Hi Terry, Sounds like a discussion with your agency safety engineer might be in order. It's certain there's a line of reasoning behind the "new" approach taken by the agency, that you've described below. Question is, since the standard clauses you've called out make certain allowances, the real issue might easily be addressed by asking "what's the safety concern"? If the agency rep. understands your product, your reasoning and it all falls into an area of interpretation without any blatant standard violations, a certain amount of engineering judgment might help resolve the situation.
My opinion only and not that of my employer. Good Luck. Regards, Kaz Gawrzyjal kazimier_gawrzy...@dell.com -----Original Message----- From: Terry Meck [mailto:tjm...@accusort.com] Sent: Tuesday, February 20, 2001 9:44 AM To: emc-p...@ieee.org Subject: FLAME RATING OF STANDOFFS Hi group! I need a sanity check on a `new approach' our safety agency has recently taken. We have an open frame power supply ( has all the certs through the CB report etc. for EN 60950 UL 1950 ) On of the conditions of acceptability is one mounting standoff shall be insulated. We have this supply in no less then 4 listed products without any reference to the flame rating of the standoff having to be checked when the inspector comes in. I consider that to be reasonable. section 4.4.3.3 UL 1950 has exception: "gears, cams, belts, bearings and other small parts which would contribute negligible fuel to a fire;" Recently new products have been reviewed and the new procedures require `traceable 94V-2' standoffs!?!? Which manufacturing engineering says is difficult to procure a traceable recognized plastic standoff. Questions: Has my fever and pneumonia the past weeks clouded my reasoning? What am I missing? You place a .5 inch #6 standoff between a V-0 board and a medal chassis what requires a recognized part except maybe `straining out the gnats so we can swallow the camel' somewhere else. Sick and Tired Terry J. Meck Senior Compliance / Test Engineer Accu-Sort Systems ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
