Mike, The global safety standards for ITE require an electric strength test per section 5.3. This applies to the entire assembly as certilisted. Section 5.3.2 describes the "type" test necessary for certification. IEC 60950, nor its counterparts, explicitly state that production hi- pot testing must be conducted, but the section does include a note that "for production test purposes" the duration of the test can be reduced to 1 sec.
However, I believe that any agency, especially those with mandatory follow-up-services, will require production hi-pot testing to approve an ITE product. This is usually the most scrutinized process step for any initial factory inspection, even by China's CCIB or Poland's PCBC. Suppose an ITE product contains multiple sub-assemblies which include mains voltages or higher, e.g. power supply, fuser, CRT, etc. Suppose each is an agency recognized or listed component, and undergo a hi-pot check at their site of manufacture. Why hi-pot a product comprised of theses sub-asseblies? The reasons are many. The sub-assemblies can be damaged in shipment. During final product assembly, a nut or screw can fall into a power supply or other sub-assemly. All mains cabling and connections between the separate assemblies must be verified to pass hi-pot. Hope this helps. George ---------------------- Forwarded by George Alspaugh/Lex/Lexmark on 09/01/2000 12:10 PM --------------------------- mikem%[email protected] on 08/31/2000 01:40:27 PM Please respond to mikem%[email protected] To: emc-pstc%[email protected] cc: (bcc: George Alspaugh/Lex/Lexmark) Subject: Why routine hipot is required. I've been asked why a routine hipot test is required on an end assembly computer when it uses a Listed power supply that has already been hipot tested. So far I don't like the way I've worded my response. Basically what I've said is that a power supply is approved as a component. The end safety of the device depends on the installation. Can anyone add some more beef to this statement. Thanks. Mike Morrow Senior Compliance Engineer Ucentric Systems 978-897-6482 [email protected] www.ucentric.com ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
