Hi Bruce, Your customer is correct. If the device is classified as a Class A (according to CISPR 11), you do not need to comply with flicker requirements.
Jim Jim Conrad P.O. Box 25 Hamilton, MA 01936-0025 USA [email protected] Phone #: 978-468-3909 FAX #: 978-468-3909 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Sunday, December 03, 2000 6:04 PM To: [email protected] Subject: EN 61000-3-3 Flicker Tests Hello group! I've got a customer in our EMC lab that makes a laboratory instrument incorporating heaters with a typical 3-4 amp input current at 230vac. He is failing the flicker test due to the design of the heater control. They are undertaking a redesign but would like to keep selling product in the interim. They have come up with an interesting interpretation of the scope of EN 61000-3-3: the standard specifies that the tests are applicable to products connected to the "public low voltage distribution systems" but if you take a typical industrial location or even a typical commercial location, isn't it true that these locations are fed by a dedicated transformer at the building that isolates them from the public network? I guess the question becomes - what is considered the public network? What if the marketing of the product was restricted to "industrial" locations? My initial reaction to the question was that anyplace you can plug or wire into at typical 230vac is considered the "public network", especially considering the mixed residential / commercial buildings common in Europe. Anyone care to comment? Bruce Fagley Sr. Specialist, EMC Industrial Products TUV Rheinland 12 Commerce Rd. Newtown CT. 06470 203-426-0888 ext 119 203-426-4009 fax ------------------------------------------- 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]
