Thanks to all who responded to my UL1950 desparate cry for help regarding interpretation of the clauses under 4.4.
To summarize : (Rich) : Sub-clauses 4.4.3.2 through 4.4.3.6 are specific requirements for parts inside a fire enclosure, invoked by the compliance statement of 4.4.3.1. (Sub-clauses 4.4.3.2 through 4.4.3.6 do not have individual compliance statements; therefore, the sub-clauses define requirements for compliance to 4.4.3.1!) - Everybody agreed with this interpretation (except for the test house ! ). (Kaz) Is it possible that the exemptions under 1950, 3rd, cl. 4.4.3.2 .....7th hyphenated item dealing with abnormal testing per 5.4.6 to prove in no issues could be applied? - Sorry Kaz, 5.4.6 applies to electrical components, not foam. Good try though. (George) "box within a box" - good logic. It is actually a "box connected to a box" - the LPS sources are extenal to this enclosure. Several folks mentioned the "small parts" criteria - unfortunately it wasn't THAT small..... And finally, thanks to Rich again for putting it so succinctly...... "Remember, you ALWAYS have the alternative of testing!" Incidentally, the agency allowed it under engineering judgement, pending verification of LPS power sources..... (Insert iron-clad disclaimer here that excuses my employer from any liability now and forever due to my personal opinions) Doug Massey Safety Approvals Engineer LXE, Inc. Norcross, GA., USA Ph. (770) 447-4224 x3607 FAX (770) 447-6928 e-mail: masse...@lxe.com Cruise our website at: http:\\www.lxe.com ------------------------------------------- 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