Hi Ken, UL1012 has the same limitation as 60950-1.
IEC 61010-1 is not OK since it is not a laboratory equipment or measuring equipment. IEC 62477-1 has also limitation in the scope however limits are 1000Vac and 1500VDC. Best regards, Bostjan From: IBM Ken [mailto:ibm...@gmail.com] Sent: Wednesday, September 21, 2016 6:36 AM To: Boštjan Glavič <bostjan.gla...@siq.si> Cc: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] standard for power suply for server room. Hi Bostjan! You might be able to use 60950 or (UL1012?) anyway; I know the scope says "Mains or Battery powered up to 600V", but I think the focus of that limit (vs the 1000V limit in the LVD for example) might be on just Mains powered circuits, because 600V is the delineation point between "Low Voltage" and "high voltage" per the National Electrical Code. On the other hand, I believe the spacing calculations go higher than 600V in 60950 because internal voltages can go much higher than the supply voltage (boost stages in a SMPS, inverters for CCFL tubes, HV supply for corona wire in a laser printer, TV flyback, etc). Would 61010 work? -Ken A On Wed, Sep 21, 2016 at 12:09 AM, Boštjan Glavič <bostjan.gla...@siq.si<mailto:bostjan.gla...@siq.si>> wrote: Dear experts I again need your opinion on below issue. Customer was asked for development of power supply which will be used to supply a server in data centre. Input to power supply is defined as 750VDC. Unfortunately no information is available how this DC supply voltage is generated and reference to PE. Most probably it will be floating. Now the problem, what standard to use for such product? - Standard IEC 60950-1 which is most often used is limited to 600V rated voltage. Does it mean 600VRMS? Is it then allowed to approve also products with 600xsqrt(2)=848VDC rated voltage according IEC 60950-1 or limit is also set to 600VDC? Where this limit actually comes from? If you check requirements for clearance and creepage distance they go quite higher than 600V. - Standard IEC 62477-1 could be appropriate standard however problem is that this standard is not worldwide harmonised and therefore no national certificates (US/CAN, China) are possible based on report according to this standard - What other standard would be OK for US/CAN? I appreciate your feedback. Best regards, Bostjan - ---------------------------------------------------------------- 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<mailto:emc-p...@ieee.org>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org<mailto:sdoug...@ieee.org>> Mike Cantwell <mcantw...@ieee.org<mailto:mcantw...@ieee.org>> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org<mailto:j.bac...@ieee.org>> David Heald <dhe...@gmail.com<mailto: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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>