I read in !emc-pstc that marti...@appliedbiosystems.com wrote (in <of6ced213d.bf9618d9-on88256b57.00806...@pe-c.com>) about 'Compliance After Repairs in the Field', on Tue, 5 Feb 2002: >We are a manufacturer of Laboratory Equipment. We evaluate our products to >UL 3101-1, CSA 1010.0 and EN 61010. When we repair a product in the field, >which may include replacing power supplies, line filters, etc., what >obligations do we have to verify continuing compliance with the safety >specifications we originally evaluated our products against? Do we need to >perform applicable safety testing following these repairs?
Your repair technicians should have been trained to know WHEN a new safety test is required after a repair. Basically, if a safety-critical component (except a fuse) has been replaced or removed and replaced, a new test is necessary. This normally comprises: -internal visual inspection of position and securing of wiring, damaged or overheated components, missing fasteners, contamination of insulation; - external visual inspection of enclosure fixings, labelling, mains lead and connectors, other cables if safety is involved; - earth/ground continuity test at specified current (Class I products); - insulation resistance at specified voltage; - leakage current (if required by the safety standard) at specified voltage; - dielectric strength test; ONLY if a safety-critical component that is stressed by this test has been replaced. The dielectric strength test ('hi-pot') must not be applied unnecessarily because repeated applications can degrade insulation and result in failure in service. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. PLEASE do NOT copy news posts to me by E-MAIL! ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.