Thank you all for your valuable input. i apologize for late reply. i ordered a copy of EN60950:2000. (thanks, Chris, George and constantin) and now, it is getting much clearer. however, i have some questions and would appreciate any comment.
as per EN60950:2000, 4.7.2.1: 1. Except where method 2 of 4.7.1 is used exclusively, or as permitted in 4.7.2.2, the following parts are considered to have a risk of ignition and, therefore, require a FIRE ENCLOSURE: - components in PRIMARY CIRCUITS; So if i am interpreting Rich and Scott's e-mail right (great explanation), i do not need FIRE ENCLOSURE, if primary circuit is supplied by a Limited Power source. For an existing device, how do i know whether the primary circuit is supplied by a Limited Power source? are cell-phones, PDA's typically supplied by Limited Power Source? as per 4.7.3.4 2. Inside FIRE ENCLOSURE, materials for components and other parts, (including MECHANICAL and ELECTRICAL ENCLOSURE located inside FIRE ENCLOSURS) shall comply with on of the following: - be of FLAMMABILITY CLASS V-2 OR FLAMMABILITY CLASS HF-2; OR - pass the flammability test described in clause A.2; or - meet flammability requirements of a relevant IEC component standard which includes such requirements. Does this mean; if i have an enclosure inside a FIRE ENCLOSURE, than it has to be V-2 eventhough there are no safety hazards resulting from complete disapperance of the enclosure? thank you. vijay wani ------------------------------------------- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com 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: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
