I have worked with H.V. power supplies in the past, and there is a point where IEC-based standards simply run out.
In most cases, I found certifying agencies are accepting of IEC 61010-1 (or national derivatives) using the tables in Annex K (2010 edition). You still need to pay attention to the mains voltage, but in your case I believe the spacings you need are all secondary circuits. Starting at Table K.10 and following. In there you will find clearance and creepage requirements up to 63 kV. This will apply to steady state voltages as well as calculations for plasma strike voltages, in the standard referred to as temporary overvoltages or repetitive peaks. Above 63 kV, I found some agencies I worked with were willing to accept an engineering rationale using classical HV e-field evaluation for uniform fields around geometric structures for clearances; and a linear extrapolation for creepage, up to as high as 200 kV. Of course, creepage can never be less than clearance in your results. And you must pay close attention to electrode shaping, CTI, Pollution Degree, altitude, etc. I also found it very helpful to study parts of the IEC 60664-X standards. There is a wealth of information there. The considerations for solid insulation are very different, and the old rule of thumb using 0.4mm thickness for everything is no where close to accurate. Let's just say that small thicknesses like that are almost useless after a point, and especially when the solid insulation is adjacent to an air gap, which essentially forms a multiple dielectric capacitor. As it turns out, almost 100% of the voltage distributed across the dielectric stack up is impressed almost entirely on the air layer, as opposed to that of the solid insulation layer. Best of luck, -Doug Douglas E Powell Laporte, Colorado USA doug...@gmail.com LinkedIn <https://www.linkedin.com/in/coloradocomplianceguy/> (UTC -06:00) Mountain Time (US-MDT) On Thu, Aug 18, 2022 at 1:43 PM <bart.de.gee...@telenet.be> wrote: > Dear experts, > > > > A client is looking for regulatory guidance to CE certify a high voltage > output supply (with regular AC mains 230V/50Hz input). > > The supply has an output voltage upto 25kV (upto 50kHz) output. It > concerns a supply to be used for plasma reactor applications. > > > > As the output voltage is not inside the voltage limits for the Low > Voltage Directive, the LVD directive is not applicable? > > The Machine Directive also excludes these high voltage products. > > > > So, wondering which Directive to apply related tot he safety testing > part. (The General Safety Product Directive?) > > Any suggestions as to which safety standard to apply for such products? > > > > Any suggestions are highly appreciated. > > > > Thanks ! > - > ---------------------------------------------------------------- > > 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 > > 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: > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > ------------------------------ > > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > - ---------------------------------------------------------------- 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 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: Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
