Hi John:
Depends on what limits are set for insulation resistance and electric strength current. For example, assume the insulation resistance limit is 100 megohms and the measured insulation resistance is 10 megohms. Failure. If the electric strength test is 3,000 volts, the current is 3,000/10,000,000 or 0.3 mA. If the current limit of the electric strength test is greater than 0.3 mA, then pass. Likewise, assume the insulation resistance is 100 megohms. Pass. If a clearance (air insulation) is less than 0.5 mm, the clearance will break down at less than 3,000 volts. Failure. (The insulation resistance test measures only solid insulation.) Best regards, Rich From: John Woodgate [mailto:j...@woodjohn.uk] Sent: Monday, February 19, 2018 2:19 PM To: ri...@ieee.org; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Insulation resistance test Hello, Rich. This puzzles me: Or, it can fail the insulation resistance measurement yet pass the dielectric strength measurement. how can that happen? John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk> Rayleigh, Essex UK On 2018-02-19 21:53, Richard Nute wrote: Or, it can fail the insulation resistance measurement yet pass the dielectric strength measurement. - ---------------------------------------------------------------- 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>
