Y2 caps are typically designed to meet the test level for BI where unit rated less than 300V input. Where the test level is intended to verify RI, or where an approved GDT or similar component is across an isolation boundary, the circuit is typically not installed in the end-use chassis until after the test, then the test for BI is performed. Y1 caps are rated for most RI-level tests.
If a Y- cap cannot withstand the hi-pot, then would question the design. X-caps should not be subject to these test levels, but should not be an issue as they are not rated for use where protection from shock required. There is no specific current limit for di-electric withstand, and all NRTLs that my employer uses "SUGGEST" that the current 'trip setting' level be adjustable for each product. The test can be dual purpose, in that the upper and lower current settings for test equipment will roughly verify the y-cap value. Testing of some telecom products can be different. Brian From: ce-test, qualified testing bv - Gert Gremmen [mailto:g.grem...@cetest.nl] Sent: Tuesday, June 02, 2015 11:57 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] leakage current tests >I can't provide a justification for not testing a radio interference filter >for both leakage current and electric strength. The filter is a leakage >current path and is subject to transient overvoltages. Because AC voltage electrical strength testing creates high leakage currents? And thus false fails. And because they have been built with approved components withstanding electrical strength tests ? (Y type capacitors for example) Gert Gremmen Van: Richard Nute [mailto:ri...@ieee.org] Verzonden: dinsdag 2 juni 2015 0:17 Aan: EMC-PSTC@LISTSERV.IEEE.ORG Onderwerp: Re: [PSES] leakage current tests Hi Ralph: The "protective impedance" leakage current is separately measured (8.1.4). The "protective impedance" is connected between a live part and an accessible conductive part, not to earth. "Leakage current" and electric strength is measured from each pole of the supply across basic insulation (Table 4) to an accessible conductive part, not necessarily through a "protective impedance" (13.2). The "protective impedance" is only subject to transient overvoltages when the accessible conductive part is touched, otherwise it is an open circuit and there is no voltage drop across it. I suppose this is the reason for not subjecting the "protective impedance" to the dielectric test. (If the part is touched at the same time as a transient overvoltage, an electric shock injury is not likely because transient overvoltages are of very short duration.) I can't provide a justification for not testing a radio interference filter for both leakage current and electric strength. The filter is a leakage current path and is subject to transient overvoltages. Best regards, Rich From: McDiarmid, Ralph [mailto:ralph.mcdiar...@schneider-electric.com] Sent: Monday, June 01, 2015 12:30 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] leakage current tests IEC 60335-1 13 Leakage current and electric strength at operating temperature Protective Impedance and radio interference filters are to be disconnected before carrying out the tests. I suppose they are merely checking for an obvious no-no, like using accessible chassis metalwork as a current carrying conductor. However, don't radio frequency interference filters often have capacitors which use a metal enclosure as a common connection point? _______________________________________________________________________________ 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>
