I assume the relay would have to meet double/reinforced open contact spacing and dielectric strength in this application. Correct?
Sounds right We are having a hard time finding a relay that specifies an open contact dielectric strength for double/reinforced (3000Vac or 4200Vdc). How about two Listed relays in series, each with independent coil drive? (single fault tolerance) We have found a relay where the manufacturer specifies an open contact dielectric strength of 2000Vac but internally each pole has two contacts with an air gap of 1.8mm for each. Since there are two air gaps, each meeting the requirements of Basic, together, the open contact has a combined spacing and passes a hipot test exceeding the requirements for double/reinforced. Can the relay remain closed in a single fault scenario? So can we use this part in our application based on our testing and physical measurements or are we limited to the manufacture's specification? I'd use two Listed/Certified relays and then I'd analyze full circuit with FMEA and do a fault tree. (above and beyond whatever tests the NRTL need done) _______________________________________________________________________________ Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering - ---------------------------------------------------------------- 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>
