated to reflect the new power supply anyway. IHTH. Best regards, Ron Pickard ron.pick...@intermec.com <mailto:ron.pick...@intermec.com> ________________________________ From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Christine Rodham Sent: Wednesday, January 21, 2009 2:38 PM To: emc-p...@ieee.org Subject: Re: Safety Experts: Limited Voltage Pwr Supplies vs. Non-Limited Voltage Power Supplies List Members, Thanks for all the great replies! Would it make sense to see if the end product can pass safety with the non-LPS power supply? Is the the LPS clause just a CB scheme requirement or is it required for NRTL approval also? Best regards, Christine Rodham Christine Rodham <chrisrod...@yahoo.com> wrote: Hi List Members, We have a vendor that provides us a unit that uses an external power supply ( 90- 240VAC) The power supply is labeled LPS after the model number which means: Limited Voltage Power Supply. They recently changed vendors to another power supply with the EXACT same rating Except it was not marked as a LIMITED voltage power supply. Our supplier says this is not a compliance / safety issue because both supplies are recognized by UL and have the same voltage and current rating. So the $64,0000 dollar question is can you use a non- LPS in place of a LPS if they have the same rating? Thanks in advance, Thank you in advance! Christine Rodham - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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 <dhe...@gmail.com> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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 <dhe...@gmail.com> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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 <dhe...@gmail.com>
