Looking for help here. The standard: UL 60065 7th Ed.
9.1.3 Openings of the enclosure (excerpted): The apparatus shall be so designed that suspended foreign bodies cannot become HAZARDOUS LIVE, when introduced through ventilation or other holes. Compliance is checked by applying to the holes a metal test pin having a diameter of 4 mm and a length of 100 mm. The test pin is suspended freely from one end, the penetration is limited to the length of the test pin. The test pin shall not become HAZARDOUS LIVE. Section 20.2 Fire Enclosure (excerpted): 20.2.1 Each of the following shall be contained in a FIRE ENCLOSURE: (1) circuits and their associated components where the available power exceeds 15 W, (2) inductors and windings CONDUCTIVELY CONNECTED TO THE MAINS, ... 20.2.2 Internal FIRE ENCLOSURES shall not have openings that permit accessibility to components, wiring, connections, or PRINTED BOARD conductive patterns where the AVAILABLE POWER exceeds 15 W and to inductors and windings CONDUCTIVELY CONNECTED TO THE MAINS ... Compliance is checked by inspection and measurement and using the jointed test finger. The test agency said: "The enclosure construction has openings under the power supply and amplifier circuitry. Such construction is not considered a suitable fire enclosure. In order to comply with UL 60065, these bottom openings must be removed." There are ventilation openings in both the top and bottom of the metal enclosure. The openings are about 4mm x 12mm rectangular. There are no internal fire enclosures. Assuming the test pin of 9.1.3 does not pass into the product, what in 20.2 would require smaller openings or no openings in the bottom cover below the PCB's? Thank you in advance for any and all comments. Scott Douglas - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
