Sorry, typo should be IEC 60664-1. Doug
On Mon, Nov 25, 2019 at 9:07 AM Doug Powell <[email protected]> wrote: > BOštjan > > In the past when I've had to deal with this, I explained to the safety > inspector that internal spacings (clearance and creepage) are not > applicable. Nearly all IEC based standards use IEC 60644-1 as the basis of > their spacings determination. Since there is no atmosphere inside a vacuum > relay, things like pollution degree do not apply, additionally you can > invoke the Paschen's Law for voltage standoff capability, which is very > high for a deep vacuum. I have achieved 30 kV with just few millimeters. > Of course, nearly all vacuum HV relays use shaped electrodes for homogenous > e-field control. > > That said, normal spacings concern still apply to the exterior surfaces of > the relay. Since most of these are made of glass-like materials or > ceramics you can claim CTI I for the material class. > > Best fo luck, doug > > -- > Douglas E Powell > [email protected] > https://www.linkedin.com/in/dougp01 > > Currently working from my Android phone > *From:* [email protected] > *Sent:* November 25, 2019 8:22 AM > *To:* [email protected] > *Reply-to:* [email protected] > *Subject:* [PSES] HV relay > > Dear experts, > > > > Is anyone familiar with requirements for HV relay in vacuum? Are > clearances and creepage distances between contacts applicable for such > relay? > > > > Thank you for your support. > > > > Best regards, > > BOštjan > - > ---------------------------------------------------------------- > > 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 < > [email protected]> > > 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 <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher <[email protected]> > David Heald <[email protected]> > -- Douglas E Powell [email protected] http://www.linkedin.com/in/dougp01 - ---------------------------------------------------------------- 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
