Dear Boštjan:
As you know, a relay, including a vacuum relay, has two circuits. One is the coil that controls the contacts. The other is the contacts. Usually, these are separate circuits. If the one of the circuits provides a safeguard function, then the two circuits must meet clearance and creepage requirements so as not to compromise the safeguard insulation. Usually, the open contacts do not provide a safeguard insulation (functional only), hence, no safeguard clearance or creepage requirements apply to the open contacts. Some interpretations or applications, e.g., power disconnect, may apply clearance and creepage to the open contacts. Best regards, Rich From: Boštjan Glavič <[email protected]> Sent: Monday, November 25, 2019 7:22 AM 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) 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]>
