Constantine, you are on track. The test is just a 500VDC hipot and you have to measure the resistance(older style Hipot testers have this built in) If you don't have insulation, of course you can measure current and using our friend Mr. Ohm easily calculte resistance Test is Primary to Ground 2 MOhms min. Primary to secondary 4 MOhms min. An important side note. In Japan they actually do this test on Building wiring and most of the time they don't disconnect equipment so if you have a voltage suppresor rated less than 385V AC someone will think your product fails(There is no rule against MOVs in Japan it just means you have some expaining to do as the people doing the test don't remove parts. The critical thing is that when testing for CB scheme or Dentori rules, the MOV can be lifted) Also, be aware that this test is being performed in France(NFS 100.15) MOV's aren't an issue as EU requires a 1.5KV(or 2.5KV depending on you talk to) spark gap, but switching power supplies that use creative sense circuitry and bridge double or reinforced insulation with resistors, fail this. Again this happens because the people perfoming the test on the building do not remove equipment. Legally, they can't remove your equipment, BUT, it creates a very negative perception of you device. There is actually a company that manufacturs equipment specifically for France so that people can do this test and the companies brocures make scary claims like"needed for mandatory testing per NFS100.15" Of course they forget to tell you to remove devices connected to the wiring under test. The opinions expressed are my own and not necessarily those of my employer.
Please respond to Constantin Bolintineanu <bolin...@dscltd.com> To: "'Ehler, Kyle'" <kyle.eh...@lsil.com>, emc-p...@majordomo.ieee.org cc: (bcc: Steve Williams/SDD/NAM/APCC) From: Constantin Bolintineanu <bolin...@dscltd.com> on 09/10/99 03:45 PM Subject: RE: Insulation resistance Dear Kyle, I suppose that here is not in discussion the INSULATION RESISTANCE, I think (as far as I know, Clause 16 from "IEC335-1, Safety of household and similar electrical appliances, Part 1: General requirements", deals with the ELECTRIC STRENGTH and LEAKAGE CURRENT...) The Table 5 of the Standard IEC335-1 gives the values of the TEST VOLTAGE and the POINT OF APPLICATION. Compared with IEC 950, within IEC335-1 you may find the fact that the required TEST VOLTAGE is higher than within IEC950 [e.g. between LIVE parts and ACCESSIBLE PARTS IEC 335-1 is asking for 3750Vac/1min and IEC950(IEC60950) is asking only for 3000Vac/1min...I suppose that here was the difference and ...the failure... Unfortunately I was not able to find the Clause 5.3.101 within the copy which I have...and as well I did not find the Japanese deviations neither under the country notes, nor under the legal requirements... Respectfully yours, Constantin The opinions expressed are my own and not necessarily those of my employer. Constantin Bolintineanu, P.Eng. Product Safety Engineer DIGITAL SECURITY CONTROLS LTD. 1645 FLINT Rd. TORONTO , ONTARIO, CANADA M3J 2J6 Phone: 1-416-665-8460 extension 2568 Fax: 1-416-665-7753 APPROVAL SERVICES E-mail: bolin...@dscltd.com -----Original Message----- From: Ehler, Kyle [mailto:kyle.eh...@lsil.com] Sent: Friday, September 10, 1999 11:49 AM To: emc-p...@majordomo.ieee.org Subject: Insulation resistance I just received an amended CB report for a product we make and I was reviewing it and see that a 'fail' verdict was given for a deviation + test in Sub-Clause 5.3.101 of the Japanese deviation to IEC 950. A remark of "Not evaluated as part of this investigation" also appears. The text of the Deviation + Test reads: "Add: The insulation resistance shall comply with the requirements of Clauses 16.3 of IEC Publication 335-1 (1976) Second Edition." I use UL1950 2nd and 3Rd ed. and I cannot find this 5.3.101 reference in the latest copy of the standard, much less IEC Pub 335-1. If a customer put me on the spot for this, I might need to test for it... Can someone educate me on this? Thank You. Kyle Ehler kyle.eh...@lsil.com <mailto:kyle.eh...@lsil.com> Assistant Design Engineer LSI Logic Corporation --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
