Hi Boštjan, I've worked with this type of relay in the past. Distance between contacts in the vacuum is unlikely to meet standard clearance requirements if you are relying on the contact gap for safety isolation. Presumably the reason for the vacuum in the first place is to provide very low pressure in order to take advantage of the low end of Paschen's curve (see Paschen's law <https://en.wikipedia.org/wiki/Paschen%27s_law> from Wikipedia), so smaller clearances can be used without breakdown.
IEC 62368-1, Annex K (for safety interlocks) has some requirements that might be useful, but the 3rd edition is clearer than 2nd. See K.7.1 from 3rd edition. There is an allowance for the contact gap to be evaluated by electric strength test rather than the separation requirements outlined in a), b) or c), as well as some other clauses that must be applied including endurance test. Note that reed switches tend to fail closed as the contacts can stick, so some type of periodic functional check or other detection method is advisable. Also, the standard doesn't address reliability of the vacuum integrity over the life of the relay other than by application of the endurance test. On Mon, Nov 25, 2019 at 7:22 AM Boštjan Glavič <[email protected]> wrote: > 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]> > -- Scott Aldous | Regulatory Compliance Program Manager | [email protected] | 650-253-1994 - ---------------------------------------------------------------- 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]>
