Mike: Here's the beef.
The hi-pot test on the completed assembly, or final product, should be done as close as possible to the point of production where the product is boxed up for shipping and/or storage. The purpose of this is to try and find a defect in the primary side of the product wiring that may have been induced as part of the assembly process, such as a cable being pinched where the insulation is now broken. Even if the component power supply you are installing in your product is Listed (most are Recognized), there may be an instance where someone on the production line had too much weekend and wired something incorrectly (such as the input to the supply). In my days of working for a computer manufacturer, I can recall a specific instance where a "listed" molded cordset had ground and line reversed on one end. What a happy surprise for the test operator that was. Bottom line is that the production hi-pot test is the last line of defense in assuring that the manufacturer is not sending out a liability inducing, honey, we just lost the farm death trap. Sincerely, Robert Loop Engineering Supervisor Wyle Laboratories Product Safety ph - (256) 837-4411 x313 fax- (256) 721-0144 e-mail: [email protected] ______________________________Reply Separator________________________________________ > ---------- > From: Mike Morrow[SMTP:[email protected]] > Reply To: Mike Morrow > Sent: Thursday, August 31, 2000 12:40 PM > To: EMC Society > 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]
