Good People, Investigating (for me) new territory.
Customer requires Class II unit, but with a metal base plate. Target standards for the end-use device are UL/EN60950-1 and UL 1310. I am not certain if I can allow vent holes under the PCB traces of a circuit at hazardous and mains voltage levels. According to 4.6, I can allow openings in the enclosure if the hole is less than a specified diameter (table 4D), and if the spacing from the opening to the 'exposed' haz V is > 13mm (4.6.4.2), and if for any fault condition that no ejecta creates a fire hazard. Other that the generic requirements of 2.9.4, nothing else can be found. But, I seem to remember a requirement that there can be no opening (period) that is directly beneath a haz V for a Class II device (because a short to the chassis will not conduct to protective earth). Can someone please advise on the requirements for vent holes in Class II construction ? Thanks much. luck, Brian - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
